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Exchange Bias Effect in NdFeO₃ System of Nanoparticles

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

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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1 Acta Physica Polonica A

1 2017

1 Girman V.

1 Jaglicic Z.

1 Kusigerski V.

1 Lazúrová J.

1 Mihalik Jr. M.

1 Mihalik M.

1 Perovic M.

1 Roupcova P.

1 Vavra M.

1 Zentková M.

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Exchange Bias Effect in NdFeO₃ System of Nanoparticles