TY  - JOUR
AU  - Concas, Giorgio
AU  - Congiu, Francesco
AU  - Muscas, Giuseppe
AU  - Peddis, Davide
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1674
AB  - We studied the temperature,dependence of the magnetization in an ensemble of monodomain nanoparticles both with dc magnetometry and Mossbauer spectroscopy. The analytical form of the temperature dependence is given by the complementary cumulative distribution function. This allows to determine the magnetization blocking temperatures of the sample by a fitting procedure. It is possible to calculate the Mossbauer blocking temperature by a single spectrum and the dc magnetization blocking temperature by, two points of the thermoremanent magnetization curve, thus with a large reduction of the experimental work. The method may be used for particles with not too strong interactions, such happens in the Fe28 sample and not for samples with strong interactions as N30; it may be used for interparticle interaction energies up to 2 yJ and not for energies larger than 60 yJ. This method of analysis of the data should be used in the future work concerning the thermoremanent magnetization and Mossbauer spectra of magnetic nanoparticles.
T2  - Journal of Physical Chemistry. C
T1  - Determination of Blocking Temperature in Magnetization and Mossbauer Time Scale: A Functional Form Approach
VL  - 121
IS  - 30
SP  - 16541
EP  - 16548
DO  - 10.1021/acs.jpcc.7b01748
ER  - 

@article{
author = "Concas, Giorgio and Congiu, Francesco and Muscas, Giuseppe and Peddis, Davide",
year = "2017",
abstract = "We studied the temperature,dependence of the magnetization in an ensemble of monodomain nanoparticles both with dc magnetometry and Mossbauer spectroscopy. The analytical form of the temperature dependence is given by the complementary cumulative distribution function. This allows to determine the magnetization blocking temperatures of the sample by a fitting procedure. It is possible to calculate the Mossbauer blocking temperature by a single spectrum and the dc magnetization blocking temperature by, two points of the thermoremanent magnetization curve, thus with a large reduction of the experimental work. The method may be used for particles with not too strong interactions, such happens in the Fe28 sample and not for samples with strong interactions as N30; it may be used for interparticle interaction energies up to 2 yJ and not for energies larger than 60 yJ. This method of analysis of the data should be used in the future work concerning the thermoremanent magnetization and Mossbauer spectra of magnetic nanoparticles.",
journal = "Journal of Physical Chemistry. C",
title = "Determination of Blocking Temperature in Magnetization and Mossbauer Time Scale: A Functional Form Approach",
volume = "121",
number = "30",
pages = "16541-16548",
doi = "10.1021/acs.jpcc.7b01748"
}

Concas, G., Congiu, F., Muscas, G.,& Peddis, D.. (2017). Determination of Blocking Temperature in Magnetization and Mossbauer Time Scale: A Functional Form Approach. in Journal of Physical Chemistry. C, 121(30), 16541-16548.
https://doi.org/10.1021/acs.jpcc.7b01748

Concas G, Congiu F, Muscas G, Peddis D. Determination of Blocking Temperature in Magnetization and Mossbauer Time Scale: A Functional Form Approach. in Journal of Physical Chemistry. C. 2017;121(30):16541-16548.
doi:10.1021/acs.jpcc.7b01748 .

Concas, Giorgio, Congiu, Francesco, Muscas, Giuseppe, Peddis, Davide, "Determination of Blocking Temperature in Magnetization and Mossbauer Time Scale: A Functional Form Approach" in Journal of Physical Chemistry. C, 121, no. 30 (2017):16541-16548,
https://doi.org/10.1021/acs.jpcc.7b01748 . .

