TY  - JOUR
AU  - Zentková, M.
AU  - Kovalik, M.
AU  - Mihalik, M.
AU  - Csach, K.
AU  - Gamzatov, A.G.
AU  - Aliev, A.M.
AU  - Iľkovič, S.
AU  - Fitta, M.
AU  - Perović, Marija M.
AU  - Mihalik, M.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10129
AB  - Experimental study of magnetocaloric effect (MCE) was performed by direct and indirect methods on La0.70Ag0.25MnO3+δ nanoparticles with rhombohedral LaAlO3 – type crystal structure (R3¯c space group – No. 167, hP30). The content of oxygen was modified by annealing at 800 °C/48h in different atmosphere (air, O2 and Ar). The Curie temperature TC increases from 250 K to 319.5 K and to 322.9 K with the content of oxygen. The adiabatic temperature change ΔT(4T) = 1.52 K, the change of magnetic entropy −ΔSmax(4T) = 3.96 Jkg−1K−1 and the relative cooling power RCT(4T) = 172 J/kg are maximal for sample treated in Ar and decrease with oxygen content. The frequency dependence of ΔT (f) and the shape of maximum in ΔT (T) and −ΔSmax (T) indicate relaxation processes and presence of magnetic inhomogeneities which are present mostly in sample treated in Ar. The samples demonstrate the stability of the MCE up to 1000 cycles of switching on and off the magnetic field without any signs of degradation
T2  - Journal of Magnetism and Magnetic Materials
T1  - Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles
VL  - 549
SP  - 169002
DO  - 10.1016/j.jmmm.2021.169002
ER  - 

@article{
author = "Zentková, M. and Kovalik, M. and Mihalik, M. and Csach, K. and Gamzatov, A.G. and Aliev, A.M. and Iľkovič, S. and Fitta, M. and Perović, Marija M. and Mihalik, M.",
year = "2022",
abstract = "Experimental study of magnetocaloric effect (MCE) was performed by direct and indirect methods on La0.70Ag0.25MnO3+δ nanoparticles with rhombohedral LaAlO3 – type crystal structure (R3¯c space group – No. 167, hP30). The content of oxygen was modified by annealing at 800 °C/48h in different atmosphere (air, O2 and Ar). The Curie temperature TC increases from 250 K to 319.5 K and to 322.9 K with the content of oxygen. The adiabatic temperature change ΔT(4T) = 1.52 K, the change of magnetic entropy −ΔSmax(4T) = 3.96 Jkg−1K−1 and the relative cooling power RCT(4T) = 172 J/kg are maximal for sample treated in Ar and decrease with oxygen content. The frequency dependence of ΔT (f) and the shape of maximum in ΔT (T) and −ΔSmax (T) indicate relaxation processes and presence of magnetic inhomogeneities which are present mostly in sample treated in Ar. The samples demonstrate the stability of the MCE up to 1000 cycles of switching on and off the magnetic field without any signs of degradation",
journal = "Journal of Magnetism and Magnetic Materials",
title = "Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles",
volume = "549",
pages = "169002",
doi = "10.1016/j.jmmm.2021.169002"
}

Zentková, M., Kovalik, M., Mihalik, M., Csach, K., Gamzatov, A.G., Aliev, A.M., Iľkovič, S., Fitta, M., Perović, M. M.,& Mihalik, M.. (2022). Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles. in Journal of Magnetism and Magnetic Materials, 549, 169002.
https://doi.org/10.1016/j.jmmm.2021.169002

Zentková M, Kovalik M, Mihalik M, Csach K, Gamzatov A, Aliev A, Iľkovič S, Fitta M, Perović MM, Mihalik M. Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles. in Journal of Magnetism and Magnetic Materials. 2022;549:169002.
doi:10.1016/j.jmmm.2021.169002 .

