TY  - JOUR
AU  - Kasiuk, J.
AU  - Fedotova, J.
AU  - Przewoznik, J.
AU  - Kapusta, Cz.
AU  - Skuratov, Vladimir A.
AU  - Milosavljević, Momir
AU  - Bondariev, V.
AU  - Koltunowicz, T. N.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7087
AB  - The paper reports on the results of structural analysis and magnetometry of granular nanocomposite films FeCoZr-CaF2 irradiated with Xe and Kr ions at different fluences. The observed effect of enhanced perpendicular magnetic anisotropy characterizing pristine films is discussed with respect to the irradiation regimes and structural changes of the films originating from the impact of ions.
T2  - Acta Physica Polonica A
T1  - Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF2 Nanocomposite Films
VL  - 128
IS  - 5
SP  - 828
EP  - 831
DO  - 10.12693/APhysPolA.128.828
ER  - 

@article{
author = "Kasiuk, J. and Fedotova, J. and Przewoznik, J. and Kapusta, Cz. and Skuratov, Vladimir A. and Milosavljević, Momir and Bondariev, V. and Koltunowicz, T. N.",
year = "2015",
abstract = "The paper reports on the results of structural analysis and magnetometry of granular nanocomposite films FeCoZr-CaF2 irradiated with Xe and Kr ions at different fluences. The observed effect of enhanced perpendicular magnetic anisotropy characterizing pristine films is discussed with respect to the irradiation regimes and structural changes of the films originating from the impact of ions.",
journal = "Acta Physica Polonica A",
title = "Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF2 Nanocomposite Films",
volume = "128",
number = "5",
pages = "828-831",
doi = "10.12693/APhysPolA.128.828"
}

Kasiuk, J., Fedotova, J., Przewoznik, J., Kapusta, Cz., Skuratov, V. A., Milosavljević, M., Bondariev, V.,& Koltunowicz, T. N.. (2015). Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF2 Nanocomposite Films. in Acta Physica Polonica A, 128(5), 828-831.
https://doi.org/10.12693/APhysPolA.128.828

Kasiuk J, Fedotova J, Przewoznik J, Kapusta C, Skuratov VA, Milosavljević M, Bondariev V, Koltunowicz TN. Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF2 Nanocomposite Films. in Acta Physica Polonica A. 2015;128(5):828-831.
doi:10.12693/APhysPolA.128.828 .

Kasiuk, J., Fedotova, J., Przewoznik, J., Kapusta, Cz., Skuratov, Vladimir A., Milosavljević, Momir, Bondariev, V., Koltunowicz, T. N., "Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF2 Nanocomposite Films" in Acta Physica Polonica A, 128, no. 5 (2015):828-831,
https://doi.org/10.12693/APhysPolA.128.828 . .

TY  - JOUR
AU  - Kasiuk, J. V.
AU  - Fedotova, J. A.
AU  - Przewoznik, J.
AU  - Zukrowski, J.
AU  - Sikora, M.
AU  - Kapusta, Cz
AU  - Grce, Ana
AU  - Milosavljević, Momir
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/77
AB  - The relation between nanoscale structure, local atomic order and magnetic properties of (FeCoZr)(x)(CaF2)(100-x) (29 LT = x LT = 73 at. %) granular films is studied as a function of metal/insulator fraction ratio. The films of a thickness of 1-6 mu m were deposited on Al-foils and glass-ceramic substrates, by ion sputtering of targets of different metal/insulator contents. Structural characterization with X-ray and electron diffraction as well as transmission electron microscopy revealed that the films are composed of isolated nanocrystalline bcc alpha-FeCo(Zr) alloy and insulating fcc CaF2 matrix. They grow in a columnar structure, where elongated metallic nanograins are arranged on top of each other within the columns almost normal to the substrate surface. Mossbauer spectroscopy and magnetometry results indicate that their easy magnetization axes are oriented at an angle of 65 degrees-74 degrees to the surface in films with x between 46 and 74, above the electrical percolation threshold, which is attributed to the growth-induced shape anisotropy. Interatomic distances characteristic for metallic state of alpha-FeCo(Zr) nanograins were revealed by X-ray Absorption Spectroscopy. The results show a lack of surface oxidation of the alloy nanograins, so the growth-induced orientation of nanograins in the films cannot be attributed to this effect. The study is among the first to report a growth-induced non-planar magnetic anisotropy in metal/insulator granular films above the percolation threshold and to reveal the origin of it. (C) 2014 AIP Publishing LLC.
T2  - Journal of Applied Physics
T1  - Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization
VL  - 116
IS  - 4
DO  - 10.1063/1.4891016
ER  - 