TY  - JOUR
AU  - Concas, Giorgio
AU  - Congiu, Francesco
AU  - Belošević-Čavor, Jelena
AU  - Cekić, Midar
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3280
AB  - Magnetic measurements of molar susceptibilities as a function of temperature in the temperature range between 5 and 400 K were performed for the intermetallic compounds Hf2Co and HfCo2, using a SQUID magnetometer. The density of states at the Fermi level for Hf2Co was evaluated from the measured spin paramagnetic susceptibility. In addition, band structure calculations using the augmented plane waves plus local orbitals (APW+1o) method as implemented in the WIEN2k programme package for the two compounds were done. The obtained results were compared with the measured data.
T2  - Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences
T1  - Magnetic properties and electronic structures of compounds from the Hf-Co phase system
VL  - 62
IS  - 7-8
SP  - 452
EP  - 456
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3280
ER  - 

@article{
author = "Concas, Giorgio and Congiu, Francesco and Belošević-Čavor, Jelena and Cekić, Midar",
year = "2007",
abstract = "Magnetic measurements of molar susceptibilities as a function of temperature in the temperature range between 5 and 400 K were performed for the intermetallic compounds Hf2Co and HfCo2, using a SQUID magnetometer. The density of states at the Fermi level for Hf2Co was evaluated from the measured spin paramagnetic susceptibility. In addition, band structure calculations using the augmented plane waves plus local orbitals (APW+1o) method as implemented in the WIEN2k programme package for the two compounds were done. The obtained results were compared with the measured data.",
journal = "Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences",
title = "Magnetic properties and electronic structures of compounds from the Hf-Co phase system",
volume = "62",
number = "7-8",
pages = "452-456",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3280"
}

Concas, G., Congiu, F., Belošević-Čavor, J.,& Cekić, M.. (2007). Magnetic properties and electronic structures of compounds from the Hf-Co phase system. in Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences, 62(7-8), 452-456.
https://hdl.handle.net/21.15107/rcub_vinar_3280

Concas G, Congiu F, Belošević-Čavor J, Cekić M. Magnetic properties and electronic structures of compounds from the Hf-Co phase system. in Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences. 2007;62(7-8):452-456.
https://hdl.handle.net/21.15107/rcub_vinar_3280 .

Concas, Giorgio, Congiu, Francesco, Belošević-Čavor, Jelena, Cekić, Midar, "Magnetic properties and electronic structures of compounds from the Hf-Co phase system" in Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences, 62, no. 7-8 (2007):452-456,
https://hdl.handle.net/21.15107/rcub_vinar_3280 .

TY  - JOUR
AU  - Belošević-Čavor, Jelena
AU  - Congiu, Francesco
AU  - Koteski, Vasil J.
AU  - Cekić, Božidar Đ.
AU  - Concas, Giorgio
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6609
AB  - Magnetization M as a function of applied magnetic field H up to 50 kOe was measured at low temperature T = 5K, using an SQUID magnetometer, for HfCo2 and Hf2Co intermetallic compounds. Both samples showed paramagnetic behaviour with a weak ferromagnetic contribution due to impurities (0.01-0.001 wt%). The values of the mass susceptibilities chi were deduced from the measurements. In addition, calculations using full-potential linearized augmented plane wave (FP-LAPW) WIEN 97 programme package were done, in order to check their agreement with the experimental results.
T2  - Materials Science Forum
T1  - Magnetism of the compounds in the Hf-co phase system
VL  - 518
SP  - 319
EP  - 324
DO  - 10.4028/www.scientific.net/MSF.518.319
ER  - 

@article{
author = "Belošević-Čavor, Jelena and Congiu, Francesco and Koteski, Vasil J. and Cekić, Božidar Đ. and Concas, Giorgio",
year = "2006",
abstract = "Magnetization M as a function of applied magnetic field H up to 50 kOe was measured at low temperature T = 5K, using an SQUID magnetometer, for HfCo2 and Hf2Co intermetallic compounds. Both samples showed paramagnetic behaviour with a weak ferromagnetic contribution due to impurities (0.01-0.001 wt%). The values of the mass susceptibilities chi were deduced from the measurements. In addition, calculations using full-potential linearized augmented plane wave (FP-LAPW) WIEN 97 programme package were done, in order to check their agreement with the experimental results.",
journal = "Materials Science Forum",
title = "Magnetism of the compounds in the Hf-co phase system",
volume = "518",
pages = "319-324",
doi = "10.4028/www.scientific.net/MSF.518.319"
}