Zentková, M., Kovalik, M., Mihalik, M., Csach, K., Gamzatov, A.G., Aliev, A.M., Iľkovič, S., Fitta, M., Perović, Marija M., Mihalik, M., "Magnetocaloric effect in La0.70Ag0.25MnO3+δ magnetic nanoparticles" in Journal of Magnetism and Magnetic Materials, 549 (2022):169002,
https://doi.org/10.1016/j.jmmm.2021.169002 . .

TY  - JOUR
AU  - Zentkova, M.
AU  - Mihalik, Marian
AU  - Mihalik, Jr., M.
AU  - Kovalik, M
AU  - Perović, Marija M.
AU  - Vavra, M.
AU  - Briančin, J.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9085
AB  - Annealing of_ non stoichiometric La0.80Ag0.15MnO3 nanoparticles leads to the change of the crystal symmetry from Pnma to R3c and to almost doubling of its Curie temperature from 117 K to 317 K. This effect is due to the releasing of lattice distortions and strengthening of double exchange interaction. The large values of the magnetocaloric entropy of the order of ∆S = 6.19 J/(kg K) were observedat ∆µ0H = 5 T and T = 315 K.
T2  - Acta Physica Polonica A
T1  - Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles
VL  - 137
IS  - 5
SP  - 900
EP  - 903
DO  - 10.12693/APhysPolA.137.900
ER  - 

@article{
author = "Zentkova, M. and Mihalik, Marian and Mihalik, Jr., M. and Kovalik, M and Perović, Marija M. and Vavra, M. and Briančin, J.",
year = "2020",
abstract = "Annealing of_ non stoichiometric La0.80Ag0.15MnO3 nanoparticles leads to the change of the crystal symmetry from Pnma to R3c and to almost doubling of its Curie temperature from 117 K to 317 K. This effect is due to the releasing of lattice distortions and strengthening of double exchange interaction. The large values of the magnetocaloric entropy of the order of ∆S = 6.19 J/(kg K) were observedat ∆µ0H = 5 T and T = 315 K.",
journal = "Acta Physica Polonica A",
title = "Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles",
volume = "137",
number = "5",
pages = "900-903",
doi = "10.12693/APhysPolA.137.900"
}

Zentkova, M., Mihalik, M., Mihalik, Jr., M., Kovalik, M., Perović, M. M., Vavra, M.,& Briančin, J.. (2020). Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles. in Acta Physica Polonica A, 137(5), 900-903.
https://doi.org/10.12693/APhysPolA.137.900

Zentkova M, Mihalik M, Mihalik JM, Kovalik M, Perović MM, Vavra M, Briančin J. Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles. in Acta Physica Polonica A. 2020;137(5):900-903.
doi:10.12693/APhysPolA.137.900 .

Zentkova, M., Mihalik, Marian, Mihalik, Jr., M., Kovalik, M, Perović, Marija M., Vavra, M., Briančin, J., "Crystal Structure and Magnetocaloric Effect of La0.80Ag0.15MnO3 Nanoparticles" in Acta Physica Polonica A, 137, no. 5 (2020):900-903,
https://doi.org/10.12693/APhysPolA.137.900 . .

TY  - JOUR
AU  - Perović, Marija M.
AU  - Kusigerski, Vladan
AU  - Spasojević, Vojislav
AU  - Mraković, Ana Đ.
AU  - Blanuša, Jovan
AU  - Zentkova, M.
AU  - Mihalik, M.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5395
AB  - In this paper, we present the results of a systematic study of nonequilibrium dynamics in a strongly interacting super spin glass (SSG) nanoparticle La0.7Ca0.3MnO3 system by alternating current (ac) susceptibility measurements. Cole-Cole analysis of the obtained data revealed the simultaneous existence of two separated relaxation processes, which can be assigned to the relaxation of different magnetic entities. Along with the expected relaxation of the collective SSG phase, the existence of individual, nonagglomerated particles, which do not take part in the collective phase and relax independently, was proposed. A full dynamical scaling analysis was performed in order to elucidate the nature of the transition to a low-temperature SSG state in the interacting La0.7Ca0.3MnO3 nanoparticle sample.
T2  - Journal of Physics. D: Applied Physics
T1  - An ac susceptibility study of spin dynamics in a super spin glass nanoparticle La0.7Ca0.3MnO3 system: simultaneous relaxation processes
VL  - 46
IS  - 16
DO  - 10.1088/0022-3727/46/16/165001
ER  - 