@article{
author = "Kasiuk, J. V. and Fedotova, J. A. and Przewoznik, J. and Zukrowski, J. and Sikora, M. and Kapusta, Cz and Grce, Ana and Milosavljević, Momir",
year = "2014",
abstract = "The relation between nanoscale structure, local atomic order and magnetic properties of (FeCoZr)(x)(CaF2)(100-x) (29 LT = x LT = 73 at. %) granular films is studied as a function of metal/insulator fraction ratio. The films of a thickness of 1-6 mu m were deposited on Al-foils and glass-ceramic substrates, by ion sputtering of targets of different metal/insulator contents. Structural characterization with X-ray and electron diffraction as well as transmission electron microscopy revealed that the films are composed of isolated nanocrystalline bcc alpha-FeCo(Zr) alloy and insulating fcc CaF2 matrix. They grow in a columnar structure, where elongated metallic nanograins are arranged on top of each other within the columns almost normal to the substrate surface. Mossbauer spectroscopy and magnetometry results indicate that their easy magnetization axes are oriented at an angle of 65 degrees-74 degrees to the surface in films with x between 46 and 74, above the electrical percolation threshold, which is attributed to the growth-induced shape anisotropy. Interatomic distances characteristic for metallic state of alpha-FeCo(Zr) nanograins were revealed by X-ray Absorption Spectroscopy. The results show a lack of surface oxidation of the alloy nanograins, so the growth-induced orientation of nanograins in the films cannot be attributed to this effect. The study is among the first to report a growth-induced non-planar magnetic anisotropy in metal/insulator granular films above the percolation threshold and to reveal the origin of it. (C) 2014 AIP Publishing LLC.",
journal = "Journal of Applied Physics",
title = "Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization",
volume = "116",
number = "4",
doi = "10.1063/1.4891016"
}

Kasiuk, J. V., Fedotova, J. A., Przewoznik, J., Zukrowski, J., Sikora, M., Kapusta, C., Grce, A.,& Milosavljević, M.. (2014). Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization. in Journal of Applied Physics, 116(4).
https://doi.org/10.1063/1.4891016

Kasiuk JV, Fedotova JA, Przewoznik J, Zukrowski J, Sikora M, Kapusta C, Grce A, Milosavljević M. Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization. in Journal of Applied Physics. 2014;116(4).
doi:10.1063/1.4891016 .

Kasiuk, J. V., Fedotova, J. A., Przewoznik, J., Zukrowski, J., Sikora, M., Kapusta, Cz, Grce, Ana, Milosavljević, Momir, "Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization" in Journal of Applied Physics, 116, no. 4 (2014),
https://doi.org/10.1063/1.4891016 . .

TY  - CONF
AU  - Fedotova, J.
AU  - Kasiuk, J.
AU  - Milosavljević, Momir
AU  - Przewoznik, J.
AU  - Kapusta, Cz.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7031
AB  - The paper summarizes features in magnetic states of nanocomposite films like superparamagnetic relaxation, exchange interactions, enhanced magnetic anisotropy, originating from their granular nanostructure and related to various combinations of metallic (FeCo(Zr) alloy) nanoparticles and insulating (Al2O3, PbZrTiO3, CaF2) matrix as well as films deposition regimes.
C3  - Physics, Chemistry and Applications of Nanostructures: Reviews and Short Notes
T1  - Nanoscale Characterization of Self-Ordered Metal-Insulator Nanostructured Magnetic Films
SP  - 50
EP  - 53
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7031
ER  - 

@conference{
author = "Fedotova, J. and Kasiuk, J. and Milosavljević, Momir and Przewoznik, J. and Kapusta, Cz.",
year = "2013",
abstract = "The paper summarizes features in magnetic states of nanocomposite films like superparamagnetic relaxation, exchange interactions, enhanced magnetic anisotropy, originating from their granular nanostructure and related to various combinations of metallic (FeCo(Zr) alloy) nanoparticles and insulating (Al2O3, PbZrTiO3, CaF2) matrix as well as films deposition regimes.",
journal = "Physics, Chemistry and Applications of Nanostructures: Reviews and Short Notes",
title = "Nanoscale Characterization of Self-Ordered Metal-Insulator Nanostructured Magnetic Films",
pages = "50-53",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7031"
}

Fedotova, J., Kasiuk, J., Milosavljević, M., Przewoznik, J.,& Kapusta, Cz.. (2013). Nanoscale Characterization of Self-Ordered Metal-Insulator Nanostructured Magnetic Films. in Physics, Chemistry and Applications of Nanostructures: Reviews and Short Notes, 50-53.
https://hdl.handle.net/21.15107/rcub_vinar_7031

Fedotova J, Kasiuk J, Milosavljević M, Przewoznik J, Kapusta C. Nanoscale Characterization of Self-Ordered Metal-Insulator Nanostructured Magnetic Films. in Physics, Chemistry and Applications of Nanostructures: Reviews and Short Notes. 2013;:50-53.
https://hdl.handle.net/21.15107/rcub_vinar_7031 .

Fedotova, J., Kasiuk, J., Milosavljević, Momir, Przewoznik, J., Kapusta, Cz., "Nanoscale Characterization of Self-Ordered Metal-Insulator Nanostructured Magnetic Films" in Physics, Chemistry and Applications of Nanostructures: Reviews and Short Notes (2013):50-53,
https://hdl.handle.net/21.15107/rcub_vinar_7031 .

