Theory of Magnetic Anisotropy Due to an Anisotropic Impurity Spin
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概要
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Magnetic anisotropy due to an anisotropic impurity spin in an otherwise pure isotropic ferromagnet is studied theoretically. A new formalism is developed, which takes into account effects of local nonuniformity of the host spin directions around the impurity. A reduced expression of free energy is derived, where the effects are represented by a few parameters, namely, the exchange integral between host spins, the applied field and the deflection angle of the nearest neighbor spins of the impurity from the applied field, eliminating all the other host spin variables. By use of the developed formalism, static behaviors, such as torque curves and the spatial variation of spin directions, are investigated. An asymptotic form of the deflection angle at a large distance is of a well known Ornstein-Zernike type. The maximum possible torque is determined by the host-impurity exchange coupling for a large crystalline anisotropy of the impurity.
- 社団法人日本物理学会の論文
- 1972-10-05
著者
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ASADA Toshio
Department of Polymer Chemistry, Waseda University
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Asada Toshio
Department Of General Education College Of Engineering Shizuoka University
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Asada Toshio
Department Of Physics Faculty Of Science Osaka University:(present Address) Department Of Physics Co
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MIWA Hirosi
Department of Physics, Faculty of Science, Osaka University
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Miwa Hirosi
Department Of Physics Faculty Of Science Osaka University
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Miwa Hirosi
Department of Agricultural Chemistry, Faculty of Agriculture, Tokyo University of Agriculture
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