Abstract
The cluster-glass compound LaMn0.7Fe0.3O3 was synthesized with average particle sizes∼20,∼90,and ∼300 nm. We observed a shift of the magnetic hysteresis loop in the field axis while the samplewas cooled in an external magnetic field. The systematic shift of the hysteresis loops andthe cooling field dependence of the shift indicated the phenomenon of exchange bias.The exchange bias field was found to be strongly dependent on the particle size,where the exchange bias field decreased considerably with an increase of particlesize, and the weak effect of exchange bias was observed for particles with size∼300 nm. A cluster-glass state with short range ferromagnetic clusters embedded in thespin-glass like host has been proposed, where the average size of the ferromagnetic clusterincreases with particle size.
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