磁気超薄膜のマイクロマグネティック理論

概要

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The phenomenon of spin reorientation in ultrathin magnetic films is discussed. A micromagnetic theory is presented that reveals the competition between the in-plane shape anisotropy and the perpendicular surface anisotropy through a finite exchange stiffness. For small surface anisotropy, two continuous transitions in spin orientation are derived theoretically as the film thickness is increased: first from the uniform, normal configuration to a non-uniform, canting configuration, and then to the uniform, in-plane configuration. This result is consistent with experimental observations. For large surface anisotropy, it is shown theoretically that only the first spin reorientation occurs and that the non-uniform, canting configuration remains stable even for a large thickness limit. From the good agreement between the scaled results of the discrete model and the results of the continuum model, it is concluded that the continuum approach is applicable to magnetic films as thin as several atomic layers. The scaling relation is expected to provide a unified way for plotting experimental results on spin reorientation transitions in various magnetic films.
社団法人日本磁気学会の論文
1997-12-01