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In transition metal oxides, quantum confinement arising from a large surfaceto volume ratio often gives rise to novel physico-chemical properties atnanoscale. Their size dependent properties have potential applications indiverse areas, including therapeutics, imaging, electronic devices,communication systems, sensors, and catalysis. We have analyzed structural,magnetic, dielectric, and thermal properties of weakly ferromagnetic SmFeO3nanoparticles of sizes about 55 nm and 500 nm. The nano-size particles exhibitseveral distinct features that are neither observed in their larger-sizevariants nor reported previously for the single crystals. In particular, forthe 55 nm particle, we observe six-fold enhancement of compensationtemperature, an unusual rise in susceptibility in the temperature range 550 to630 K due to spin pinning, and coupled antiferromagnetic-ferroelectrictransition, directly observed in the dielectric constant.

Nanosize effect: Enhanced compensation temperature and existence of magneto-dielectric coupling in SmFeO3