@article{
author = "Perović, Marija M. and Kusigerski, Vladan and Spasojević, Vojislav and Mraković, Ana Đ. and Blanuša, Jovan and Zentkova, M. and Mihalik, M.",
year = "2013",
abstract = "In this paper, we present the results of a systematic study of nonequilibrium dynamics in a strongly interacting super spin glass (SSG) nanoparticle La0.7Ca0.3MnO3 system by alternating current (ac) susceptibility measurements. Cole-Cole analysis of the obtained data revealed the simultaneous existence of two separated relaxation processes, which can be assigned to the relaxation of different magnetic entities. Along with the expected relaxation of the collective SSG phase, the existence of individual, nonagglomerated particles, which do not take part in the collective phase and relax independently, was proposed. A full dynamical scaling analysis was performed in order to elucidate the nature of the transition to a low-temperature SSG state in the interacting La0.7Ca0.3MnO3 nanoparticle sample.",
journal = "Journal of Physics. D: Applied Physics",
title = "An ac susceptibility study of spin dynamics in a super spin glass nanoparticle La0.7Ca0.3MnO3 system: simultaneous relaxation processes",
volume = "46",
number = "16",
doi = "10.1088/0022-3727/46/16/165001"
}

Perović, M. M., Kusigerski, V., Spasojević, V., Mraković, A. Đ., Blanuša, J., Zentkova, M.,& Mihalik, M.. (2013). An ac susceptibility study of spin dynamics in a super spin glass nanoparticle La0.7Ca0.3MnO3 system: simultaneous relaxation processes. in Journal of Physics. D: Applied Physics, 46(16).
https://doi.org/10.1088/0022-3727/46/16/165001

Perović MM, Kusigerski V, Spasojević V, Mraković AĐ, Blanuša J, Zentkova M, Mihalik M. An ac susceptibility study of spin dynamics in a super spin glass nanoparticle La0.7Ca0.3MnO3 system: simultaneous relaxation processes. in Journal of Physics. D: Applied Physics. 2013;46(16).
doi:10.1088/0022-3727/46/16/165001 .

Perović, Marija M., Kusigerski, Vladan, Spasojević, Vojislav, Mraković, Ana Đ., Blanuša, Jovan, Zentkova, M., Mihalik, M., "An ac susceptibility study of spin dynamics in a super spin glass nanoparticle La0.7Ca0.3MnO3 system: simultaneous relaxation processes" in Journal of Physics. D: Applied Physics, 46, no. 16 (2013),
https://doi.org/10.1088/0022-3727/46/16/165001 . .

TY  - JOUR
AU  - Kusigerski, Vladan
AU  - Perović, Marija M.
AU  - Mraković, Ana Đ.
AU  - Blanuša, Jovan
AU  - Mihalik, M.
AU  - Zentkova, M.
AU  - Spasojević, Vojislav
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6895
AB  - Nanoparticle La0 7Ca0 3Mn0 7Fe0 3O3 with the average particle size of 10 nm was mechanochemically synthesized in the single-step procedure Temperature and field dependences of magnetization were recorded under both ambient and applied hydrostatic pressure up to 0 47 GPa At ambient pressure, two magnetic transition points were observed one of the spin-glass like type at the temperature T-f approximate to 34 K, and ferro-to-paramagnet transition at T-C approximate to 51 K Under the applied pressure magnetic parameters gradually changed (i) both T-C and T-f were lowered with the increase in pressure, (ii) both high field magnetization M-5T and remanent magnetization M-Rem decreased with pressure, (iii) coercivity H increased with pressure The obtained results show that magnetism of a nanoparticle system with high degree of Intrinsic disorder diminishes with the applied pressure that is in compliance with the effect of the increased cationic disorder (internal pressure) in bulk manganites
T2  - Acta Physica Polonica A
T1  - Magnetism of Nanoparticle La0 7Ca0 3Mn0 7Fe0 3O3 under Applied Hydrostatic Pressure
VL  - 118
IS  - 5
SP  - 811
EP  - 812
DO  - 10.12693/APhysPolA.118.811
ER  - 

