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A FREEZING FERROMAGNETIC MOMENT MODEL FOR EXCHANGE BIAS INα-Fe2O3NANOLEAVES

Author

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  • YING-YING XU

    (Materials Physics Laboratory, State Key Laboratory for Mesoscope Physics, Department of Physics, Peking University, Beijing 100871, China)

  • ZHAO DONG

    (Materials Physics Laboratory, State Key Laboratory for Mesoscope Physics, Department of Physics, Peking University, Beijing 100871, China)

  • XIONG-JIAN ZHANG

    (Materials Physics Laboratory, State Key Laboratory for Mesoscope Physics, Department of Physics, Peking University, Beijing 100871, China)

  • WEN-TAO JIN

    (Materials Physics Laboratory, State Key Laboratory for Mesoscope Physics, Department of Physics, Peking University, Beijing 100871, China)

  • PAVEL KASHKAROV

    (Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow 119899, Russian Federation)

  • HAN ZHANG

    (Materials Physics Laboratory, State Key Laboratory for Mesoscope Physics, Department of Physics, Peking University, Beijing 100871, China)

Abstract

We propose a freezing ferromagnetic moment model to explain the exchange bias discovered inα-Fe2O3antiferromagnetic nanoleaves most recently. The model assumes that in the antiferromagnetic nanosystem, the disorder surface spins are frozen at low temperature along magnetic filed direction, forming a ferromagnetic layer. Then this frozen ferromagnetic surface state couples with the inside antiferromagnetic layers that results in an exchange bias. After some proper simplification, we get the magnetization at different applied field by the minimal energy calculation using MATLAB. Our model computerizing indicates the exchange bias shift of the magnetization curve is-48.2Oeforn = 100antiferromagnetic layers, which matches the observed value very well.

Suggested Citation

  • Ying-Ying Xu & Zhao Dong & Xiong-Jian Zhang & Wen-Tao Jin & Pavel Kashkarov & Han Zhang, 2009. "A FREEZING FERROMAGNETIC MOMENT MODEL FOR EXCHANGE BIAS INα-Fe2O3NANOLEAVES," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 20(05), pages 761-768.
    • Handle: RePEc:wsi:ijmpcx:v:20:y:2009:i:05:n:s0129183109013984
    DOI: 10.1142/S0129183109013984
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