Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Exchange Bias in Cr2O3/Fe3O4 Core/Shell Nanoparticles

  • Yun, B.K. (Department of Physics, Inha University) ;
  • Koo, Y.S. (Department of Physics, Inha University) ;
  • Jung, J.H. (Department of Physics, Inha University)
  • Published : 2009.12.31
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Abstract

We report the exchange bias in antiferromagnet/ferrimagnet $Cr_2O_3/Fe_3O_4$ core/shell nanoparticles. The magnetic field hysteresis curve for $Cr_2O_3/Fe_3O_4$ nanoparticles after field-cooling (FC) clearly showed both horizontal ($H_{EB}{\sim}$610 Oe) and vertical (${\Delta}M{\sim}$5.6 emu/g) shifts at 5 K. These shifts disappeared as the temperature increased toward the Neel temperature of $Cr_2O_3\;(T_N{\sim}$307 K). The $H_{EB}\;and\;{\Delta}M$ values were sharply decreased between the $1^{st}\;and\;the\;2^{nd}$ 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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