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Spin Glass Dynamics of Nanoparticle La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3 Obtained by a Mechanochemical Milling

100%

Perovic M., Mrakovic A., Kusigerski V., Blanusa J., Spasojevic V.

issue 5

813-814

Spin dynamics of nanoparticle La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3 system was studied through the set of diverse magnetic measurements. Analysis of the data obtained from magnetic relaxation measurements, memory effect and AC susceptibility experiments pointed to a spin glass like behavior of interacting nanoparticle system.

Magnetism of Nanoparticle La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3 under Applied Hydrostatic Pressure

86%

Kusigerski V., Perovic M., Mrakovic A., Blanusa J., Mihalik M., Zentkova M., Spasojevic V.

issue 5

811-812

Nanoparticle La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3 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} ≈ 34 K, and ferro-to-paramagnet transition at T_{C} ≈ 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_{C} 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.

Exchange Bias Effect in NdFeO₃ System of Nanoparticles

73%

Vavra M., Zentková M., Mihalik M., Mihalik Jr. M., Lazúrová J., Girman V., Perovic M., Kusigerski V., Roupcova P., Jaglicic Z.

Acta Physica Polonica A

2017

vol. 131

issue 4

869-871

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°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 Pnma with lattice parameters a =5.5817 Å, b=7.7663 Å and c =5.456 Å for as prepared sample. The presence of superparamagnetic particles was indicated by the Mössbauer 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-shell model.

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3 Acta Physica Polonica A

1 2017

2 2010

3 Kusigerski V.

3 Perovic M.

2 Blanusa J.

2 Mihalik M.

2 Mrakovic A.

2 Spasojevic V.

1 Girman V.

1 Jaglicic Z.

1 Lazúrová J.

1 Mihalik Jr. M.

1 Roupcova P.

1 Vavra M.

1 Zentkova M.

1 Zentková M.

Search results

Spin Glass Dynamics of Nanoparticle La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3 Obtained by a Mechanochemical Milling

Magnetism of Nanoparticle La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3 under Applied Hydrostatic Pressure

Exchange Bias Effect in NdFeO₃ System of Nanoparticles