Numerical investigation of magnetic bubble types in a two-dimensional ferromagnetic system with dipole-dipole interactions
双極子相互作用を含む2次元強磁性体における磁気バブルタイプの数値的研究
横田 光史
Yokota, Terufumi
Landau-Lifshitz equation for a 2-dimensional anisotropic Heisenberg model with dipole-dipole interactions is solved numerically to investigate magnetic bubbles. Type I magnetic bubbles (magnetic skyrmions) with both left-handed and right-handed rotations appear. There is a minimal anisotropy necessary for the existence of magnetic bubbles. Magnetic skyrmions appear only in a limited region of the parameter space. The region is approximately the same as the one where mixed states with both in-plane ferromagnetic order and out-of- plane stripe pattern coexist at zero magnetic field. The size and the domain wall width of the magnetic skyrmions decrease as the anisotropy increases. The size depends also on the strength of the magnetic field. It decreases as the magnetic field increases. There may be a critical magnetic field above which the magnetic skyrmions do not exist and the size of the magnetic skyrmions is minimum at the critical field. The domain wall width of the magnetic skyrmions depends a little on the magnetic field.
- 登録番号 : AA20190147
- 抄録集掲載番号 : 47001521
- 論文投稿番号 : 22137
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