TY  - JOUR
AU  - Tadić, Marin
AU  - Panjan, Matjaž
AU  - Čekada, Miha
AU  - Jagličić, Zvonko
AU  - Pregelj, Matej
AU  - Spreitzer, Matjaž
AU  - Panjan, Peter
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12839
AB  - In the literature, a magnetic “easy” axis perpendicular to the film plane at room temperature (i.e., perpendicular magnetic anisotropy - PMA) has been reported in Ni (nickel) layers with thicknesses below ≈15 nm. In this work, we observed room-temperature PMA in a-Si/Ni/a-Si (where a-Si denotes amorphous silicon) thin film structures with nickel layer thicker than 15 nm. Two layered structures were prepared by DC/RF triode sputtering: [a-Si/Ni/a-Si] sandwich structure and [a-Si/Ni/a-Si]5 multilayer structure. The cross sectional STEM revealed uniform Ni layers with thicknesses of ≈17 nm in [a-Si/Ni/a-Si]5 – multilayer and ≈28 nm in [a-Si/Ni/a-Si] – single-layer whereas amorphous Si layers were ≈15 nm and 170 nm thick, respectively. An amorphous Ni–Si interphase was also observed in the layered structures. The XRD showed patterns for fcc-Ni with dominant (111) orientation. No other crystalline phases were observed in the XRD patterns. To our knowledge, there are no literature reports of easy magnetization direction perpendicular to the film plane at room temperature for Ni layers with thickness of ≈28 nm as presented in this work. The origin of PMA in a-Si/Ni/a-Si films may be mainly attributed to the magnetoelastic anisotropy whereas the secondary source of PMA is believed to be the surface anisotropy and magnetocrystalline anisotropy of [111] columnar grains. Amorphous silicon layers (substrate) do not have a well-defined lattice structure like crystalline substrates. Therefore, they do not induce strains in the nickel layers through lattice mismatch as in the case of epitaxy. The strains can be caused by other factors such as diffusion-induced strain, thermal expansion mismatch or intrinsic stresses during the growth process. These results could be important for applications in memory devices, sensors, logic chips, magneto-optic, magneto-electronic and spintronic devices and in fundamental research, as well as first step toward preparation and understanding of the PMA in thick nickel layers.
T2  - Ceramics International
T1  - Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers
VL  - 49
IS  - 19
SP  - 32068
EP  - 32077
DO  - 10.1016/j.ceramint.2023.07.174
ER  - 

@article{
author = "Tadić, Marin and Panjan, Matjaž and Čekada, Miha and Jagličić, Zvonko and Pregelj, Matej and Spreitzer, Matjaž and Panjan, Peter",
year = "2023",
abstract = "In the literature, a magnetic “easy” axis perpendicular to the film plane at room temperature (i.e., perpendicular magnetic anisotropy - PMA) has been reported in Ni (nickel) layers with thicknesses below ≈15 nm. In this work, we observed room-temperature PMA in a-Si/Ni/a-Si (where a-Si denotes amorphous silicon) thin film structures with nickel layer thicker than 15 nm. Two layered structures were prepared by DC/RF triode sputtering: [a-Si/Ni/a-Si] sandwich structure and [a-Si/Ni/a-Si]5 multilayer structure. The cross sectional STEM revealed uniform Ni layers with thicknesses of ≈17 nm in [a-Si/Ni/a-Si]5 – multilayer and ≈28 nm in [a-Si/Ni/a-Si] – single-layer whereas amorphous Si layers were ≈15 nm and 170 nm thick, respectively. An amorphous Ni–Si interphase was also observed in the layered structures. The XRD showed patterns for fcc-Ni with dominant (111) orientation. No other crystalline phases were observed in the XRD patterns. To our knowledge, there are no literature reports of easy magnetization direction perpendicular to the film plane at room temperature for Ni layers with thickness of ≈28 nm as presented in this work. The origin of PMA in a-Si/Ni/a-Si films may be mainly attributed to the magnetoelastic anisotropy whereas the secondary source of PMA is believed to be the surface anisotropy and magnetocrystalline anisotropy of [111] columnar grains. Amorphous silicon layers (substrate) do not have a well-defined lattice structure like crystalline substrates. Therefore, they do not induce strains in the nickel layers through lattice mismatch as in the case of epitaxy. The strains can be caused by other factors such as diffusion-induced strain, thermal expansion mismatch or intrinsic stresses during the growth process. These results could be important for applications in memory devices, sensors, logic chips, magneto-optic, magneto-electronic and spintronic devices and in fundamental research, as well as first step toward preparation and understanding of the PMA in thick nickel layers.",
journal = "Ceramics International",
title = "Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers",
volume = "49",
number = "19",
pages = "32068-32077",
doi = "10.1016/j.ceramint.2023.07.174"
}

Tadić, M., Panjan, M., Čekada, M., Jagličić, Z., Pregelj, M., Spreitzer, M.,& Panjan, P.. (2023). Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers. in Ceramics International, 49(19), 32068-32077.
https://doi.org/10.1016/j.ceramint.2023.07.174

Tadić M, Panjan M, Čekada M, Jagličić Z, Pregelj M, Spreitzer M, Panjan P. Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers. in Ceramics International. 2023;49(19):32068-32077.
doi:10.1016/j.ceramint.2023.07.174 .

Tadić, Marin, Panjan, Matjaž, Čekada, Miha, Jagličić, Zvonko, Pregelj, Matej, Spreitzer, Matjaž, Panjan, Peter, "Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers" in Ceramics International, 49, no. 19 (2023):32068-32077,
https://doi.org/10.1016/j.ceramint.2023.07.174 . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Branković, Dušan
AU  - Milivojević, Dušan
AU  - Jagličić, Zvonko
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9646
AB  - Nanocomposites made of magnetic spinel oxide Co1+yAl2-yO4 nanoparticles (NPs) with y = 0.93, 1.20 and 1.34 dispersed in an amorphous SiO2 matrix were prepared by a sol-gel method. The average crystallite size DXRD of about 25 nm determined by X-ray diffraction (XRD) agrees well with the average particle size observed in transmission electron microscopy (TEM). Dynamic magnetic susceptibility measurements indicate a spin-glass-like behavior of the nanoparticles below the spin-glass (SG) transition temperature TC < 10 K. Field dependent magnetization exhibits weak ferromagnetism and shift of the magnetic hysteresis loop. On the basis of the observed magnetic properties, we propose a model of the core-shell structure of the Co1+yAl2-yO4 nanoparticles with the spin-glass phase in the core and weak ferromagnetism in the shell. The exchange bias field disappears above the spin-glass transition temperature TC, whereas the weak ferromagnetism persists also at temperatures above TC. The component of weak ferromagnetism is associated with the presence of Co vacancies in the nanoparticle spinel crystal lattice.
T2  - Journal of Alloys and Compounds
T1  - Weak ferromagnetism and exchange bias effect in Co1+yAl2-yO4/SiO2 nanocomposites
VL  - 853
SP  - 155933
DO  - 10.1016/j.jallcom.2020.155933
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Branković, Dušan and Milivojević, Dušan and Jagličić, Zvonko",
year = "2021",
abstract = "Nanocomposites made of magnetic spinel oxide Co1+yAl2-yO4 nanoparticles (NPs) with y = 0.93, 1.20 and 1.34 dispersed in an amorphous SiO2 matrix were prepared by a sol-gel method. The average crystallite size DXRD of about 25 nm determined by X-ray diffraction (XRD) agrees well with the average particle size observed in transmission electron microscopy (TEM). Dynamic magnetic susceptibility measurements indicate a spin-glass-like behavior of the nanoparticles below the spin-glass (SG) transition temperature TC < 10 K. Field dependent magnetization exhibits weak ferromagnetism and shift of the magnetic hysteresis loop. On the basis of the observed magnetic properties, we propose a model of the core-shell structure of the Co1+yAl2-yO4 nanoparticles with the spin-glass phase in the core and weak ferromagnetism in the shell. The exchange bias field disappears above the spin-glass transition temperature TC, whereas the weak ferromagnetism persists also at temperatures above TC. The component of weak ferromagnetism is associated with the presence of Co vacancies in the nanoparticle spinel crystal lattice.",
journal = "Journal of Alloys and Compounds",
title = "Weak ferromagnetism and exchange bias effect in Co1+yAl2-yO4/SiO2 nanocomposites",
volume = "853",
pages = "155933",
doi = "10.1016/j.jallcom.2020.155933"
}

Babić-Stojić, B. S., Branković, D., Milivojević, D.,& Jagličić, Z.. (2021). Weak ferromagnetism and exchange bias effect in Co1+yAl2-yO4/SiO2 nanocomposites. in Journal of Alloys and Compounds, 853, 155933.
https://doi.org/10.1016/j.jallcom.2020.155933

Babić-Stojić BS, Branković D, Milivojević D, Jagličić Z. Weak ferromagnetism and exchange bias effect in Co1+yAl2-yO4/SiO2 nanocomposites. in Journal of Alloys and Compounds. 2021;853:155933.
doi:10.1016/j.jallcom.2020.155933 .

Babić-Stojić, Branka S., Branković, Dušan, Milivojević, Dušan, Jagličić, Zvonko, "Weak ferromagnetism and exchange bias effect in Co1+yAl2-yO4/SiO2 nanocomposites" in Journal of Alloys and Compounds, 853 (2021):155933,
https://doi.org/10.1016/j.jallcom.2020.155933 . .

TY  - JOUR
AU  - Perović, Marija M.
AU  - Bošković, Marko
AU  - Kusigerski, Vladan
AU  - Jagličić, Zvonko
AU  - Blanuša, Jovan
AU  - Spasojević, Vojislav
AU  - Pizurova, Nadežda
AU  - Schneeweiss, Oldřich B.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9674
AB  - Nanoparticle materials have become a promising candidate for a new kind of storage media based on thermally induced memory effects due to the possibility to tailor their magnetic properties and behaviour. In this study, we have investigated whether the magnetic memory effects could appear at high, industry accessible temperatures including the possibility of thermal data inscription. Investigated iron oxide nanoparticles were synthesized by poliol method, which has been modified in order to allow control of particle agglomeration and consequently magnetic properties. Structure, morphology and the degree of nanoparticle agglomeration were studied by X-Ray diffraction, Transmission Electron Microscopy and Dynamic Light Scattering techniques, while magnetic properties as well as memory effects were measured on a commercial SQUID-based magnetometer. Results of the study confirmed that in super spin glass magnetite nanoparticles, magnetic memory effects can be observed up to 200 K which represents much higher temperatures in comparison to those achieved in spin glasses and other glassy materials. Procedures of writing and reading (inscribing and retrieving) of digital information in such a material were demonstrated and discussed in details.
T2  - Journal of Alloys and Compounds
T1  - Search for high temperature memory effects in magnetic nanoparticles
VL  - 855
SP  - 157523
DO  - 10.1016/j.jallcom.2020.157523
ER  - 

@article{
author = "Perović, Marija M. and Bošković, Marko and Kusigerski, Vladan and Jagličić, Zvonko and Blanuša, Jovan and Spasojević, Vojislav and Pizurova, Nadežda and Schneeweiss, Oldřich B.",
year = "2021",
abstract = "Nanoparticle materials have become a promising candidate for a new kind of storage media based on thermally induced memory effects due to the possibility to tailor their magnetic properties and behaviour. In this study, we have investigated whether the magnetic memory effects could appear at high, industry accessible temperatures including the possibility of thermal data inscription. Investigated iron oxide nanoparticles were synthesized by poliol method, which has been modified in order to allow control of particle agglomeration and consequently magnetic properties. Structure, morphology and the degree of nanoparticle agglomeration were studied by X-Ray diffraction, Transmission Electron Microscopy and Dynamic Light Scattering techniques, while magnetic properties as well as memory effects were measured on a commercial SQUID-based magnetometer. Results of the study confirmed that in super spin glass magnetite nanoparticles, magnetic memory effects can be observed up to 200 K which represents much higher temperatures in comparison to those achieved in spin glasses and other glassy materials. Procedures of writing and reading (inscribing and retrieving) of digital information in such a material were demonstrated and discussed in details.",
journal = "Journal of Alloys and Compounds",
title = "Search for high temperature memory effects in magnetic nanoparticles",
volume = "855",
pages = "157523",
doi = "10.1016/j.jallcom.2020.157523"
}

Perović, M. M., Bošković, M., Kusigerski, V., Jagličić, Z., Blanuša, J., Spasojević, V., Pizurova, N.,& Schneeweiss, O. B.. (2021). Search for high temperature memory effects in magnetic nanoparticles. in Journal of Alloys and Compounds, 855, 157523.
https://doi.org/10.1016/j.jallcom.2020.157523

Perović MM, Bošković M, Kusigerski V, Jagličić Z, Blanuša J, Spasojević V, Pizurova N, Schneeweiss OB. Search for high temperature memory effects in magnetic nanoparticles. in Journal of Alloys and Compounds. 2021;855:157523.
doi:10.1016/j.jallcom.2020.157523 .

Perović, Marija M., Bošković, Marko, Kusigerski, Vladan, Jagličić, Zvonko, Blanuša, Jovan, Spasojević, Vojislav, Pizurova, Nadežda, Schneeweiss, Oldřich B., "Search for high temperature memory effects in magnetic nanoparticles" in Journal of Alloys and Compounds, 855 (2021):157523,
https://doi.org/10.1016/j.jallcom.2020.157523 . .

