Exchange Bias of the Fe/Fe3O4 Coated Ag/Hollow Glass Microspheres

This paper presents an investigation of the exchange bias of the Fe/Fe3O4 layer deposited on the Ag/hollow glass microspheres. The results show that exchange bias is affected by different thickness of Fe3O4 layer which is caused by different reaction time. The exchange bias field (H-E) increases gradually with increasing reaction time, and achieves maximum value when the reaction time reaches 30min; after that, it decreases. It is also found that the changes of exchange bias field (HE) are proposed to the frozen interfacial spins and the structural lattice disorder