Exchange bias effect in polycrystalline Bi0.5Sr0.5Fe0.5Cr0.5O3 bulk

Bulk Bi0.5Sr0.5Fe0.5Cr0.5O3 (BSFCO) is a new compound comprising the R3c structure. The structural, magnetic property and exchange bias (EB) details are investigated. The material was in the super-paramagnetic (SP) state at room temperature. Exchange bias usually occurs at the boundary between different magnetic states after field cooling (H-FC) acts on the sample. Here the result shows that changing H-FC from 1 to 6 T reduces the H-EB value by 16% at 2 K at the same time. Meanwhile, H-EB diminishes as the ferromagnetic layer thickness increases. The variation of (the thickness of ferromagnetic layer) t(FM) with the change of H-FC leads to the tuning of H-EB by H-FC in BSFCO bulk. These effects are obviously different from the phenomenon seen in other oxide types.