TY  - JOUR
AU  - Aleksić, Jelena
AU  - Barudžija, Tanja
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Bošković, Marko
AU  - Jagličić, Zvonko
AU  - Lisjak, Darja
AU  - Kostić, Ljiljana
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8858
AB  - In this investigation, we have synthesized YbxY1-xF3 solid solutions by fluorination of yttrium and ytterbium sesquioxides with ammonium hydrogen difluoride. According to the XRD analysis, all synthesized YbxY1-xF3 samples have an orthorhombic crystal structure belonging to the β-YF3 structural type. The refinement of crystal structure was done by the Rietveld method within the Pnma space group using the TCH pseudo-Voigt function. The anisotropic peak broadening was analyzed, and the average apparent crystallite size is about 50 nm with a small anisotropy of shape, while the significant microstrain that is highly anisotropic is present in all samples. The temperature-dependent magnetic susceptibility was analyzed by applying the model of a free ion perturbed by the crystal field. We have obtained the effective magnetic quantum numbers Mieff of four Kramer's doublets of Yb3+ ion along with the entire crystal field splitting of the 2F7/2 manifold of Yb3+ in YF3. The acquired maximum energy splitting of the ground level is about 150 K in our most diluted samples. The field-dependent isothermal magnetization measurements were carried out at various temperatures and analyzed by classical Langevin function. Results obtained from magnetic measurements show that all YbxY1-xF3 (x ≠ 0) solid solutions exhibit pure paramagnetic behavior in the whole temperature range from 2 to 300 K, with a predominant antiferromagnetic exchange interactions. © 2020 Elsevier Ltd
T2  - Journal of Physics and Chemistry of Solids
T1  - Investigation of structural, microstructural and magnetic properties of YbxY1-xF3 solid solutions
VL  - 142
SP  - 109449
DO  - 10.1016/j.jpcs.2020.109449
ER  - 

@article{
author = "Aleksić, Jelena and Barudžija, Tanja and Jugović, Dragana and Mitrić, Miodrag and Bošković, Marko and Jagličić, Zvonko and Lisjak, Darja and Kostić, Ljiljana",
year = "2020",
abstract = "In this investigation, we have synthesized YbxY1-xF3 solid solutions by fluorination of yttrium and ytterbium sesquioxides with ammonium hydrogen difluoride. According to the XRD analysis, all synthesized YbxY1-xF3 samples have an orthorhombic crystal structure belonging to the β-YF3 structural type. The refinement of crystal structure was done by the Rietveld method within the Pnma space group using the TCH pseudo-Voigt function. The anisotropic peak broadening was analyzed, and the average apparent crystallite size is about 50 nm with a small anisotropy of shape, while the significant microstrain that is highly anisotropic is present in all samples. The temperature-dependent magnetic susceptibility was analyzed by applying the model of a free ion perturbed by the crystal field. We have obtained the effective magnetic quantum numbers Mieff of four Kramer's doublets of Yb3+ ion along with the entire crystal field splitting of the 2F7/2 manifold of Yb3+ in YF3. The acquired maximum energy splitting of the ground level is about 150 K in our most diluted samples. The field-dependent isothermal magnetization measurements were carried out at various temperatures and analyzed by classical Langevin function. Results obtained from magnetic measurements show that all YbxY1-xF3 (x ≠ 0) solid solutions exhibit pure paramagnetic behavior in the whole temperature range from 2 to 300 K, with a predominant antiferromagnetic exchange interactions. © 2020 Elsevier Ltd",
journal = "Journal of Physics and Chemistry of Solids",
title = "Investigation of structural, microstructural and magnetic properties of YbxY1-xF3 solid solutions",
volume = "142",
pages = "109449",
doi = "10.1016/j.jpcs.2020.109449"
}

Aleksić, J., Barudžija, T., Jugović, D., Mitrić, M., Bošković, M., Jagličić, Z., Lisjak, D.,& Kostić, L.. (2020). Investigation of structural, microstructural and magnetic properties of YbxY1-xF3 solid solutions. in Journal of Physics and Chemistry of Solids, 142, 109449.
https://doi.org/10.1016/j.jpcs.2020.109449

Aleksić J, Barudžija T, Jugović D, Mitrić M, Bošković M, Jagličić Z, Lisjak D, Kostić L. Investigation of structural, microstructural and magnetic properties of YbxY1-xF3 solid solutions. in Journal of Physics and Chemistry of Solids. 2020;142:109449.
doi:10.1016/j.jpcs.2020.109449 .

Aleksić, Jelena, Barudžija, Tanja, Jugović, Dragana, Mitrić, Miodrag, Bošković, Marko, Jagličić, Zvonko, Lisjak, Darja, Kostić, Ljiljana, "Investigation of structural, microstructural and magnetic properties of YbxY1-xF3 solid solutions" in Journal of Physics and Chemistry of Solids, 142 (2020):109449,
https://doi.org/10.1016/j.jpcs.2020.109449 . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Milivojević, Dušan
AU  - Pozek, Miroslav
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Jović Orsini, Nataša
AU  - Marković, Mirjana
AU  - Arsikin, Katarina M.
AU  - Paunović, Verica G.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1889
AB  - Ultrasmall iron oxide (USPIO) nanoparticles, with diameter mostly less than 3 nm dispersed in an organic carrier fluid were synthesized by polyol route. The evolution of ZFC-FC magnetization curves with temperature, as well as the shift of the ac susceptibility peaks upon changing the frequency, reveal that the nanoparticles in the fluid are non-interacting and superparamagnetic with the blocking temperature T-B similar to 10 K. The Mossbauer spectra analysis proposed the core/shell structure of the nanoparticles consisting of stoichiometric gamma-Fe2O3 core and non-stoichiometric shell. The nanoparticle surface layer has a great influence on their properties which is principally manifested in significant reduction of the magnetization and in a large increase in magnetic anisotropy. Magnetic moments do not saturate in fields up to 5 T, even at the lowest measured temperature, T = 5 K. The average magnetic particle diameter is changed from 1.3 to 1.8 nm with increasing magnetic field from 0 to 5 T which is noticeably smaller than the particle sizes measured by TEM. The estimated effective magnetic anisotropy constant value, K-eff = 2 x 10(5) J/m(3), is two orders of magnitude higher than in the bulk maghemite. Measurements of the longitudinal and transverse NMR relaxivity parameters on water diluted nanoparticle dispersions at 1.5 T gave the values r(1) = 0.028 mmol(-1) s(-1), r(2) = 0.050 mmol(-1) s(-1) and their ratio r(2)/r(1) = 1.8. Continuous increase of the T-1-weighted MRI signal intensity with increasing Fe concentration in the nanoparticle dispersions was observed which makes this ferrofluid to behave as a positive T-1 contrast agent. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Current Applied Physics
T1  - Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties
VL  - 18
IS  - 2
SP  - 141
EP  - 149
DO  - 10.1016/j.cap.2017.11.017
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Milivojević, Dušan and Pozek, Miroslav and Jagličić, Zvonko and Makovec, Darko and Jović Orsini, Nataša and Marković, Mirjana and Arsikin, Katarina M. and Paunović, Verica G.",
year = "2018",
abstract = "Ultrasmall iron oxide (USPIO) nanoparticles, with diameter mostly less than 3 nm dispersed in an organic carrier fluid were synthesized by polyol route. The evolution of ZFC-FC magnetization curves with temperature, as well as the shift of the ac susceptibility peaks upon changing the frequency, reveal that the nanoparticles in the fluid are non-interacting and superparamagnetic with the blocking temperature T-B similar to 10 K. The Mossbauer spectra analysis proposed the core/shell structure of the nanoparticles consisting of stoichiometric gamma-Fe2O3 core and non-stoichiometric shell. The nanoparticle surface layer has a great influence on their properties which is principally manifested in significant reduction of the magnetization and in a large increase in magnetic anisotropy. Magnetic moments do not saturate in fields up to 5 T, even at the lowest measured temperature, T = 5 K. The average magnetic particle diameter is changed from 1.3 to 1.8 nm with increasing magnetic field from 0 to 5 T which is noticeably smaller than the particle sizes measured by TEM. The estimated effective magnetic anisotropy constant value, K-eff = 2 x 10(5) J/m(3), is two orders of magnitude higher than in the bulk maghemite. Measurements of the longitudinal and transverse NMR relaxivity parameters on water diluted nanoparticle dispersions at 1.5 T gave the values r(1) = 0.028 mmol(-1) s(-1), r(2) = 0.050 mmol(-1) s(-1) and their ratio r(2)/r(1) = 1.8. Continuous increase of the T-1-weighted MRI signal intensity with increasing Fe concentration in the nanoparticle dispersions was observed which makes this ferrofluid to behave as a positive T-1 contrast agent. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Current Applied Physics",
title = "Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties",
volume = "18",
number = "2",
pages = "141-149",
doi = "10.1016/j.cap.2017.11.017"
}

Babić-Stojić, B. S., Jokanović, V. R., Milivojević, D., Pozek, M., Jagličić, Z., Makovec, D., Jović Orsini, N., Marković, M., Arsikin, K. M.,& Paunović, V. G.. (2018). Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties. in Current Applied Physics, 18(2), 141-149.
https://doi.org/10.1016/j.cap.2017.11.017

Babić-Stojić BS, Jokanović VR, Milivojević D, Pozek M, Jagličić Z, Makovec D, Jović Orsini N, Marković M, Arsikin KM, Paunović VG. Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties. in Current Applied Physics. 2018;18(2):141-149.
doi:10.1016/j.cap.2017.11.017 .

Babić-Stojić, Branka S., Jokanović, Vukoman R., Milivojević, Dušan, Pozek, Miroslav, Jagličić, Zvonko, Makovec, Darko, Jović Orsini, Nataša, Marković, Mirjana, Arsikin, Katarina M., Paunović, Verica G., "Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties" in Current Applied Physics, 18, no. 2 (2018):141-149,
https://doi.org/10.1016/j.cap.2017.11.017 . .

TY  - JOUR
AU  - Vavra, M.
AU  - Zentkova, M.
AU  - Mihalik, M.
AU  - Mihalik, Jr., M.
AU  - Lazurova, J.
AU  - Girman, V.
AU  - Perović, Marija M.
AU  - Kusigerski, Vladan
AU  - Roupcova, P.
AU  - Jagličić, Zvonko
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7162
AB  - We study the effect of nanometric size on the crystal structure, magnetic environment of iron and magnetization in NdFeO3 system of nanoparticles. The average particle size of NdFeO3 nanoparticles increases with annealing at 600 degrees C from about 15 nm to 40 nm, The smallest particles on annealed sample have size approximately 30 nm and typically have character of single crystalline samples. All samples adopt orthorhombic crystal structure, space group Prima with lattice parameters a = 5.5817 angstrom, b = 7.7663 angstrom and c = 5.456 angstrom for as prepared sample. The presence of superparamagnetic particles was indicated by the Mossbauer measurements. The reduction of dimensionality induces a decrease of T-N1 from 691 K to 544 K. The shift of magnetic hysteresis loop in vertical and horizontal direction was observed at low temperatures after cooling in magnetic field. We attribute such behaviour to exchange bias effect and discuss in the frame of core shellmodel.
T2  - Acta Physica Polonica A
T1  - Exchange Bias Effect in NdFeO3 System of Nanoparticles
VL  - 131
IS  - 4
SP  - 869
EP  - 871
DO  - 10.12693/APhysPolA.131.869
ER  - 

@article{
author = "Vavra, M. and Zentkova, M. and Mihalik, M. and Mihalik, Jr., M. and Lazurova, J. and Girman, V. and Perović, Marija M. and Kusigerski, Vladan and Roupcova, P. and Jagličić, Zvonko",
year = "2017",
abstract = "We study the effect of nanometric size on the crystal structure, magnetic environment of iron and magnetization in NdFeO3 system of nanoparticles. The average particle size of NdFeO3 nanoparticles increases with annealing at 600 degrees C from about 15 nm to 40 nm, The smallest particles on annealed sample have size approximately 30 nm and typically have character of single crystalline samples. All samples adopt orthorhombic crystal structure, space group Prima with lattice parameters a = 5.5817 angstrom, b = 7.7663 angstrom and c = 5.456 angstrom for as prepared sample. The presence of superparamagnetic particles was indicated by the Mossbauer measurements. The reduction of dimensionality induces a decrease of T-N1 from 691 K to 544 K. The shift of magnetic hysteresis loop in vertical and horizontal direction was observed at low temperatures after cooling in magnetic field. We attribute such behaviour to exchange bias effect and discuss in the frame of core shellmodel.",
journal = "Acta Physica Polonica A",
title = "Exchange Bias Effect in NdFeO3 System of Nanoparticles",
volume = "131",
number = "4",
pages = "869-871",
doi = "10.12693/APhysPolA.131.869"
}

Vavra, M., Zentkova, M., Mihalik, M., Mihalik, Jr., M., Lazurova, J., Girman, V., Perović, M. M., Kusigerski, V., Roupcova, P.,& Jagličić, Z.. (2017). Exchange Bias Effect in NdFeO3 System of Nanoparticles. in Acta Physica Polonica A, 131(4), 869-871.
https://doi.org/10.12693/APhysPolA.131.869

Vavra M, Zentkova M, Mihalik M, Mihalik JM, Lazurova J, Girman V, Perović MM, Kusigerski V, Roupcova P, Jagličić Z. Exchange Bias Effect in NdFeO3 System of Nanoparticles. in Acta Physica Polonica A. 2017;131(4):869-871.
doi:10.12693/APhysPolA.131.869 .

