A FREEZING FERROMAGNETIC MOMENT MODEL FOR EXCHANGE BIAS INα-Fe2O3NANOLEAVES

Ying-Ying Xu, Zhao Dong, Xiong-Jian Zhang, Wen-Tao Jin, Pavel Kashkarov and Han Zhang ()
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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

International Journal of Modern Physics C (IJMPC), 2009, vol. 20, issue 05, 761-768

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.

Keywords: Freezing moment; model; exchange bias; α-Fe2O3nanoleaf; 75.10.Hk; 75.30.Et; 75.75.+a (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0129183109013984

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