TY  - JOUR
AU  - Fedotova, J. A.
AU  - Przewoznik, J.
AU  - Kapusta, Cz
AU  - Milosavljević, Momir
AU  - Kasiuk, J. V.
AU  - Zukrowski, J.
AU  - Sikora, M.
AU  - Maximenko, A. A.
AU  - Szepietowska, D.
AU  - Homewood, Kevin P.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4609
AB  - Temperature and magnetic field dependences of electrical conductivity are systematically studied in granular films (Fe45Co45Zr10)(x)(Al2O3)(100-x) (28 LT = x LT = 64) containing crystalline metallic alpha-FeCo-based nanoalloy cores encapsulated in an amorphous oxide shell embedded in an amorphous Al2O3 matrix. Formation of metallic core-oxide shell nanogranules is confirmed by transmission electron microscopy (TEM) and HRTEM. The structure of core and shell is governed with the difference in the oxidation states of Fe and Co ions investigated with EXAFS, XANES and Mossbauer spectroscopy. A considerable negative magnetoresistance (MR) effect of spin-dependent nature is observed in the whole range of x values. Its increase with decreasing temperature is correlated with the magnetic saturation of superparamagnetic metallic nanogranules. The enhanced MR effect in core-shell granular films is related to the percolation of oxide shells and their influence through spin filtering processes. A considerable high field MR at low temperatures and the resulting deviation of MR and squared magnetization are attributed to a magnetic randomness and/or strong magnetic anisotropy of the magnetic oxide shell.
T2  - Journal of Physics. D: Applied Physics
T1  - Magnetoresistance in FeCoZr-Al2O3 nanocomposite films containing metal core-oxide shell nanogranules
VL  - 44
IS  - 49
DO  - 10.1088/0022-3727/44/49/495001
ER  - 

@article{
author = "Fedotova, J. A. and Przewoznik, J. and Kapusta, Cz and Milosavljević, Momir and Kasiuk, J. V. and Zukrowski, J. and Sikora, M. and Maximenko, A. A. and Szepietowska, D. and Homewood, Kevin P.",
year = "2011",
abstract = "Temperature and magnetic field dependences of electrical conductivity are systematically studied in granular films (Fe45Co45Zr10)(x)(Al2O3)(100-x) (28 LT = x LT = 64) containing crystalline metallic alpha-FeCo-based nanoalloy cores encapsulated in an amorphous oxide shell embedded in an amorphous Al2O3 matrix. Formation of metallic core-oxide shell nanogranules is confirmed by transmission electron microscopy (TEM) and HRTEM. The structure of core and shell is governed with the difference in the oxidation states of Fe and Co ions investigated with EXAFS, XANES and Mossbauer spectroscopy. A considerable negative magnetoresistance (MR) effect of spin-dependent nature is observed in the whole range of x values. Its increase with decreasing temperature is correlated with the magnetic saturation of superparamagnetic metallic nanogranules. The enhanced MR effect in core-shell granular films is related to the percolation of oxide shells and their influence through spin filtering processes. A considerable high field MR at low temperatures and the resulting deviation of MR and squared magnetization are attributed to a magnetic randomness and/or strong magnetic anisotropy of the magnetic oxide shell.",
journal = "Journal of Physics. D: Applied Physics",
title = "Magnetoresistance in FeCoZr-Al2O3 nanocomposite films containing metal core-oxide shell nanogranules",
volume = "44",
number = "49",
doi = "10.1088/0022-3727/44/49/495001"
}

Fedotova, J. A., Przewoznik, J., Kapusta, C., Milosavljević, M., Kasiuk, J. V., Zukrowski, J., Sikora, M., Maximenko, A. A., Szepietowska, D.,& Homewood, K. P.. (2011). Magnetoresistance in FeCoZr-Al2O3 nanocomposite films containing metal core-oxide shell nanogranules. in Journal of Physics. D: Applied Physics, 44(49).
https://doi.org/10.1088/0022-3727/44/49/495001

Fedotova JA, Przewoznik J, Kapusta C, Milosavljević M, Kasiuk JV, Zukrowski J, Sikora M, Maximenko AA, Szepietowska D, Homewood KP. Magnetoresistance in FeCoZr-Al2O3 nanocomposite films containing metal core-oxide shell nanogranules. in Journal of Physics. D: Applied Physics. 2011;44(49).
doi:10.1088/0022-3727/44/49/495001 .

Fedotova, J. A., Przewoznik, J., Kapusta, Cz, Milosavljević, Momir, Kasiuk, J. V., Zukrowski, J., Sikora, M., Maximenko, A. A., Szepietowska, D., Homewood, Kevin P., "Magnetoresistance in FeCoZr-Al2O3 nanocomposite films containing metal core-oxide shell nanogranules" in Journal of Physics. D: Applied Physics, 44, no. 49 (2011),
https://doi.org/10.1088/0022-3727/44/49/495001 . .