Abstract
We report the exchange bias in antiferromagnet/ferrimagnet Cr₂O₃/Fe₃O₄ core/shell nanoparticles. The magnetic field hysteresis curve for Cr₂O₃/Fe₃O₄ nanoparticles after field-cooling (FC) clearly showed both horizontal (H EB ~610 Oe) and vertical (ΔM~5.6 emu/g) shifts at 5 K. These shifts disappeared as the temperature increased toward the Neel temperature of Cr₂O₃ (T N ~307 K). The H EB and ΔM values were sharply decreased between the 1 s t and the 2 nd magnetic field cycles, and then slowly decreased with further cycling. These results are discussed in terms of the formation of single domains with pinned, uncompensated, antiferromagnetic spin and their evolution into multi-domains with cycling.
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