Vavra, M., Zentkova, M., Mihalik, M., Mihalik, Jr., M., Lazurova, J., Girman, V., Perović, Marija M., Kusigerski, Vladan, Roupcova, P., Jagličić, Zvonko, "Exchange Bias Effect in NdFeO3 System of Nanoparticles" in Acta Physica Polonica A, 131, no. 4 (2017):869-871,
https://doi.org/10.12693/APhysPolA.131.869 . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Milivojević, Dušan
AU  - Pozek, Miroslav
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Arsikin, Katarina M.
AU  - Paunović, Verica G.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/857
AB  - Gd2O3 nanoparticles of a few nm in size and their agglomerates dispersed in dextrose derived polymer template were synthesized by hydrothermal treatment. The produced nanosized material was investigated by TEM, FTIR spectroscopy, SQUID measurements and NMR relaxometry. Biological evaluation of this material was done by crystal violet and MTT assays to determine the cell viability. Longitudinal and transverse NMR relaxivities of water diluted Gd2O3 nanoparticle dispersions measured at the magnetic field of 1.5 T, estimated to be r(1)(Gd2O3)=9.6 s(-1) mM(-1) in the Gd concentration range 0.1-30 mM and r(2)(Gd2O3)=17.7 s(-1) mM(-1) in the lower concentration range 0.1-0.8 mM, are significantly higher than the corresponding relaxivities measured for the standard contrast agent r1 (Gd-DTPA)=4.1 s(-1) mM(-1) and r(2)(Gd-DTPA)= 5.1 s(-1) mM(-1). The ratio of the two relaxivities for Gd2O3 nanoparticles r(2)/r(1) = 1.8 is suitable for T-1-weighted imaging. Good MRI signal intensities of the water diluted Gd2O3 nanoparticle dispersions were recorded at lower Gd concentrations 0.2-0.8 mM. The Gd2O3 samples did not exert any significant cytotoxic effects at Gd concentrations of 0.2 mM and below. These properties of the produced Gd2O3 nanoparticles in hydrothermally modified dextrose make them promising for potential application in MRI for the design of a positive MRI contrast agent. (C) 2015 Elsevier B.V. All rights reserved.
T2  - Journal of Magnetism and Magnetic Materials
T1  - Gd2O3 nanoparticles stabilized by hydrothermally modified dextrose for positive contrast magnetic resonance imaging
VL  - 403
SP  - 118
EP  - 126
DO  - 10.1016/j.jmmm.2015.11.075
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Milivojević, Dušan and Pozek, Miroslav and Jagličić, Zvonko and Makovec, Darko and Arsikin, Katarina M. and Paunović, Verica G.",
year = "2016",
abstract = "Gd2O3 nanoparticles of a few nm in size and their agglomerates dispersed in dextrose derived polymer template were synthesized by hydrothermal treatment. The produced nanosized material was investigated by TEM, FTIR spectroscopy, SQUID measurements and NMR relaxometry. Biological evaluation of this material was done by crystal violet and MTT assays to determine the cell viability. Longitudinal and transverse NMR relaxivities of water diluted Gd2O3 nanoparticle dispersions measured at the magnetic field of 1.5 T, estimated to be r(1)(Gd2O3)=9.6 s(-1) mM(-1) in the Gd concentration range 0.1-30 mM and r(2)(Gd2O3)=17.7 s(-1) mM(-1) in the lower concentration range 0.1-0.8 mM, are significantly higher than the corresponding relaxivities measured for the standard contrast agent r1 (Gd-DTPA)=4.1 s(-1) mM(-1) and r(2)(Gd-DTPA)= 5.1 s(-1) mM(-1). The ratio of the two relaxivities for Gd2O3 nanoparticles r(2)/r(1) = 1.8 is suitable for T-1-weighted imaging. Good MRI signal intensities of the water diluted Gd2O3 nanoparticle dispersions were recorded at lower Gd concentrations 0.2-0.8 mM. The Gd2O3 samples did not exert any significant cytotoxic effects at Gd concentrations of 0.2 mM and below. These properties of the produced Gd2O3 nanoparticles in hydrothermally modified dextrose make them promising for potential application in MRI for the design of a positive MRI contrast agent. (C) 2015 Elsevier B.V. All rights reserved.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "Gd2O3 nanoparticles stabilized by hydrothermally modified dextrose for positive contrast magnetic resonance imaging",
volume = "403",
pages = "118-126",
doi = "10.1016/j.jmmm.2015.11.075"
}

Babić-Stojić, B. S., Jokanović, V. R., Milivojević, D., Pozek, M., Jagličić, Z., Makovec, D., Arsikin, K. M.,& Paunović, V. G.. (2016). Gd2O3 nanoparticles stabilized by hydrothermally modified dextrose for positive contrast magnetic resonance imaging. in Journal of Magnetism and Magnetic Materials, 403, 118-126.
https://doi.org/10.1016/j.jmmm.2015.11.075

Babić-Stojić BS, Jokanović VR, Milivojević D, Pozek M, Jagličić Z, Makovec D, Arsikin KM, Paunović VG. Gd2O3 nanoparticles stabilized by hydrothermally modified dextrose for positive contrast magnetic resonance imaging. in Journal of Magnetism and Magnetic Materials. 2016;403:118-126.
doi:10.1016/j.jmmm.2015.11.075 .

Babić-Stojić, Branka S., Jokanović, Vukoman R., Milivojević, Dušan, Pozek, Miroslav, Jagličić, Zvonko, Makovec, Darko, Arsikin, Katarina M., Paunović, Verica G., "Gd2O3 nanoparticles stabilized by hydrothermally modified dextrose for positive contrast magnetic resonance imaging" in Journal of Magnetism and Magnetic Materials, 403 (2016):118-126,
https://doi.org/10.1016/j.jmmm.2015.11.075 . .

TY  - CONF
AU  - Savić, Slavica
AU  - Tadić, Marin
AU  - Jagličić, Zvonko
AU  - Mančić, Lidija
AU  - Vojisavljević, Katarina
AU  - Branković, Goran O.
PY  - 2015
UR  - http://dais.sanu.ac.rs/123456789/742
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7524
AB  - Spinel materials based on Mn and Ni has been intensively studied over the past years due to their excellent semiconductor properties. Nickel manganite as NTC thermistor is widely used today in different industrial sectors. Here we report the complex polymerization method (CPM) for producing nickel manganite fine particles with a homogeneous distribution of constituent cations in the crystal lattice that ensures formation of dense monophased ceramic with the novel magnetic properties after been sintered in oxygen and air atmosphere. Phase composition of the synthesized materials was examined by XRPD, while the morphology of the powder and microstructure of ceramic were investigated using FESEM and SEM analyses, respectively. The magnetic properties of the samples have been studied by measuring the temperature and field dependence of magnetization. Magnetic measurements of M(T) reveal rather complex magnetic properties and multiple magnetic phase transitions. In the case of air atmosphere we found three magnetic phase transitions with transition temperatures at TM1=35 K, TM2=101 K and TM3=120 K. TM1 maximum is strongly dependent on the strength of the applied magnetic field (TM1 decreases with increasing applied field) whereas the TM3 is field independent The values of the coercivity, remanent magnetization and saturation magnetization at 100 K are: HC = 184 Oe, Mr = 1.92 emu/g and MS = 7.88 emu/g, respectively. The measured values at 5 K are HC = 1035 Oe, Mr = 7.70 emu/g and MS = 14.47 emu/g. Moreover, hysteresis properties measured after cooling of the sample in magnetic field show exchange bias effect with an exchange bias field |HEB=196 Oe. For the sample synthetized in oxygen atmosphere, the magnetization dependence of temperature M(T) and AC susceptibility data obtained from SQUID measurements clearly demonstrates that quadruple magnetic phase transitions can be readily detected at TM1~115 K, TM2~105 K, TM3~38 K and TM4~7 K. These findings suggest the novel magnetic transition for nickel manganite at low temperature TM4. The temperatures of observed maximums in χ’(T) and χ’’(T) parts of susceptibility are frequency independent, whereas the height of the peaks decreases with increasing frequency. The fact that TM4 does not shift with the increase of the frequency led us to the conclusion that there are no spin-glass/surface effect and/or blocking temperature/finite size effect connected to the NiMn2O4 ceramic. Therefore, the low-temperature peak TM4 in AC susceptibility is associated with ferromagnetic-like and antiferromagnetic-like magnetic transition in the interfacial FM/AFM internal structure. The exchange bias effect was found in a field cooled hysteresis loops at 5 K. The field cooling of the sample was under a magnetic field of 100 Oe and 10 kOe whereas the determined exchange bias fields were |HEB|=129 Oe and 182 Oe, respectively. The analysis of the results and comparison with literature data allowed us to conjecture that the mixed oxidation states of Mn ions and ferromagnetic and antiferromagnetic sublattice orders tailor these interesting magnetic properties.
PB  - Belgrade : Institute for Multidisciplinary Research
C3  - Programme and the Book of Abstracts / 3rd Conference of the Serbian Society for Ceramic Materials, 3CSCS-2015, June 15-17, 2015, Belgrade, Serbia
T1  - Magnetic properties of nickel manganite obtained by a complex polymerization method
SP  - 111
EP  - 112
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7524
ER  - 

@conference{
author = "Savić, Slavica and Tadić, Marin and Jagličić, Zvonko and Mančić, Lidija and Vojisavljević, Katarina and Branković, Goran O.",
year = "2015",
abstract = "Spinel materials based on Mn and Ni has been intensively studied over the past years due to their excellent semiconductor properties. Nickel manganite as NTC thermistor is widely used today in different industrial sectors. Here we report the complex polymerization method (CPM) for producing nickel manganite fine particles with a homogeneous distribution of constituent cations in the crystal lattice that ensures formation of dense monophased ceramic with the novel magnetic properties after been sintered in oxygen and air atmosphere. Phase composition of the synthesized materials was examined by XRPD, while the morphology of the powder and microstructure of ceramic were investigated using FESEM and SEM analyses, respectively. The magnetic properties of the samples have been studied by measuring the temperature and field dependence of magnetization. Magnetic measurements of M(T) reveal rather complex magnetic properties and multiple magnetic phase transitions. In the case of air atmosphere we found three magnetic phase transitions with transition temperatures at TM1=35 K, TM2=101 K and TM3=120 K. TM1 maximum is strongly dependent on the strength of the applied magnetic field (TM1 decreases with increasing applied field) whereas the TM3 is field independent The values of the coercivity, remanent magnetization and saturation magnetization at 100 K are: HC = 184 Oe, Mr = 1.92 emu/g and MS = 7.88 emu/g, respectively. The measured values at 5 K are HC = 1035 Oe, Mr = 7.70 emu/g and MS = 14.47 emu/g. Moreover, hysteresis properties measured after cooling of the sample in magnetic field show exchange bias effect with an exchange bias field |HEB=196 Oe. For the sample synthetized in oxygen atmosphere, the magnetization dependence of temperature M(T) and AC susceptibility data obtained from SQUID measurements clearly demonstrates that quadruple magnetic phase transitions can be readily detected at TM1~115 K, TM2~105 K, TM3~38 K and TM4~7 K. These findings suggest the novel magnetic transition for nickel manganite at low temperature TM4. The temperatures of observed maximums in χ’(T) and χ’’(T) parts of susceptibility are frequency independent, whereas the height of the peaks decreases with increasing frequency. The fact that TM4 does not shift with the increase of the frequency led us to the conclusion that there are no spin-glass/surface effect and/or blocking temperature/finite size effect connected to the NiMn2O4 ceramic. Therefore, the low-temperature peak TM4 in AC susceptibility is associated with ferromagnetic-like and antiferromagnetic-like magnetic transition in the interfacial FM/AFM internal structure. The exchange bias effect was found in a field cooled hysteresis loops at 5 K. The field cooling of the sample was under a magnetic field of 100 Oe and 10 kOe whereas the determined exchange bias fields were |HEB|=129 Oe and 182 Oe, respectively. The analysis of the results and comparison with literature data allowed us to conjecture that the mixed oxidation states of Mn ions and ferromagnetic and antiferromagnetic sublattice orders tailor these interesting magnetic properties.",
publisher = "Belgrade : Institute for Multidisciplinary Research",
journal = "Programme and the Book of Abstracts / 3rd Conference of the Serbian Society for Ceramic Materials, 3CSCS-2015, June 15-17, 2015, Belgrade, Serbia",
title = "Magnetic properties of nickel manganite obtained by a complex polymerization method",
pages = "111-112",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7524"
}

Savić, S., Tadić, M., Jagličić, Z., Mančić, L., Vojisavljević, K.,& Branković, G. O.. (2015). Magnetic properties of nickel manganite obtained by a complex polymerization method. in Programme and the Book of Abstracts / 3rd Conference of the Serbian Society for Ceramic Materials, 3CSCS-2015, June 15-17, 2015, Belgrade, Serbia
Belgrade : Institute for Multidisciplinary Research., 111-112.
https://hdl.handle.net/21.15107/rcub_vinar_7524

Savić S, Tadić M, Jagličić Z, Mančić L, Vojisavljević K, Branković GO. Magnetic properties of nickel manganite obtained by a complex polymerization method. in Programme and the Book of Abstracts / 3rd Conference of the Serbian Society for Ceramic Materials, 3CSCS-2015, June 15-17, 2015, Belgrade, Serbia. 2015;:111-112.
https://hdl.handle.net/21.15107/rcub_vinar_7524 .