Belošević-Čavor, J., Congiu, F., Koteski, V. J., Cekić, B. Đ.,& Concas, G.. (2006). Magnetism of the compounds in the Hf-co phase system. in Materials Science Forum, 518, 319-324.
https://doi.org/10.4028/www.scientific.net/MSF.518.319

Belošević-Čavor J, Congiu F, Koteski VJ, Cekić BĐ, Concas G. Magnetism of the compounds in the Hf-co phase system. in Materials Science Forum. 2006;518:319-324.
doi:10.4028/www.scientific.net/MSF.518.319 .

Belošević-Čavor, Jelena, Congiu, Francesco, Koteski, Vasil J., Cekić, Božidar Đ., Concas, Giorgio, "Magnetism of the compounds in the Hf-co phase system" in Materials Science Forum, 518 (2006):319-324,
https://doi.org/10.4028/www.scientific.net/MSF.518.319 . .

TY  - JOUR
AU  - Belošević-Čavor, Jelena
AU  - Koteski, Vasil J.
AU  - Novaković, Nikola
AU  - Concas, G
AU  - Congiu, F
AU  - Spano, G
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3014
AB  - The magnetic properties and hyperfine interaction parameters for Laves phase HfFe2 with C14 type structure are studied using SQUID magnetometer and Mossbauer measurement. The saturation magnetization, remanent magnetization, coercive field, magnetic moment per unit formula and the hyperfine magnetic field at Fe site are reported. In addition, a detailed theoretical study of the electronic structure and hyperfine magnetic fields of the two possible HfFe2 structures, C15 and C14, is presented. Using the full-potential linearized augmented plane wave (FP-LAPW) method as implemented in the WIEN 97 package, the equilibrium volume, bulk moduli, magnetic moments and hyperfine magnetic fields for the two structures are calculated. The obtained results are compared with the measured data.
T2  - European Physical Journal B. Condensed Matter and Complex Systems
T1  - Magnetic properties, Mossbauer effect and first principle calculations study of laves phase HfFe2
VL  - 50
IS  - 3
SP  - 425
EP  - 430
DO  - 10.1140/epjb/e2006-00160-7
ER  - 

@article{
author = "Belošević-Čavor, Jelena and Koteski, Vasil J. and Novaković, Nikola and Concas, G and Congiu, F and Spano, G",
year = "2006",
abstract = "The magnetic properties and hyperfine interaction parameters for Laves phase HfFe2 with C14 type structure are studied using SQUID magnetometer and Mossbauer measurement. The saturation magnetization, remanent magnetization, coercive field, magnetic moment per unit formula and the hyperfine magnetic field at Fe site are reported. In addition, a detailed theoretical study of the electronic structure and hyperfine magnetic fields of the two possible HfFe2 structures, C15 and C14, is presented. Using the full-potential linearized augmented plane wave (FP-LAPW) method as implemented in the WIEN 97 package, the equilibrium volume, bulk moduli, magnetic moments and hyperfine magnetic fields for the two structures are calculated. The obtained results are compared with the measured data.",
journal = "European Physical Journal B. Condensed Matter and Complex Systems",
title = "Magnetic properties, Mossbauer effect and first principle calculations study of laves phase HfFe2",
volume = "50",
number = "3",
pages = "425-430",
doi = "10.1140/epjb/e2006-00160-7"
}

Belošević-Čavor, J., Koteski, V. J., Novaković, N., Concas, G., Congiu, F.,& Spano, G.. (2006). Magnetic properties, Mossbauer effect and first principle calculations study of laves phase HfFe2. in European Physical Journal B. Condensed Matter and Complex Systems, 50(3), 425-430.
https://doi.org/10.1140/epjb/e2006-00160-7

Belošević-Čavor J, Koteski VJ, Novaković N, Concas G, Congiu F, Spano G. Magnetic properties, Mossbauer effect and first principle calculations study of laves phase HfFe2. in European Physical Journal B. Condensed Matter and Complex Systems. 2006;50(3):425-430.
doi:10.1140/epjb/e2006-00160-7 .