@article{
author = "Kusigerski, Vladan and Perović, Marija M. and Mraković, Ana Đ. and Blanuša, Jovan and Mihalik, M. and Zentkova, M. and Spasojević, Vojislav",
year = "2010",
abstract = "Nanoparticle La0 7Ca0 3Mn0 7Fe0 3O3 with the average particle size of 10 nm was mechanochemically synthesized in the single-step procedure Temperature and field dependences of magnetization were recorded under both ambient and applied hydrostatic pressure up to 0 47 GPa At ambient pressure, two magnetic transition points were observed one of the spin-glass like type at the temperature T-f approximate to 34 K, and ferro-to-paramagnet transition at T-C approximate to 51 K Under the applied pressure magnetic parameters gradually changed (i) both T-C and T-f were lowered with the increase in pressure, (ii) both high field magnetization M-5T and remanent magnetization M-Rem decreased with pressure, (iii) coercivity H increased with pressure The obtained results show that magnetism of a nanoparticle system with high degree of Intrinsic disorder diminishes with the applied pressure that is in compliance with the effect of the increased cationic disorder (internal pressure) in bulk manganites",
journal = "Acta Physica Polonica A",
title = "Magnetism of Nanoparticle La0 7Ca0 3Mn0 7Fe0 3O3 under Applied Hydrostatic Pressure",
volume = "118",
number = "5",
pages = "811-812",
doi = "10.12693/APhysPolA.118.811"
}

Kusigerski, V., Perović, M. M., Mraković, A. Đ., Blanuša, J., Mihalik, M., Zentkova, M.,& Spasojević, V.. (2010). Magnetism of Nanoparticle La0 7Ca0 3Mn0 7Fe0 3O3 under Applied Hydrostatic Pressure. in Acta Physica Polonica A, 118(5), 811-812.
https://doi.org/10.12693/APhysPolA.118.811

Kusigerski V, Perović MM, Mraković AĐ, Blanuša J, Mihalik M, Zentkova M, Spasojević V. Magnetism of Nanoparticle La0 7Ca0 3Mn0 7Fe0 3O3 under Applied Hydrostatic Pressure. in Acta Physica Polonica A. 2010;118(5):811-812.
doi:10.12693/APhysPolA.118.811 .

Kusigerski, Vladan, Perović, Marija M., Mraković, Ana Đ., Blanuša, Jovan, Mihalik, M., Zentkova, M., Spasojević, Vojislav, "Magnetism of Nanoparticle La0 7Ca0 3Mn0 7Fe0 3O3 under Applied Hydrostatic Pressure" in Acta Physica Polonica A, 118, no. 5 (2010):811-812,
https://doi.org/10.12693/APhysPolA.118.811 . .