Savić, Slavica, Tadić, Marin, Jagličić, Zvonko, Mančić, Lidija, Vojisavljević, Katarina, Branković, Goran O., "Magnetic properties of nickel manganite obtained by a complex polymerization method" in Programme and the Book of Abstracts / 3rd Conference of the Serbian Society for Ceramic Materials, 3CSCS-2015, June 15-17, 2015, Belgrade, Serbia (2015):111-112,
https://hdl.handle.net/21.15107/rcub_vinar_7524 .

TY  - CONF
AU  - Lazurova, J.
AU  - Mihalik, M.
AU  - Mihalik, Jr., M.
AU  - Vavra, M.
AU  - Zentkova, M.
AU  - Briancin, J.
AU  - Perović, Marija M.
AU  - Kusigerski, Vladan
AU  - Schneeweiss, Oldřich B.
AU  - Roupcova, P.
AU  - Kamenev, K. V.
AU  - Misek, M.
AU  - Jagličić, Zvonko
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7067
AB  - The effect of particle reduction to nanoscale size and substitution of Mn3+ ions for Fe3+ ions on the crystal structure, lattice dynamics, Mossbauer spectra and magnetic properties in NdFe(1-x)MnxO(3) compounds have been studied. X-ray powder diffraction and Raman spectroscopy revealed that the Jahn-Teller distortion of lattice dominates for samples with x GT 0.4. The average particle size of NdFeO3 nanoparticles (NAP) increases with annealing at 600 degrees C from about 15 nm to 25 nm. The presence of superparamagnetic particles was indicated by Mossbauer measurements in NdFeO3 NAP system. Sextets in NdFe(1-x)MnxO(3) Mssbauer spectra can be modelled with several local environments of Fe3+ induced by substitution. The reduction of dimensionality and the substitution induce a decrease of the Neel temperature T-Nl from 691 K to 544 K for NAP or to 356 K for x = 0.4, however the temperature of spin reorientation T-SR increases with substitution. The saturated magnetization obtained at 1.9 K increases and ferromagnetic component is removed below T-SR with the substitution.
C3  - Journal of Physics: Conference Series
T1  - Magnetic Properties and Mossbauer spectroscopy of NdFe(1-x)MnxO(3)
VL  - 592
DO  - 10.1088/1742-6596/592/1/012117
ER  - 

@conference{
author = "Lazurova, J. and Mihalik, M. and Mihalik, Jr., M. and Vavra, M. and Zentkova, M. and Briancin, J. and Perović, Marija M. and Kusigerski, Vladan and Schneeweiss, Oldřich B. and Roupcova, P. and Kamenev, K. V. and Misek, M. and Jagličić, Zvonko",
year = "2015",
abstract = "The effect of particle reduction to nanoscale size and substitution of Mn3+ ions for Fe3+ ions on the crystal structure, lattice dynamics, Mossbauer spectra and magnetic properties in NdFe(1-x)MnxO(3) compounds have been studied. X-ray powder diffraction and Raman spectroscopy revealed that the Jahn-Teller distortion of lattice dominates for samples with x GT 0.4. The average particle size of NdFeO3 nanoparticles (NAP) increases with annealing at 600 degrees C from about 15 nm to 25 nm. The presence of superparamagnetic particles was indicated by Mossbauer measurements in NdFeO3 NAP system. Sextets in NdFe(1-x)MnxO(3) Mssbauer spectra can be modelled with several local environments of Fe3+ induced by substitution. The reduction of dimensionality and the substitution induce a decrease of the Neel temperature T-Nl from 691 K to 544 K for NAP or to 356 K for x = 0.4, however the temperature of spin reorientation T-SR increases with substitution. The saturated magnetization obtained at 1.9 K increases and ferromagnetic component is removed below T-SR with the substitution.",
journal = "Journal of Physics: Conference Series",
title = "Magnetic Properties and Mossbauer spectroscopy of NdFe(1-x)MnxO(3)",
volume = "592",
doi = "10.1088/1742-6596/592/1/012117"
}

Lazurova, J., Mihalik, M., Mihalik, Jr., M., Vavra, M., Zentkova, M., Briancin, J., Perović, M. M., Kusigerski, V., Schneeweiss, O. B., Roupcova, P., Kamenev, K. V., Misek, M.,& Jagličić, Z.. (2015). Magnetic Properties and Mossbauer spectroscopy of NdFe(1-x)MnxO(3). in Journal of Physics: Conference Series, 592.
https://doi.org/10.1088/1742-6596/592/1/012117

Lazurova J, Mihalik M, Mihalik JM, Vavra M, Zentkova M, Briancin J, Perović MM, Kusigerski V, Schneeweiss OB, Roupcova P, Kamenev KV, Misek M, Jagličić Z. Magnetic Properties and Mossbauer spectroscopy of NdFe(1-x)MnxO(3). in Journal of Physics: Conference Series. 2015;592.
doi:10.1088/1742-6596/592/1/012117 .

Lazurova, J., Mihalik, M., Mihalik, Jr., M., Vavra, M., Zentkova, M., Briancin, J., Perović, Marija M., Kusigerski, Vladan, Schneeweiss, Oldřich B., Roupcova, P., Kamenev, K. V., Misek, M., Jagličić, Zvonko, "Magnetic Properties and Mossbauer spectroscopy of NdFe(1-x)MnxO(3)" in Journal of Physics: Conference Series, 592 (2015),
https://doi.org/10.1088/1742-6596/592/1/012117 . .

TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Jović, Nataša G.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5912
AB  - The work presents structural and magnetic properties of ultrasmall magnetic nanoparticles consisting of inorganic iron oxide core and organic ester shell, dispersed in an organic fluid, synthesized via polyol route. The structure analysis shows that nanoparticles are crystalline, less than 3 nm in size, mutually clearly separated. The magnetic properties are in accordance with the size of the nanoparticles and do not indicate interparticle interactions. The particles show pure superparamagnetic behavior with very low blocking temperature. ZFCFC bifurcation and ac susceptibility peaks are at temperatures T-B LT 12 K. The properties of fluid were compared with dried powder sample. Drying of fluid brings about interactions between the magnetic nanoparticles that considerably affect spin dynamics of the particles. The surface of nanoparticles has a significant influence on their behavior. The Mssbauer parameters indicate existence of gamma-Fe2O3 core and non-stoichiometric surface layer. Magnetic field dependent magnetization analysis suggests smaller apparent size of the particles d(0) = 0.56 nm. High magnetic anisotropy due to surface layer anisotropy was measured to be of the order 10(6) erg/cm(3) that is two orders of magnitude higher than that in bulk material. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Magnetic properties of ultrasmall iron-oxide nanoparticles
VL  - 595
SP  - 153
EP  - 157
DO  - 10.1016/j.jallcom.2014.01.112
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Makovec, Darko and Jović, Nataša G.",
year = "2014",
abstract = "The work presents structural and magnetic properties of ultrasmall magnetic nanoparticles consisting of inorganic iron oxide core and organic ester shell, dispersed in an organic fluid, synthesized via polyol route. The structure analysis shows that nanoparticles are crystalline, less than 3 nm in size, mutually clearly separated. The magnetic properties are in accordance with the size of the nanoparticles and do not indicate interparticle interactions. The particles show pure superparamagnetic behavior with very low blocking temperature. ZFCFC bifurcation and ac susceptibility peaks are at temperatures T-B LT 12 K. The properties of fluid were compared with dried powder sample. Drying of fluid brings about interactions between the magnetic nanoparticles that considerably affect spin dynamics of the particles. The surface of nanoparticles has a significant influence on their behavior. The Mssbauer parameters indicate existence of gamma-Fe2O3 core and non-stoichiometric surface layer. Magnetic field dependent magnetization analysis suggests smaller apparent size of the particles d(0) = 0.56 nm. High magnetic anisotropy due to surface layer anisotropy was measured to be of the order 10(6) erg/cm(3) that is two orders of magnitude higher than that in bulk material. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Magnetic properties of ultrasmall iron-oxide nanoparticles",
volume = "595",
pages = "153-157",
doi = "10.1016/j.jallcom.2014.01.112"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z., Makovec, D.,& Jović, N. G.. (2014). Magnetic properties of ultrasmall iron-oxide nanoparticles. in Journal of Alloys and Compounds, 595, 153-157.
https://doi.org/10.1016/j.jallcom.2014.01.112

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Makovec D, Jović NG. Magnetic properties of ultrasmall iron-oxide nanoparticles. in Journal of Alloys and Compounds. 2014;595:153-157.
doi:10.1016/j.jallcom.2014.01.112 .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Makovec, Darko, Jović, Nataša G., "Magnetic properties of ultrasmall iron-oxide nanoparticles" in Journal of Alloys and Compounds, 595 (2014):153-157,
https://doi.org/10.1016/j.jallcom.2014.01.112 . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Milivojević, Dušan
AU  - Pozek, Miroslav
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Arsikin, Katarina M.
AU  - Paunović, Verica G.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/414
AB  - Gd2O3 nanoparticles and their agglomerates from approximately 10 to 80 nm in size suspended in an organic liquid were synthesized via polyol route. The reaction between diethylene glycol and added acetic acid, which occurred simultaneously with the synthesis of Gd2O3 nanoparticles, was catalyzed by sodium bisulfate to transform as much as possible diethylene glycol in corresponding ester at the end of complete reaction. The produced nanosized material of gadolinium oxide was investigated by TEM, DLS, FTIR spectroscopy, and NMR relaxometry. Biological evaluation of this material was done by MTT and crystal violet assays to determine the cell viability. Longitudinal and transverse relaxivities of water-diluted Gd2O3 nanoparticle suspensions estimated to be r(1) = 13.6 and r(2) = 14.7 s(-1) mM(-1) are about three times higher compared to the relaxivities obtained for standard contrast agent Gd-DTPA (Magnevist). Good MRI signal intensities of the water-diluted Gd2O3 nanoparticle suspensions were recorded in the Gd concentration range 0.2-0.3 mM for which the suspensions were not toxic exhibiting simultaneously higher signal intensities than those for Magnevist in the Gd concentration range 0.4-1 mM for which this standard contrast agent was not toxic. These properties make the produced Gd2O3 nanoparticle material promising for potential application as MRI contrast agent.
T2  - Journal of Nanoparticle Research
T1  - NMR relaxometric properties and cytotoxicity of Gd2O3 nanoparticle suspensions in an organic liquid
VL  - 16
IS  - 10
DO  - 10.1007/s11051-014-2663-0
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Milivojević, Dušan and Pozek, Miroslav and Jagličić, Zvonko and Makovec, Darko and Arsikin, Katarina M. and Paunović, Verica G.",
year = "2014",
abstract = "Gd2O3 nanoparticles and their agglomerates from approximately 10 to 80 nm in size suspended in an organic liquid were synthesized via polyol route. The reaction between diethylene glycol and added acetic acid, which occurred simultaneously with the synthesis of Gd2O3 nanoparticles, was catalyzed by sodium bisulfate to transform as much as possible diethylene glycol in corresponding ester at the end of complete reaction. The produced nanosized material of gadolinium oxide was investigated by TEM, DLS, FTIR spectroscopy, and NMR relaxometry. Biological evaluation of this material was done by MTT and crystal violet assays to determine the cell viability. Longitudinal and transverse relaxivities of water-diluted Gd2O3 nanoparticle suspensions estimated to be r(1) = 13.6 and r(2) = 14.7 s(-1) mM(-1) are about three times higher compared to the relaxivities obtained for standard contrast agent Gd-DTPA (Magnevist). Good MRI signal intensities of the water-diluted Gd2O3 nanoparticle suspensions were recorded in the Gd concentration range 0.2-0.3 mM for which the suspensions were not toxic exhibiting simultaneously higher signal intensities than those for Magnevist in the Gd concentration range 0.4-1 mM for which this standard contrast agent was not toxic. These properties make the produced Gd2O3 nanoparticle material promising for potential application as MRI contrast agent.",
journal = "Journal of Nanoparticle Research",
title = "NMR relaxometric properties and cytotoxicity of Gd2O3 nanoparticle suspensions in an organic liquid",
volume = "16",
number = "10",
doi = "10.1007/s11051-014-2663-0"
}

Babić-Stojić, B. S., Jokanović, V. R., Milivojević, D., Pozek, M., Jagličić, Z., Makovec, D., Arsikin, K. M.,& Paunović, V. G.. (2014). NMR relaxometric properties and cytotoxicity of Gd2O3 nanoparticle suspensions in an organic liquid. in Journal of Nanoparticle Research, 16(10).
https://doi.org/10.1007/s11051-014-2663-0

Babić-Stojić BS, Jokanović VR, Milivojević D, Pozek M, Jagličić Z, Makovec D, Arsikin KM, Paunović VG. NMR relaxometric properties and cytotoxicity of Gd2O3 nanoparticle suspensions in an organic liquid. in Journal of Nanoparticle Research. 2014;16(10).
doi:10.1007/s11051-014-2663-0 .