Belošević-Čavor, Jelena, Koteski, Vasil J., Novaković, Nikola, Concas, G, Congiu, F, Spano, G, "Magnetic properties, Mossbauer effect and first principle calculations study of laves phase HfFe2" in European Physical Journal B. Condensed Matter and Complex Systems, 50, no. 3 (2006):425-430,
https://doi.org/10.1140/epjb/e2006-00160-7 . .

TY  - JOUR
AU  - Belošević-Čavor, Jelena
AU  - Koteski, Vasil J.
AU  - Concas, G
AU  - Cekić, Božidar Đ.
AU  - Novaković, Nikola
AU  - Spano, G
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2962
AB  - A detailed theoretical study of the structure, electronic properties and the electric field gradients of the Hf2Fe intermetallic compound is presented. Using all-electron full-potential linearized augmented plane wave (FP-LAPW) formalism the equilibrium volume, bulk modulus and electric field gradients are calculated. The obtained results are compared with EFG values inferred from measurements performed using Mossbauer spectroscopy and the earlier reported time differential perturbed angular correlation (TDPAC) measurements. The lattice relaxation and the supercell calculations are found to be essential for the correct interpretation of the experimental results. (c) 2005 Elsevier Ltd. All rights reserved.
T2  - Journal of Physics and Chemistry of Solids
T1  - Mossbauer effect and first principle calculations of the electronic structure and hyperfine interaction parameters of Hf2Fe
VL  - 66
IS  - 10
SP  - 1815
EP  - 1819
DO  - 10.1016/j.jpcs.2005.09.003
ER  - 

@article{
author = "Belošević-Čavor, Jelena and Koteski, Vasil J. and Concas, G and Cekić, Božidar Đ. and Novaković, Nikola and Spano, G",
year = "2005",
abstract = "A detailed theoretical study of the structure, electronic properties and the electric field gradients of the Hf2Fe intermetallic compound is presented. Using all-electron full-potential linearized augmented plane wave (FP-LAPW) formalism the equilibrium volume, bulk modulus and electric field gradients are calculated. The obtained results are compared with EFG values inferred from measurements performed using Mossbauer spectroscopy and the earlier reported time differential perturbed angular correlation (TDPAC) measurements. The lattice relaxation and the supercell calculations are found to be essential for the correct interpretation of the experimental results. (c) 2005 Elsevier Ltd. All rights reserved.",
journal = "Journal of Physics and Chemistry of Solids",
title = "Mossbauer effect and first principle calculations of the electronic structure and hyperfine interaction parameters of Hf2Fe",
volume = "66",
number = "10",
pages = "1815-1819",
doi = "10.1016/j.jpcs.2005.09.003"
}

Belošević-Čavor, J., Koteski, V. J., Concas, G., Cekić, B. Đ., Novaković, N.,& Spano, G.. (2005). Mossbauer effect and first principle calculations of the electronic structure and hyperfine interaction parameters of Hf2Fe. in Journal of Physics and Chemistry of Solids, 66(10), 1815-1819.
https://doi.org/10.1016/j.jpcs.2005.09.003

Belošević-Čavor J, Koteski VJ, Concas G, Cekić BĐ, Novaković N, Spano G. Mossbauer effect and first principle calculations of the electronic structure and hyperfine interaction parameters of Hf2Fe. in Journal of Physics and Chemistry of Solids. 2005;66(10):1815-1819.
doi:10.1016/j.jpcs.2005.09.003 .

Belošević-Čavor, Jelena, Koteski, Vasil J., Concas, G, Cekić, Božidar Đ., Novaković, Nikola, Spano, G, "Mossbauer effect and first principle calculations of the electronic structure and hyperfine interaction parameters of Hf2Fe" in Journal of Physics and Chemistry of Solids, 66, no. 10 (2005):1815-1819,
https://doi.org/10.1016/j.jpcs.2005.09.003 . .