Thermodynamic behavior of a nano-sized magnetic grain near the superparamagnetic limit (第7回アジア情報記録技術シンポジウム〔英文〕)
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概要
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A combined theory of the micromagnetic and Monte Carlo simulations is established to analyze the thermal property of a nano-sized magnetic grain. The Langevin equation of a grains's magnetic moment is the Landau-Lifshitz equation augmented by a "random-field" term representing the thermal-agitated force. The angular distribution of the magnetic moment of the grain is studied via its time evolution process. The tunnelling of the magnetic moment vector between two energy-minimum states is observed. A simple analytical expression is obtained for the simulated attempt frequency, which agrees well with the experiential value.
- 一般社団法人映像情報メディア学会の論文
- 2002-11-07
著者
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Wei Dan
Lab of Advanced Materials, Dept. of Materials Science and Engineering, Tsinghua University
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Wei Dan
Lab Of Advanced Materials Dept. Of Materials Science And Engineering Tsinghua University
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Wei Dan
Lab Of Advanced Materials Department Of Materials Science And Engineering Tsinghua University
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Qin Jian
Lab Of Advanced Materials Dept. Of Materials Science And Engineering Tsinghua University
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