Babić-Stojić, Branka S., Jokanović, Vukoman R., Milivojević, Dušan, Pozek, Miroslav, Jagličić, Zvonko, Makovec, Darko, Arsikin, Katarina M., Paunović, Verica G., "NMR relaxometric properties and cytotoxicity of Gd2O3 nanoparticle suspensions in an organic liquid" in Journal of Nanoparticle Research, 16, no. 10 (2014),
https://doi.org/10.1007/s11051-014-2663-0 . .

TY  - JOUR
AU  - Savić, S. M.
AU  - Tadić, Marin
AU  - Jagličić, Zvonko
AU  - Vojisavljevic, K.
AU  - Mančić, Lidija
AU  - Branković, Goran O.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/186
AB  - Structural, electrical and magnetic properties of nickel manganite ceramics obtained by sintering fine powders prepared by a complex polymerization method are given in this work. The phase composition of the synthesized material was examined by x-ray powder diffraction (XRPD). Field-emission scanning electron microscopy (FE-SEM) was used to analyze the obtained powder morphology. Scanning electron microscopy (SEM) was used to analyze the microstructure of sintered ceramics. The activation energy of conduction E-a and the coefficient of temperature sensitivity B-25/100 were calculated from direct current (DC) resistivity measurements. The magnetization dependence of temperature M(T) and alternating current (AC) susceptibility data obtained from SQUID measurements clearly demonstrate that quadruple magnetic phase transitions can be readily detected at T-M1 similar to 115 K, T-M2 similar to 105 K, T-M3 similar to 38 K and T-M4 similar to 7 K. These findings suggest a novel magnetic transition for nickel manganite at low temperature T-M4. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Structural, electrical and magnetic properties of nickel manganite obtained by a complex polymerization method
VL  - 40
IS  - 10
SP  - 15515
EP  - 15521
DO  - 10.1016/j.ceramint.2014.07.024
ER  - 

@article{
author = "Savić, S. M. and Tadić, Marin and Jagličić, Zvonko and Vojisavljevic, K. and Mančić, Lidija and Branković, Goran O.",
year = "2014",
abstract = "Structural, electrical and magnetic properties of nickel manganite ceramics obtained by sintering fine powders prepared by a complex polymerization method are given in this work. The phase composition of the synthesized material was examined by x-ray powder diffraction (XRPD). Field-emission scanning electron microscopy (FE-SEM) was used to analyze the obtained powder morphology. Scanning electron microscopy (SEM) was used to analyze the microstructure of sintered ceramics. The activation energy of conduction E-a and the coefficient of temperature sensitivity B-25/100 were calculated from direct current (DC) resistivity measurements. The magnetization dependence of temperature M(T) and alternating current (AC) susceptibility data obtained from SQUID measurements clearly demonstrate that quadruple magnetic phase transitions can be readily detected at T-M1 similar to 115 K, T-M2 similar to 105 K, T-M3 similar to 38 K and T-M4 similar to 7 K. These findings suggest a novel magnetic transition for nickel manganite at low temperature T-M4. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Structural, electrical and magnetic properties of nickel manganite obtained by a complex polymerization method",
volume = "40",
number = "10",
pages = "15515-15521",
doi = "10.1016/j.ceramint.2014.07.024"
}

Savić, S. M., Tadić, M., Jagličić, Z., Vojisavljevic, K., Mančić, L.,& Branković, G. O.. (2014). Structural, electrical and magnetic properties of nickel manganite obtained by a complex polymerization method. in Ceramics International, 40(10), 15515-15521.
https://doi.org/10.1016/j.ceramint.2014.07.024

Savić SM, Tadić M, Jagličić Z, Vojisavljevic K, Mančić L, Branković GO. Structural, electrical and magnetic properties of nickel manganite obtained by a complex polymerization method. in Ceramics International. 2014;40(10):15515-15521.
doi:10.1016/j.ceramint.2014.07.024 .

Savić, S. M., Tadić, Marin, Jagličić, Zvonko, Vojisavljevic, K., Mančić, Lidija, Branković, Goran O., "Structural, electrical and magnetic properties of nickel manganite obtained by a complex polymerization method" in Ceramics International, 40, no. 10 (2014):15515-15521,
https://doi.org/10.1016/j.ceramint.2014.07.024 . .

TY  - JOUR
AU  - Tadić, Marin
AU  - Savić, S. M.
AU  - Jagličić, Zvonko
AU  - Vojisavljevic, K.
AU  - Radojkovic, A.
AU  - Prsic, S.
AU  - Nikolic, Dobrica
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5850
AB  - We present magnetic properties of NiMn2O4-delta (nickel manganite) which was synthesized by complex polymerization synthesis method followed by successive heat treatment and final calcinations in air at 1200 degrees C. The sample was characterized by using X-ray powder diffractometer (XRPD), scanning electron microscopy (SEM), field-emission scanning electron microscopy (FE-SEM) and superconducting quantum interference device (SQUID) magnetometer. The XRPD and FE-SEM studies revealed NiMn2O4-delta phase and good crystallinity of particles. No other impurities have been observed by XRPD. The magnetic properties of the sample have been studied by measuring the temperature and field dependence of magnetization. Magnetic measurements of M(T) reveal rather complex magnetic properties and multiple magnetic phase transitions. We show three magnetic phase transitions with transition temperatures at T-M1 = 35 K (long-range antiferromagnetic transition), T-M2 = 101 K (antiferromagnetic-type transition) and T-M3 = 120 K (ferromagnetic-like transition). We found that the T-M1 transition is strongly dependent on the strength of the applied magnetic field (T-M1 decreases with increasing applied field) whereas the T-M3 is field independent. Otherwise, the T-M2 maximum almost disappears in higher applied magnetic fields (H = 1 kOe and 10 kOe). Magnetic measurements of M(H) show hysteretic behavior below T-M3. Moreover, hysteresis properties measured after cooling of the sample in magnetic field of 10 kOe show exchange bias effect with an exchange bias field vertical bar H-EB vertical bar= 196 Oe. In summary, the properties that distinguish the investigated NiMn2O4-delta sample from other bulk, thin film, ceramic and nanoparticle NiMn2O4-delta systems are the triple magnetic transitions with sharp increase of the ZFC and FC magnetizations at 120 K and the exchange bias effect. The analysis of the results and comparison with literature data allowed us to conjecture that the mixed oxidation states of Mn ions, ferromagnetic and antiferromagnetic sublattice orders and surface effects in the sample tailor these interesting magnetic properties. (C) 2013 Elsevier B. V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Magnetic properties of NiMn2O4-delta (nickel manganite): Multiple magnetic phase transitions and exchange bias effect
VL  - 588
SP  - 465
EP  - 469
DO  - 10.1016/j.jallcom.2013.11.025
ER  - 

@article{
author = "Tadić, Marin and Savić, S. M. and Jagličić, Zvonko and Vojisavljevic, K. and Radojkovic, A. and Prsic, S. and Nikolic, Dobrica",
year = "2014",
abstract = "We present magnetic properties of NiMn2O4-delta (nickel manganite) which was synthesized by complex polymerization synthesis method followed by successive heat treatment and final calcinations in air at 1200 degrees C. The sample was characterized by using X-ray powder diffractometer (XRPD), scanning electron microscopy (SEM), field-emission scanning electron microscopy (FE-SEM) and superconducting quantum interference device (SQUID) magnetometer. The XRPD and FE-SEM studies revealed NiMn2O4-delta phase and good crystallinity of particles. No other impurities have been observed by XRPD. The magnetic properties of the sample have been studied by measuring the temperature and field dependence of magnetization. Magnetic measurements of M(T) reveal rather complex magnetic properties and multiple magnetic phase transitions. We show three magnetic phase transitions with transition temperatures at T-M1 = 35 K (long-range antiferromagnetic transition), T-M2 = 101 K (antiferromagnetic-type transition) and T-M3 = 120 K (ferromagnetic-like transition). We found that the T-M1 transition is strongly dependent on the strength of the applied magnetic field (T-M1 decreases with increasing applied field) whereas the T-M3 is field independent. Otherwise, the T-M2 maximum almost disappears in higher applied magnetic fields (H = 1 kOe and 10 kOe). Magnetic measurements of M(H) show hysteretic behavior below T-M3. Moreover, hysteresis properties measured after cooling of the sample in magnetic field of 10 kOe show exchange bias effect with an exchange bias field vertical bar H-EB vertical bar= 196 Oe. In summary, the properties that distinguish the investigated NiMn2O4-delta sample from other bulk, thin film, ceramic and nanoparticle NiMn2O4-delta systems are the triple magnetic transitions with sharp increase of the ZFC and FC magnetizations at 120 K and the exchange bias effect. The analysis of the results and comparison with literature data allowed us to conjecture that the mixed oxidation states of Mn ions, ferromagnetic and antiferromagnetic sublattice orders and surface effects in the sample tailor these interesting magnetic properties. (C) 2013 Elsevier B. V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Magnetic properties of NiMn2O4-delta (nickel manganite): Multiple magnetic phase transitions and exchange bias effect",
volume = "588",
pages = "465-469",
doi = "10.1016/j.jallcom.2013.11.025"
}

Tadić, M., Savić, S. M., Jagličić, Z., Vojisavljevic, K., Radojkovic, A., Prsic, S.,& Nikolic, D.. (2014). Magnetic properties of NiMn2O4-delta (nickel manganite): Multiple magnetic phase transitions and exchange bias effect. in Journal of Alloys and Compounds, 588, 465-469.
https://doi.org/10.1016/j.jallcom.2013.11.025

Tadić M, Savić SM, Jagličić Z, Vojisavljevic K, Radojkovic A, Prsic S, Nikolic D. Magnetic properties of NiMn2O4-delta (nickel manganite): Multiple magnetic phase transitions and exchange bias effect. in Journal of Alloys and Compounds. 2014;588:465-469.
doi:10.1016/j.jallcom.2013.11.025 .

Tadić, Marin, Savić, S. M., Jagličić, Zvonko, Vojisavljevic, K., Radojkovic, A., Prsic, S., Nikolic, Dobrica, "Magnetic properties of NiMn2O4-delta (nickel manganite): Multiple magnetic phase transitions and exchange bias effect" in Journal of Alloys and Compounds, 588 (2014):465-469,
https://doi.org/10.1016/j.jallcom.2013.11.025 . .

TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Brankovic, D.
AU  - Jović, Nataša G.
AU  - Čolović, Božana M.
AU  - Čupić, Svetlana D.
AU  - Kojić, Dušan
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5471
AB  - The magnetic properties of mesoscopic materials are modified by size and surface effects. We present a sol-gel method used to tailor these effects, and illustrate it on Co1+yAl2-yO4 spinel. Nanocomposites made of spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized. Samples with various mass fractions -x of Co1+yAl2-yO4 in composite, ranging from predominantly SiO2 (x = 10 wt%) to predominantly spinel (x = 95 wt%), and with various Co concentrations in spinel y were studied. The spinel grain sizes were below 100 nm with a large size distribution, for samples with predominant spinel phase. Those samples showed Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta approximate to -100 K). The grain sizes of spinel stays confined in 100 nm range even in the spinel samples diluted with as low as 5 wt% concentration of amorphous SiO2. For the samples with predominant SiO2 the crystalline nanoparticles are well separated and of size of around 100 nm, but with presence of much smaller spinel nanoparticles of about 10 nm. The magnetic properties of the samples with predominant silica phase showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.
T2  - Science of Sintering
T1  - Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4
VL  - 45
IS  - 1
SP  - 69
EP  - 78
DO  - 10.2298/SOS1301069M
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Brankovic, D. and Jović, Nataša G. and Čolović, Božana M. and Čupić, Svetlana D. and Kojić, Dušan",
year = "2013",
abstract = "The magnetic properties of mesoscopic materials are modified by size and surface effects. We present a sol-gel method used to tailor these effects, and illustrate it on Co1+yAl2-yO4 spinel. Nanocomposites made of spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized. Samples with various mass fractions -x of Co1+yAl2-yO4 in composite, ranging from predominantly SiO2 (x = 10 wt%) to predominantly spinel (x = 95 wt%), and with various Co concentrations in spinel y were studied. The spinel grain sizes were below 100 nm with a large size distribution, for samples with predominant spinel phase. Those samples showed Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta approximate to -100 K). The grain sizes of spinel stays confined in 100 nm range even in the spinel samples diluted with as low as 5 wt% concentration of amorphous SiO2. For the samples with predominant SiO2 the crystalline nanoparticles are well separated and of size of around 100 nm, but with presence of much smaller spinel nanoparticles of about 10 nm. The magnetic properties of the samples with predominant silica phase showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.",
journal = "Science of Sintering",
title = "Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4",
volume = "45",
number = "1",
pages = "69-78",
doi = "10.2298/SOS1301069M"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z., Brankovic, D., Jović, N. G., Čolović, B. M., Čupić, S. D.,& Kojić, D.. (2013). Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4. in Science of Sintering, 45(1), 69-78.
https://doi.org/10.2298/SOS1301069M

