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Exchange Bias in Cr2O3/Fe3O4 Core/Shell Nanoparticles
Journal of Magnetics, Volume 14, Number 4, 31 Dec 2009, Pages 147-149
B. K. Yun (Department of Physics, Inha University), Y. S. Koo (Department of Physics, Inha University), J. H. Jung * (Department of Physics, Inha University)
Abstract
We report the exchange bias in antiferromagnet/ferrimagnet Cr2O3/Fe3O4 core/shell nanoparticles. The magnetic field hysteresis curve for Cr2O3/Fe3O4nanoparticles after field-cooling (FC) clearly showed both horizontal (HEB~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 (TN~307 K). The HEB and ΔM values were sharply decreased between the 1st and the 2nd 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.
Keywords: exchange bias; Cr2O3/Fe3O4; core/shell nanoparticles; pinned uncompensated antiferromagnetic domain
DOI: 10.4283/JMAG.2009.14.4.147
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