単磁区粒子の保磁力値に与える表面磁気異方性の効果 : 計算機シミュレーションによる考察

概要

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Effects of surface anisotropy on magnetic property of ferromagnetic small particles have been considered in this article. Particularly to evaluate the effect of surface anisotropy on magnetic coercivity of a particle, a computer simulation has been made for a calculation of technical magnetization curves of magnetic single-domain particles by assuming surface anisotropy acting additionally to existing uniaxial magneto-crystalline anisotropy in a particle body (bulk). Micromagnetic calculations, based on Landau-Lifshitz-Gilbert equation, indicate an enhanced coercivity for a single-domain particle with the smaller particle size and also with the stronger surface anisotropy acting there, in accord with the existing coercivity data for various materials in small particle forms.
石巻専修大学の論文