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Brankovic D, Jović NG, Čolović BM, Čupić SD, Kojić D. Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4. in Science of Sintering. 2013;45(1):69-78.
doi:10.2298/SOS1301069M .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Brankovic, D., Jović, Nataša G., Čolović, Božana M., Čupić, Svetlana D., Kojić, Dušan, "Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4" in Science of Sintering, 45, no. 1 (2013):69-78,
https://doi.org/10.2298/SOS1301069M . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Milivojević, Dušan
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Jović, Nataša G.
AU  - Marinović-Cincović, Milena
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5563
AB  - We present a study of dynamic magnetic properties of superparamagnetic CoFe2O4 nanoparticles of average size 5.9 nm suspended in an organic liquid. The relaxation times of the particle magnetic moments are found to be strongly dependent on the size of the particles, and also considerably dependent on interparticle interactions. Besides the lower frequency peak, an additional much faster relaxation is observed in the frequency dependence of the imaginary part of the ac magnetic susceptibility below the freezing point of the liquid. It is found that a large contribution to the magnetic relaxation of the lower frequency peak originates from the particles of dimensions 6.3-5.1 nm with interparticle interactions in the range 25-82 K, which correspond to nearer-neighbor particles. Much faster relaxation indicates that its significant part arises from the particles of dimensions 5.8-5.0 nm with interactions in the range 1-52 K which include also more distant neighbors. (C) 2013 AIP Publishing LLC.
T2  - Journal of Applied Physics
T1  - Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles
VL  - 113
IS  - 23
DO  - 10.1063/1.4811537
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Milivojević, Dušan and Jagličić, Zvonko and Makovec, Darko and Jović, Nataša G. and Marinović-Cincović, Milena",
year = "2013",
abstract = "We present a study of dynamic magnetic properties of superparamagnetic CoFe2O4 nanoparticles of average size 5.9 nm suspended in an organic liquid. The relaxation times of the particle magnetic moments are found to be strongly dependent on the size of the particles, and also considerably dependent on interparticle interactions. Besides the lower frequency peak, an additional much faster relaxation is observed in the frequency dependence of the imaginary part of the ac magnetic susceptibility below the freezing point of the liquid. It is found that a large contribution to the magnetic relaxation of the lower frequency peak originates from the particles of dimensions 6.3-5.1 nm with interparticle interactions in the range 25-82 K, which correspond to nearer-neighbor particles. Much faster relaxation indicates that its significant part arises from the particles of dimensions 5.8-5.0 nm with interactions in the range 1-52 K which include also more distant neighbors. (C) 2013 AIP Publishing LLC.",
journal = "Journal of Applied Physics",
title = "Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles",
volume = "113",
number = "23",
doi = "10.1063/1.4811537"
}

Babić-Stojić, B. S., Jokanović, V. R., Milivojević, D., Jagličić, Z., Makovec, D., Jović, N. G.,& Marinović-Cincović, M.. (2013). Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles. in Journal of Applied Physics, 113(23).
https://doi.org/10.1063/1.4811537

Babić-Stojić BS, Jokanović VR, Milivojević D, Jagličić Z, Makovec D, Jović NG, Marinović-Cincović M. Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles. in Journal of Applied Physics. 2013;113(23).
doi:10.1063/1.4811537 .

Babić-Stojić, Branka S., Jokanović, Vukoman R., Milivojević, Dušan, Jagličić, Zvonko, Makovec, Darko, Jović, Nataša G., Marinović-Cincović, Milena, "Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles" in Journal of Applied Physics, 113, no. 23 (2013),
https://doi.org/10.1063/1.4811537 . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Milivojević, Dušan
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Jović, Nataša G.
AU  - Marinović-Cincović, Milena
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5773
AB  - We present a study of magnetic and structural properties of CoFe2O4 nanoparticles suspended in an organic liquid. Transmission electron microscopy shows that the nanoparticles have a narrow size distribution of average particle size 5.9 +/- 1.0 nm. X-ray diffraction shows that the particles are of cubic spinel crystal structure. Dynamic light scattering measurements reveal the existence of an organic shell around the CoFe2O4 nanoparticles with an average hydrodynamic diameter of 14.4 nm. Coercive magnetic field at T = 5 K is found to be 11.8 kOe. Disappearance of the coercive field and remanent magnetization at about 170 K suggests that the CoFe2O4 nanoparticles are superparamagnetic at higher temperatures which is confirmed by the room temperature Mossbauer spectrum analysis. Saturation magnetization of the nanoparticles of 80.8 emu/g(CoFe2O4) at 5 K reaches the value detected in the bulk material and remains very high also at room temperature. The cobalt ferrite nanoparticle system synthesized in this work exhibits magnetic properties which are very suitable for various biomedical applications.
T2  - Journal of Nanomaterials
T1  - Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid
SP  - 741036
DO  - 10.1155/2013/741036
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Milivojević, Dušan and Jagličić, Zvonko and Makovec, Darko and Jović, Nataša G. and Marinović-Cincović, Milena",
year = "2013",
abstract = "We present a study of magnetic and structural properties of CoFe2O4 nanoparticles suspended in an organic liquid. Transmission electron microscopy shows that the nanoparticles have a narrow size distribution of average particle size 5.9 +/- 1.0 nm. X-ray diffraction shows that the particles are of cubic spinel crystal structure. Dynamic light scattering measurements reveal the existence of an organic shell around the CoFe2O4 nanoparticles with an average hydrodynamic diameter of 14.4 nm. Coercive magnetic field at T = 5 K is found to be 11.8 kOe. Disappearance of the coercive field and remanent magnetization at about 170 K suggests that the CoFe2O4 nanoparticles are superparamagnetic at higher temperatures which is confirmed by the room temperature Mossbauer spectrum analysis. Saturation magnetization of the nanoparticles of 80.8 emu/g(CoFe2O4) at 5 K reaches the value detected in the bulk material and remains very high also at room temperature. The cobalt ferrite nanoparticle system synthesized in this work exhibits magnetic properties which are very suitable for various biomedical applications.",
journal = "Journal of Nanomaterials",
title = "Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid",
pages = "741036",
doi = "10.1155/2013/741036"
}

Babić-Stojić, B. S., Jokanović, V. R., Milivojević, D., Jagličić, Z., Makovec, D., Jović, N. G.,& Marinović-Cincović, M.. (2013). Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid. in Journal of Nanomaterials, 741036.
https://doi.org/10.1155/2013/741036

Babić-Stojić BS, Jokanović VR, Milivojević D, Jagličić Z, Makovec D, Jović NG, Marinović-Cincović M. Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid. in Journal of Nanomaterials. 2013;:741036.
doi:10.1155/2013/741036 .

Babić-Stojić, Branka S., Jokanović, Vukoman R., Milivojević, Dušan, Jagličić, Zvonko, Makovec, Darko, Jović, Nataša G., Marinović-Cincović, Milena, "Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid" in Journal of Nanomaterials (2013):741036,
https://doi.org/10.1155/2013/741036 . .

TY  - JOUR
AU  - Mraković, Ana Đ.
AU  - Blanuša, Jovan
AU  - Primc, Darinka
AU  - Perović, Marija M.
AU  - Jagličić, Zvonko
AU  - Kusigerski, Vladan
AU  - Spasojević, Vojislav
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5463
AB  - A modified solid-state combustion route was developed for the preparation of nanocrystalline manganite La0.7Ca0.3MnO3 in a single-step process, using metal nitrates and glucose/KNO3 redox mixture. The obtained sample was found to crystallize within O type of orthorhombic perovskite structure (space group Pnma), without the presence of other structural phases or impurities. Nanoparticles are found to have particle size in the range 12-35 nm, and to be highly crystalline without the presence of amorphous surface layer. Magnetic measurements show that nanoparticles display bulk-like magnetic properties, with ferromagnetic phase transition at 125 K and the absence of superparamagnetic or spin-glass behavior. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Modified self-propagating high-temperature synthesis of nanosized La0.7Ca0.3MnO3
VL  - 39
IS  - 4
SP  - 3771
EP  - 3777
DO  - 10.1016/j.ceramint.2012.10.216
ER  - 

@article{
author = "Mraković, Ana Đ. and Blanuša, Jovan and Primc, Darinka and Perović, Marija M. and Jagličić, Zvonko and Kusigerski, Vladan and Spasojević, Vojislav",
year = "2013",
abstract = "A modified solid-state combustion route was developed for the preparation of nanocrystalline manganite La0.7Ca0.3MnO3 in a single-step process, using metal nitrates and glucose/KNO3 redox mixture. The obtained sample was found to crystallize within O type of orthorhombic perovskite structure (space group Pnma), without the presence of other structural phases or impurities. Nanoparticles are found to have particle size in the range 12-35 nm, and to be highly crystalline without the presence of amorphous surface layer. Magnetic measurements show that nanoparticles display bulk-like magnetic properties, with ferromagnetic phase transition at 125 K and the absence of superparamagnetic or spin-glass behavior. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Modified self-propagating high-temperature synthesis of nanosized La0.7Ca0.3MnO3",
volume = "39",
number = "4",
pages = "3771-3777",
doi = "10.1016/j.ceramint.2012.10.216"
}

Mraković, A. Đ., Blanuša, J., Primc, D., Perović, M. M., Jagličić, Z., Kusigerski, V.,& Spasojević, V.. (2013). Modified self-propagating high-temperature synthesis of nanosized La0.7Ca0.3MnO3. in Ceramics International, 39(4), 3771-3777.
https://doi.org/10.1016/j.ceramint.2012.10.216

Mraković AĐ, Blanuša J, Primc D, Perović MM, Jagličić Z, Kusigerski V, Spasojević V. Modified self-propagating high-temperature synthesis of nanosized La0.7Ca0.3MnO3. in Ceramics International. 2013;39(4):3771-3777.
doi:10.1016/j.ceramint.2012.10.216 .

Mraković, Ana Đ., Blanuša, Jovan, Primc, Darinka, Perović, Marija M., Jagličić, Zvonko, Kusigerski, Vladan, Spasojević, Vojislav, "Modified self-propagating high-temperature synthesis of nanosized La0.7Ca0.3MnO3" in Ceramics International, 39, no. 4 (2013):3771-3777,
https://doi.org/10.1016/j.ceramint.2012.10.216 . .

TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Branković, Dušan
AU  - Jović, Nataša G.
AU  - Čupić, Svetlana D.
AU  - Kojić, Dušan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4909
AB  - Nanocomposites made of magnetic spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized by a sol-gel technique. Samples with various mass fractions of Co1+yAl2-yO4 in composite x, and with various Co concentrations in spinel y were studied. The grain sizes were below 100 nm with a large size distribution. The paper represents thorough investigation of magnetic properties, but special attention was given to peculiar effects and low temperature magnetic frozen states. Magnetic measurements reveal multiple magnetic ground states at the lowest temperature. The frequency dependent ac susceptibility measurements indicate spin-glass behavior of these ground states at low temperatures. The samples, with higher concentration x of Co1+yAl2-yO4 in SiO2, showed very similar Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta a parts per thousand -100 K). Other samples, with lower x, showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.
T2  - Journal of Sol-gel Science and Technology
T1  - Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method
VL  - 63
IS  - 1
SP  - 56
EP  - 64
DO  - 10.1007/s10971-012-2763-1
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Branković, Dušan and Jović, Nataša G. and Čupić, Svetlana D. and Kojić, Dušan",
year = "2012",
abstract = "Nanocomposites made of magnetic spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized by a sol-gel technique. Samples with various mass fractions of Co1+yAl2-yO4 in composite x, and with various Co concentrations in spinel y were studied. The grain sizes were below 100 nm with a large size distribution. The paper represents thorough investigation of magnetic properties, but special attention was given to peculiar effects and low temperature magnetic frozen states. Magnetic measurements reveal multiple magnetic ground states at the lowest temperature. The frequency dependent ac susceptibility measurements indicate spin-glass behavior of these ground states at low temperatures. The samples, with higher concentration x of Co1+yAl2-yO4 in SiO2, showed very similar Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta a parts per thousand -100 K). Other samples, with lower x, showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.",
journal = "Journal of Sol-gel Science and Technology",
title = "Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method",
volume = "63",
number = "1",
pages = "56-64",
doi = "10.1007/s10971-012-2763-1"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z., Branković, D., Jović, N. G., Čupić, S. D.,& Kojić, D.. (2012). Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method. in Journal of Sol-gel Science and Technology, 63(1), 56-64.
https://doi.org/10.1007/s10971-012-2763-1

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Branković D, Jović NG, Čupić SD, Kojić D. Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method. in Journal of Sol-gel Science and Technology. 2012;63(1):56-64.
doi:10.1007/s10971-012-2763-1 .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Branković, Dušan, Jović, Nataša G., Čupić, Svetlana D., Kojić, Dušan, "Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method" in Journal of Sol-gel Science and Technology, 63, no. 1 (2012):56-64,
https://doi.org/10.1007/s10971-012-2763-1 . .

TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6924
AB  - Samples of Mn-doped amorphous SiO2 matrix with manganese concentration 0.7 and 3 at.% have been prepared by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10 - 20 nm in size. Two types of Mn-rich particles are dispersed in silica matrix, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility reveals that dominant magnetic phase at higher temperatures is lambda-MnO2. At temperatures below T-C = 43 K strong ferrimagnetism originating from the minor Mn3O4 phase masks the relatively weak magnetism of lambda-MnO2. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the AC magnetic susceptibility in the sample with 3 at.% Mn suggest that the magnetic moments of the smaller Mn3O4 nanoparticles with dimensions below 10 nm are subject to thermally activated blocking process just below the Curie temperature T-C. The low-temperature maximum in the zero-field-cooled magnetization observed for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments in the geometrically frustrated Mn sublattice of the lambda-MnO2 crystal structure.
T2  - Acta Physica Polonica A
T1  - Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix
VL  - 120
IS  - 2
SP  - 316
EP  - 321
DO  - 10.12693/APhysPolA.120.316
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Makovec, Darko",
year = "2011",
abstract = "Samples of Mn-doped amorphous SiO2 matrix with manganese concentration 0.7 and 3 at.% have been prepared by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10 - 20 nm in size. Two types of Mn-rich particles are dispersed in silica matrix, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility reveals that dominant magnetic phase at higher temperatures is lambda-MnO2. At temperatures below T-C = 43 K strong ferrimagnetism originating from the minor Mn3O4 phase masks the relatively weak magnetism of lambda-MnO2. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the AC magnetic susceptibility in the sample with 3 at.% Mn suggest that the magnetic moments of the smaller Mn3O4 nanoparticles with dimensions below 10 nm are subject to thermally activated blocking process just below the Curie temperature T-C. The low-temperature maximum in the zero-field-cooled magnetization observed for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments in the geometrically frustrated Mn sublattice of the lambda-MnO2 crystal structure.",
journal = "Acta Physica Polonica A",
title = "Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix",
volume = "120",
number = "2",
pages = "316-321",
doi = "10.12693/APhysPolA.120.316"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z.,& Makovec, D.. (2011). Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix. in Acta Physica Polonica A, 120(2), 316-321.
https://doi.org/10.12693/APhysPolA.120.316

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Makovec D. Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix. in Acta Physica Polonica A. 2011;120(2):316-321.
doi:10.12693/APhysPolA.120.316 .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Makovec, Darko, "Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix" in Acta Physica Polonica A, 120, no. 2 (2011):316-321,
https://doi.org/10.12693/APhysPolA.120.316 . .

TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4177
AB  - Samples of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix with manganese concentration 0.7 and 3 at% have been synthesized by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10-20 nm in size. Insilica matrix two types of Mn-rich particles are dispersed, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High temperature magnetic susceptibility study reveals that dominant magnetic phase at higher temperatures is lambda-MnO2. At temperatures below T-C = 43 K strong ferrimagnetism originating from the minor Mn3O4 phase masks the relatively weak magnetism of lambda-MnO2 with antiferromagnetic interactions. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the ac magnetic susceptibility in the sample with 3 at% Mn suggest that the magnetic moments of the smaller Mn3O4 nanoparticles with dimensions below 10 nm are exposed to thermally activated blocking process just below the Curie temperature T-C. Appearance of a maximum in the zero-field-cooled magnetization for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments at low temperatures which might occur in the geometrically frustrated Mn sublattice of the lambda-MnO2 crystal structure. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Magnetism and Magnetic Materials
T1  - Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix
VL  - 323
IS  - 6
SP  - 805
EP  - 812
DO  - 10.1016/j.jmmm.2010.11.002
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Makovec, Darko",
year = "2011",
abstract = "Samples of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix with manganese concentration 0.7 and 3 at% have been synthesized by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10-20 nm in size. Insilica matrix two types of Mn-rich particles are dispersed, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High temperature magnetic susceptibility study reveals that dominant magnetic phase at higher temperatures is lambda-MnO2. At temperatures below T-C = 43 K strong ferrimagnetism originating from the minor Mn3O4 phase masks the relatively weak magnetism of lambda-MnO2 with antiferromagnetic interactions. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the ac magnetic susceptibility in the sample with 3 at% Mn suggest that the magnetic moments of the smaller Mn3O4 nanoparticles with dimensions below 10 nm are exposed to thermally activated blocking process just below the Curie temperature T-C. Appearance of a maximum in the zero-field-cooled magnetization for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments at low temperatures which might occur in the geometrically frustrated Mn sublattice of the lambda-MnO2 crystal structure. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix",
volume = "323",
number = "6",
pages = "805-812",
doi = "10.1016/j.jmmm.2010.11.002"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z.,& Makovec, D.. (2011). Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix. in Journal of Magnetism and Magnetic Materials, 323(6), 805-812.
https://doi.org/10.1016/j.jmmm.2010.11.002

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Makovec D. Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix. in Journal of Magnetism and Magnetic Materials. 2011;323(6):805-812.
doi:10.1016/j.jmmm.2010.11.002 .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Makovec, Darko, "Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix" in Journal of Magnetism and Magnetic Materials, 323, no. 6 (2011):805-812,
https://doi.org/10.1016/j.jmmm.2010.11.002 . .

TY  - JOUR
AU  - Jović, Nataša G.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Branković, Dušan
AU  - Milosavljević, Momir
AU  - Makovec, Darko
AU  - Babić-Stojić, Branka S.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4081
AB  - Nanocomposite made of 10 wt% of Co2.4Al0.6O4 particles dispersed in an amorphous SiO2 matrix has been synthesized by a solgel method. X-ray diffraction, transmission electron microscopy and magnetic measurements have been used to characterize the properties of nanocomposite. Most of the particles are well crystallized and have an average diameter below 100 nm. Smaller particles with size below 10 nm have also been observed. A large value of the effective magnetic moment per Co2+ ion of 5.08 mu B and negative and the low CurieWeiss paramagnetic temperature Theta similar to -6 K, obtained from the high-temperature susceptibility data, indicate a possible mixing of Co2+ and Co3+ ions between tetrahedral and octahedral sites of the spinel crystal lattice. The measurements of static and dynamic magnetic susceptibilities have shown that Co2.4Al0.6O4 particles in SiO2 matrix display a spin glass behavior at low temperatures. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Magnetism and Magnetic Materials
T1  - Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method
VL  - 322
IS  - 21
SP  - 3271
EP  - 3277
DO  - 10.1016/j.jmmm.2010.06.006
ER  - 

@article{
author = "Jović, Nataša G. and Jokanović, Vukoman R. and Jagličić, Zvonko and Branković, Dušan and Milosavljević, Momir and Makovec, Darko and Babić-Stojić, Branka S.",
year = "2010",
abstract = "Nanocomposite made of 10 wt% of Co2.4Al0.6O4 particles dispersed in an amorphous SiO2 matrix has been synthesized by a solgel method. X-ray diffraction, transmission electron microscopy and magnetic measurements have been used to characterize the properties of nanocomposite. Most of the particles are well crystallized and have an average diameter below 100 nm. Smaller particles with size below 10 nm have also been observed. A large value of the effective magnetic moment per Co2+ ion of 5.08 mu B and negative and the low CurieWeiss paramagnetic temperature Theta similar to -6 K, obtained from the high-temperature susceptibility data, indicate a possible mixing of Co2+ and Co3+ ions between tetrahedral and octahedral sites of the spinel crystal lattice. The measurements of static and dynamic magnetic susceptibilities have shown that Co2.4Al0.6O4 particles in SiO2 matrix display a spin glass behavior at low temperatures. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method",
volume = "322",
number = "21",
pages = "3271-3277",
doi = "10.1016/j.jmmm.2010.06.006"
}

Jović, N. G., Jokanović, V. R., Jagličić, Z., Branković, D., Milosavljević, M., Makovec, D.,& Babić-Stojić, B. S.. (2010). Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method. in Journal of Magnetism and Magnetic Materials, 322(21), 3271-3277.
https://doi.org/10.1016/j.jmmm.2010.06.006

Jović NG, Jokanović VR, Jagličić Z, Branković D, Milosavljević M, Makovec D, Babić-Stojić BS. Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method. in Journal of Magnetism and Magnetic Materials. 2010;322(21):3271-3277.
doi:10.1016/j.jmmm.2010.06.006 .

Jović, Nataša G., Jokanović, Vukoman R., Jagličić, Zvonko, Branković, Dušan, Milosavljević, Momir, Makovec, Darko, Babić-Stojić, Branka S., "Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method" in Journal of Magnetism and Magnetic Materials, 322, no. 21 (2010):3271-3277,
https://doi.org/10.1016/j.jmmm.2010.06.006 . .

TY  - JOUR
AU  - Blinc, R.
AU  - Cevc, P.
AU  - Potocnik, A.
AU  - Zemva, B.
AU  - Goreshnik, E.
AU  - Hanžel, Darko
AU  - Gregorovic, A.
AU  - Trontelj, Z.
AU  - Jagličić, Zvonko
AU  - Laguta, V.
AU  - Perović, Marija M.
AU  - Dalal, N. S.
AU  - Scott, J. F.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3920
AB  - The local electronic and structural as well as the macroscopic magnetic properties of K3Cr2Fe3F15 have been studied between room temperature and 4 K. The system has been found to be isostructural with ferroelectric and weakly ferrimagnetic K3Fe5F15 above the ferroelectric transition temperature T-c. The X-band and 216 GHz Cr3+ electron paramagnetic resonance (EPR) spectra as well as the magnetic susceptibility and Moumlssbauer data show the existence of two magnetic relaxor type transitions around 37 and 17 K. The K-39 magic angle sample spinning NMR, EPR, and the Moumlssbauer data further demonstrate the existence of two nonequivalent Fe, Cr, and K sites in the unit cell as well as the presence of rapid exchange at higher temperatures. The observation of the Fe2+ EPR and Moumlssbauer spectra shows that the Fe2+ ion is in a high spin state.
T2  - Journal of Applied Physics
T1  - Magnetic properties of multiferroic K3Cr2Fe3F15
VL  - 107
IS  - 4
DO  - 10.1063/1.3309205
ER  - 

@article{
author = "Blinc, R. and Cevc, P. and Potocnik, A. and Zemva, B. and Goreshnik, E. and Hanžel, Darko and Gregorovic, A. and Trontelj, Z. and Jagličić, Zvonko and Laguta, V. and Perović, Marija M. and Dalal, N. S. and Scott, J. F.",
year = "2010",
abstract = "The local electronic and structural as well as the macroscopic magnetic properties of K3Cr2Fe3F15 have been studied between room temperature and 4 K. The system has been found to be isostructural with ferroelectric and weakly ferrimagnetic K3Fe5F15 above the ferroelectric transition temperature T-c. The X-band and 216 GHz Cr3+ electron paramagnetic resonance (EPR) spectra as well as the magnetic susceptibility and Moumlssbauer data show the existence of two magnetic relaxor type transitions around 37 and 17 K. The K-39 magic angle sample spinning NMR, EPR, and the Moumlssbauer data further demonstrate the existence of two nonequivalent Fe, Cr, and K sites in the unit cell as well as the presence of rapid exchange at higher temperatures. The observation of the Fe2+ EPR and Moumlssbauer spectra shows that the Fe2+ ion is in a high spin state.",
journal = "Journal of Applied Physics",
title = "Magnetic properties of multiferroic K3Cr2Fe3F15",
volume = "107",
number = "4",
doi = "10.1063/1.3309205"
}

Blinc, R., Cevc, P., Potocnik, A., Zemva, B., Goreshnik, E., Hanžel, D., Gregorovic, A., Trontelj, Z., Jagličić, Z., Laguta, V., Perović, M. M., Dalal, N. S.,& Scott, J. F.. (2010). Magnetic properties of multiferroic K3Cr2Fe3F15. in Journal of Applied Physics, 107(4).
https://doi.org/10.1063/1.3309205

Blinc R, Cevc P, Potocnik A, Zemva B, Goreshnik E, Hanžel D, Gregorovic A, Trontelj Z, Jagličić Z, Laguta V, Perović MM, Dalal NS, Scott JF. Magnetic properties of multiferroic K3Cr2Fe3F15. in Journal of Applied Physics. 2010;107(4).
doi:10.1063/1.3309205 .

Blinc, R., Cevc, P., Potocnik, A., Zemva, B., Goreshnik, E., Hanžel, Darko, Gregorovic, A., Trontelj, Z., Jagličić, Zvonko, Laguta, V., Perović, Marija M., Dalal, N. S., Scott, J. F., "Magnetic properties of multiferroic K3Cr2Fe3F15" in Journal of Applied Physics, 107, no. 4 (2010),
https://doi.org/10.1063/1.3309205 . .

