Micromagnetic computation for wall and Bloch line coercivity in thin films with perpendicular anisotropy

H. Asada, Kimihide Matsuyama, M. Gamachi, K. Taniguchi

研究成果: ジャーナルへの寄稿記事

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Wall and vertical Bloch line (VBL) coercivity arising from spatial nonuniformity in the material parameters has been investigated for a typical 5-μm bubble garnet film by means of a two-dimensional micromagnetic computation. Two-dimensional sinusoidal modulations in the magnitude of the uniaxial anisotropy were assumed as a model for a compositional nonuniformity. Nonuniformities with a spatial wavelength comparable to the wall width were found to exert the largest pinning effect. The typical computed value for the wall and VBL coercivity were 0.7 and 2.2 Oe, respectively, where 10% variation and wavelength of 0.47 μm were assumed. The tendency, that the VBL coercivity is larger than that for the domain wall, agrees with the experimental results reported previously. The wall and VBL coercivity caused by a nonuniform exchange constant have also been computed and compared to the analytical solutions due to the step-like variation of wall and VBL energies, respectively. The larger VBL coercivity compared to that for the wall was observed for a local modulation with the size less than wall width and period more than 1 μm.

元の言語英語
ページ(範囲)6089-6091
ページ数3
ジャーナルJournal of Applied Physics
75
発行部数10
DOI
出版物ステータス出版済み - 12 1 1994

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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