Various topological spin textures in a two-dimensional Heisenberg ferromagnet with dipole-dipole interactions

双極子相互作用を含む2次元ハイゼンベルグ強磁性体における様々なトポロジカルスピン構造

横田 光史   

Yokota, Terufumi

Magnetic skyrmions are known to exist in ferromagnetic films with dipole-dipole interactions. A two-dimensional Heisenberg ferromagnet with magnetic anisotropy and dipole-dipole interactions is investigated numerically. There exist various topological spin textures. Antiskyrmions coalesce to form spin textures with and , where is the topological number. Skyrmion molecules and antiskyrmion molecules as well as donut-shaped spin textures with appear. The appearance of these (meta)stable topological spin textures depends on the values of temperature and (or) external magnetic field.