TY  - JOUR
AU  - Marković, Dragana
AU  - Kusigerski, Vladan
AU  - Tadić, Marin
AU  - Blanuša, Jovan
AU  - Jagličić, Zvonko
AU  - Cvjetićanin, Nikola
AU  - Spasojević, Vojislav
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3975
AB  - The influence of the heat treatment on the structural and magnetic properties of the nanoparticle La0.7Ca0.3MnO3 compound has been studied. The starting single-phase sample was prepared by the glycine nitrate method without additional heating. The as-prepared specimen has been afterward annealed at two different temperatures of 600 C and 900 degrees C. All three samples where characterized by XRPD, SEM and TEM, as well as by the SQUID magnetometry. Rietveld analysis of the XRPD data showed the orthorhombic perovskite structure (space group Prima) of all the samples, while the unit cell parameters underwent a contraction with the annealing temperature. The influence of the heat treatment on the crystal structure is to decrease the orthorhombic distortion by changing the geometrical parameters. The TEM micrographs showed the increase of the mean particle size with annealing temperature from 10 nm up to 50 nm. DC magnetization and AC susceptibility measurements revealed the change of magnetic properties with the increase of the particle size: both para-to-ferromagnetic transition temperature T-C and saturation magnetization M-S were shifted to higher values with the simultaneous decrease of the coercivity H-C. In addition, annealing procedure suppresses the spin-glass-like state that emerges in the as-prepared sample below T-f = 95K. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - The influence of the heat treatment on the structural and magnetic properties of nanoparticle La0.7Ca0.3MnO3 prepared by glycine-nitrate method
VL  - 494
IS  - 1-2
SP  - 52
EP  - 57
DO  - 10.1016/j.jallcom.2010.01.062
ER  - 

@article{
author = "Marković, Dragana and Kusigerski, Vladan and Tadić, Marin and Blanuša, Jovan and Jagličić, Zvonko and Cvjetićanin, Nikola and Spasojević, Vojislav",
year = "2010",
abstract = "The influence of the heat treatment on the structural and magnetic properties of the nanoparticle La0.7Ca0.3MnO3 compound has been studied. The starting single-phase sample was prepared by the glycine nitrate method without additional heating. The as-prepared specimen has been afterward annealed at two different temperatures of 600 C and 900 degrees C. All three samples where characterized by XRPD, SEM and TEM, as well as by the SQUID magnetometry. Rietveld analysis of the XRPD data showed the orthorhombic perovskite structure (space group Prima) of all the samples, while the unit cell parameters underwent a contraction with the annealing temperature. The influence of the heat treatment on the crystal structure is to decrease the orthorhombic distortion by changing the geometrical parameters. The TEM micrographs showed the increase of the mean particle size with annealing temperature from 10 nm up to 50 nm. DC magnetization and AC susceptibility measurements revealed the change of magnetic properties with the increase of the particle size: both para-to-ferromagnetic transition temperature T-C and saturation magnetization M-S were shifted to higher values with the simultaneous decrease of the coercivity H-C. In addition, annealing procedure suppresses the spin-glass-like state that emerges in the as-prepared sample below T-f = 95K. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "The influence of the heat treatment on the structural and magnetic properties of nanoparticle La0.7Ca0.3MnO3 prepared by glycine-nitrate method",
volume = "494",
number = "1-2",
pages = "52-57",
doi = "10.1016/j.jallcom.2010.01.062"
}

Marković, D., Kusigerski, V., Tadić, M., Blanuša, J., Jagličić, Z., Cvjetićanin, N.,& Spasojević, V.. (2010). The influence of the heat treatment on the structural and magnetic properties of nanoparticle La0.7Ca0.3MnO3 prepared by glycine-nitrate method. in Journal of Alloys and Compounds, 494(1-2), 52-57.
https://doi.org/10.1016/j.jallcom.2010.01.062

Marković D, Kusigerski V, Tadić M, Blanuša J, Jagličić Z, Cvjetićanin N, Spasojević V. The influence of the heat treatment on the structural and magnetic properties of nanoparticle La0.7Ca0.3MnO3 prepared by glycine-nitrate method. in Journal of Alloys and Compounds. 2010;494(1-2):52-57.
doi:10.1016/j.jallcom.2010.01.062 .

Marković, Dragana, Kusigerski, Vladan, Tadić, Marin, Blanuša, Jovan, Jagličić, Zvonko, Cvjetićanin, Nikola, Spasojević, Vojislav, "The influence of the heat treatment on the structural and magnetic properties of nanoparticle La0.7Ca0.3MnO3 prepared by glycine-nitrate method" in Journal of Alloys and Compounds, 494, no. 1-2 (2010):52-57,
https://doi.org/10.1016/j.jallcom.2010.01.062 . .

TY  - JOUR
AU  - Brankovic, D.
AU  - Jokanović, Vukoman R.
AU  - Babić-Stojić, Branka S.
AU  - Jagličić, Zvonko
AU  - Lisjak, Darja
AU  - Kojić, Dušan
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3635
AB  - An inhomogeneous system of aggregates of Co3O4 nanocrystallites dispersed in an amorphous SiO2 matrix has been studied. X-ray diffraction and atomic force microscopy reveal a bimodal distribution of crystallite sizes, smaller nanocrystallites with dimension below 10 nm and larger nanocrystallites of about 20 nm. The Co3O4 nanocrystallites enter the composition of nanograins with dimension 20-60 nm. The nanograins build aggregates with dimension 200-500 nm. A large value of the effective magnetic moment per Co2+ ion obtained from the high-temperature susceptibility measurements indicates possible disturbance of the normal spinel structure in which a fraction of Co3+ ions also possesses magnetic moment. An analysis based on the temperature dependence of the coercive field has shown that the smaller nanocrystallites behave as superparamagnetic particles with a blocking temperature of about 10 K. Simultaneous existence of two relaxation processes is observed in the frequency dependence of the imaginary part of the ac magnetic susceptibility in the vicinity of T = 15.8 K. The temperature dependence of the width of the distribution function of relaxation times obtained from the Cole-Cole diagrams exhibits behaviour characteristic for spin glass dynamics in a temperature range above 17.6 K and is temperature independent below 15.8 K, which is a property of superparamagnetic particles. The variation of the width of the distribution function between 17.6 and 15.8 K indicates that interference of the superparamagnetic and spin glass dynamics occurs. It has been found that average relaxation time increases with decreasing temperature from tau(c) LT 10(-4) s at 17.6 K to 1.5 x 10(-1) s at 15 K. The increase of the average relaxation time with decreasing temperature, the observed blocking temperature of the superparamagnetic moments at about 10 K and interference appearing between the two spin dynamics suggest that the magnetic moments in the smaller as well as in the larger nanocrystallites are subject to a thermally activated blocking process at low temperatures.
T2  - Journal of Physics: Condensed Matter
T1  - Interference effect between superparamagnetic and spin glass correlated moments in a system of dispersed Co3O4 nanocrystallites
VL  - 21
IS  - 9
DO  - 10.1088/0953-8984/21/9/095303
ER  - 

@article{
author = "Brankovic, D. and Jokanović, Vukoman R. and Babić-Stojić, Branka S. and Jagličić, Zvonko and Lisjak, Darja and Kojić, Dušan",
year = "2009",
abstract = "An inhomogeneous system of aggregates of Co3O4 nanocrystallites dispersed in an amorphous SiO2 matrix has been studied. X-ray diffraction and atomic force microscopy reveal a bimodal distribution of crystallite sizes, smaller nanocrystallites with dimension below 10 nm and larger nanocrystallites of about 20 nm. The Co3O4 nanocrystallites enter the composition of nanograins with dimension 20-60 nm. The nanograins build aggregates with dimension 200-500 nm. A large value of the effective magnetic moment per Co2+ ion obtained from the high-temperature susceptibility measurements indicates possible disturbance of the normal spinel structure in which a fraction of Co3+ ions also possesses magnetic moment. An analysis based on the temperature dependence of the coercive field has shown that the smaller nanocrystallites behave as superparamagnetic particles with a blocking temperature of about 10 K. Simultaneous existence of two relaxation processes is observed in the frequency dependence of the imaginary part of the ac magnetic susceptibility in the vicinity of T = 15.8 K. The temperature dependence of the width of the distribution function of relaxation times obtained from the Cole-Cole diagrams exhibits behaviour characteristic for spin glass dynamics in a temperature range above 17.6 K and is temperature independent below 15.8 K, which is a property of superparamagnetic particles. The variation of the width of the distribution function between 17.6 and 15.8 K indicates that interference of the superparamagnetic and spin glass dynamics occurs. It has been found that average relaxation time increases with decreasing temperature from tau(c) LT 10(-4) s at 17.6 K to 1.5 x 10(-1) s at 15 K. The increase of the average relaxation time with decreasing temperature, the observed blocking temperature of the superparamagnetic moments at about 10 K and interference appearing between the two spin dynamics suggest that the magnetic moments in the smaller as well as in the larger nanocrystallites are subject to a thermally activated blocking process at low temperatures.",
journal = "Journal of Physics: Condensed Matter",
title = "Interference effect between superparamagnetic and spin glass correlated moments in a system of dispersed Co3O4 nanocrystallites",
volume = "21",
number = "9",
doi = "10.1088/0953-8984/21/9/095303"
}

Brankovic, D., Jokanović, V. R., Babić-Stojić, B. S., Jagličić, Z., Lisjak, D.,& Kojić, D.. (2009). Interference effect between superparamagnetic and spin glass correlated moments in a system of dispersed Co3O4 nanocrystallites. in Journal of Physics: Condensed Matter, 21(9).
https://doi.org/10.1088/0953-8984/21/9/095303

Brankovic D, Jokanović VR, Babić-Stojić BS, Jagličić Z, Lisjak D, Kojić D. Interference effect between superparamagnetic and spin glass correlated moments in a system of dispersed Co3O4 nanocrystallites. in Journal of Physics: Condensed Matter. 2009;21(9).
doi:10.1088/0953-8984/21/9/095303 .

Brankovic, D., Jokanović, Vukoman R., Babić-Stojić, Branka S., Jagličić, Zvonko, Lisjak, Darja, Kojić, Dušan, "Interference effect between superparamagnetic and spin glass correlated moments in a system of dispersed Co3O4 nanocrystallites" in Journal of Physics: Condensed Matter, 21, no. 9 (2009),
https://doi.org/10.1088/0953-8984/21/9/095303 . .

TY  - JOUR
AU  - Mitrić, Miodrag
AU  - Blanuša, Jovan
AU  - Barudžija, Tanja
AU  - Jagličić, Zvonko
AU  - Kusigerski, Vladan
AU  - Spasojević, Vojislav
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3818
AB  - Polycrystailline samples of the cubic SmxY2-xO3 solid solutions (x = 0 2, 0.5. 1 0, 1 4, 1.7 and 2.0) were prepared and analyzed by the XRD and magnetic susceptibility measurements. Random distribution of Sm3+ ions between 24d and 8b site was found. except for diluted samples (x = 0.2 and 0 5). where Sm3+ ions preferentially occupy 24d site. The susceptibility data was analyzed within 2-150 K range according to the second order perturbation (Van Vleck equation) The strength of exchange interactions was estimated from low-temperature susceptibility within 2-20 K (effective g-value and Curie-Weiss temperature) The effective g-value and the Curie-Weiss temperature theta for Sm2O3 were found to be 0.451 and -3.97 K, respectively (C) 2009 Elsevier B V. All rights reserved
T2  - Journal of Alloys and Compounds
T1  - Magnetic properties of trivalent Sm ions in SmxY2-xO3
VL  - 485
IS  - 1-2
SP  - 473
EP  - 477
DO  - 10.1016/j.jallcom.2009.05.142
ER  - 

@article{
author = "Mitrić, Miodrag and Blanuša, Jovan and Barudžija, Tanja and Jagličić, Zvonko and Kusigerski, Vladan and Spasojević, Vojislav",
year = "2009",
abstract = "Polycrystailline samples of the cubic SmxY2-xO3 solid solutions (x = 0 2, 0.5. 1 0, 1 4, 1.7 and 2.0) were prepared and analyzed by the XRD and magnetic susceptibility measurements. Random distribution of Sm3+ ions between 24d and 8b site was found. except for diluted samples (x = 0.2 and 0 5). where Sm3+ ions preferentially occupy 24d site. The susceptibility data was analyzed within 2-150 K range according to the second order perturbation (Van Vleck equation) The strength of exchange interactions was estimated from low-temperature susceptibility within 2-20 K (effective g-value and Curie-Weiss temperature) The effective g-value and the Curie-Weiss temperature theta for Sm2O3 were found to be 0.451 and -3.97 K, respectively (C) 2009 Elsevier B V. All rights reserved",
journal = "Journal of Alloys and Compounds",
title = "Magnetic properties of trivalent Sm ions in SmxY2-xO3",
volume = "485",
number = "1-2",
pages = "473-477",
doi = "10.1016/j.jallcom.2009.05.142"
}

Mitrić, M., Blanuša, J., Barudžija, T., Jagličić, Z., Kusigerski, V.,& Spasojević, V.. (2009). Magnetic properties of trivalent Sm ions in SmxY2-xO3. in Journal of Alloys and Compounds, 485(1-2), 473-477.
https://doi.org/10.1016/j.jallcom.2009.05.142

Mitrić M, Blanuša J, Barudžija T, Jagličić Z, Kusigerski V, Spasojević V. Magnetic properties of trivalent Sm ions in SmxY2-xO3. in Journal of Alloys and Compounds. 2009;485(1-2):473-477.
doi:10.1016/j.jallcom.2009.05.142 .

Mitrić, Miodrag, Blanuša, Jovan, Barudžija, Tanja, Jagličić, Zvonko, Kusigerski, Vladan, Spasojević, Vojislav, "Magnetic properties of trivalent Sm ions in SmxY2-xO3" in Journal of Alloys and Compounds, 485, no. 1-2 (2009):473-477,
https://doi.org/10.1016/j.jallcom.2009.05.142 . .