Abstract

Magnetic properties and exchange bias effect of the polycrystalline and nanocrystalline La0.375Ca0.625MnO3 compounds have been presented. With reduction of the particle size, uncompensated surface spin induced ferromagnetism is pronounced in nanocrystalline sample. However, at higher magnetic field value, long range charge ordering (associated with antiferromagnetic nature) is predominant even in nanoparticles similar as bulk counterpart. Exchange bias properties of both compounds have been found at low temperature with increasing nature depending on the cooling magnetic field. Significantly large value of the exchange bias effect in this particular bulk compound and modification of it in nanocrystalline sample is addressed considering the disordered polymorphs developed within the charge-orbital ordered phase.

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