TY  - JOUR
AU  - Kusigerski, Vladan
AU  - Marković, D.
AU  - Spasojević, Vojislav
AU  - Tadić, Marin
AU  - Zentkova, M.
AU  - Mihalik, M.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3983
AB  - Pressure effects on magnetic properties of two La0.7Ca0.3MnO3 nanoparticle samples with different mean particle sizes were investigated. Both the samples were prepared by the glycine-nitrate method: sample S-as-prepared (10 nm), and sample S-900-subsequently annealed at 900 A degrees C for 2 h (50 nm). Magnetization measurements revealed remarkable differences in magnetic properties with the applied pressure up to 0.75 GPa: (i) for S sample, both transition temperatures, para-to-ferromagnetic T (C) = 120 K and spin-glass-like transition T (f) = 102 K, decrease with the pressure with the respective pressure coefficients dT (C)/dP = -2.9 K/GPa and dT (f)/dP = -4.4 K/GPa; (ii) for S-900 sample, para-to-ferromagnetic transition temperature T (C) = 261 K increases with pressure with the pressure coefficient dT (C)/dP = 14.8 K/GPa. At the same time, saturation magnetization M (S) recorded at 10 K decreases/increases with pressure for S/S-900 sample, respectively. Explanation of these unusual pressure effects on the magnetism of sample S is proposed within the scenario of the combined contributions of two types of disorders present in the system: surface disorder introduced by the particle shell, and structural disorder of the particle core caused by the prominent Jahn-Teller distortion. Both disorders tend to vanish with the annealing of the system (i.e., with the nanoparticle growth), and so the behavior of the sample S-900 is similar to that previously observed for the bulk counterpart.
T2  - Journal of Nanoparticle Research
T1  - Magnetic properties of nanoparticle La0.7Ca0.3MnO3 under applied hydrostatic pressure
VL  - 12
IS  - 4
SP  - 1299
EP  - 1306
DO  - 10.1007/s11051-010-9852-2
ER  - 

@article{
author = "Kusigerski, Vladan and Marković, D. and Spasojević, Vojislav and Tadić, Marin and Zentkova, M. and Mihalik, M.",
year = "2010",
abstract = "Pressure effects on magnetic properties of two La0.7Ca0.3MnO3 nanoparticle samples with different mean particle sizes were investigated. Both the samples were prepared by the glycine-nitrate method: sample S-as-prepared (10 nm), and sample S-900-subsequently annealed at 900 A degrees C for 2 h (50 nm). Magnetization measurements revealed remarkable differences in magnetic properties with the applied pressure up to 0.75 GPa: (i) for S sample, both transition temperatures, para-to-ferromagnetic T (C) = 120 K and spin-glass-like transition T (f) = 102 K, decrease with the pressure with the respective pressure coefficients dT (C)/dP = -2.9 K/GPa and dT (f)/dP = -4.4 K/GPa; (ii) for S-900 sample, para-to-ferromagnetic transition temperature T (C) = 261 K increases with pressure with the pressure coefficient dT (C)/dP = 14.8 K/GPa. At the same time, saturation magnetization M (S) recorded at 10 K decreases/increases with pressure for S/S-900 sample, respectively. Explanation of these unusual pressure effects on the magnetism of sample S is proposed within the scenario of the combined contributions of two types of disorders present in the system: surface disorder introduced by the particle shell, and structural disorder of the particle core caused by the prominent Jahn-Teller distortion. Both disorders tend to vanish with the annealing of the system (i.e., with the nanoparticle growth), and so the behavior of the sample S-900 is similar to that previously observed for the bulk counterpart.",
journal = "Journal of Nanoparticle Research",
title = "Magnetic properties of nanoparticle La0.7Ca0.3MnO3 under applied hydrostatic pressure",
volume = "12",
number = "4",
pages = "1299-1306",
doi = "10.1007/s11051-010-9852-2"
}

Kusigerski, V., Marković, D., Spasojević, V., Tadić, M., Zentkova, M.,& Mihalik, M.. (2010). Magnetic properties of nanoparticle La0.7Ca0.3MnO3 under applied hydrostatic pressure. in Journal of Nanoparticle Research, 12(4), 1299-1306.
https://doi.org/10.1007/s11051-010-9852-2

Kusigerski V, Marković D, Spasojević V, Tadić M, Zentkova M, Mihalik M. Magnetic properties of nanoparticle La0.7Ca0.3MnO3 under applied hydrostatic pressure. in Journal of Nanoparticle Research. 2010;12(4):1299-1306.
doi:10.1007/s11051-010-9852-2 .

Kusigerski, Vladan, Marković, D., Spasojević, Vojislav, Tadić, Marin, Zentkova, M., Mihalik, M., "Magnetic properties of nanoparticle La0.7Ca0.3MnO3 under applied hydrostatic pressure" in Journal of Nanoparticle Research, 12, no. 4 (2010):1299-1306,
https://doi.org/10.1007/s11051-010-9852-2 . .