Giant Skyrmions Stabilized by Dipole-Dipole Interactions in Thin Ferromagnetic Films

Details Giant Skyrmions Stabilized by Dipole-Dipole Interactions in Thin Ferromagnetic Films Giant Skyrmions Stabilized by Dipole-Dipole Interactions in Thin Ferromagnetic Films

2010-07-23

arxiv.org/abs/1007.4048v2

Phys.Rev.Lett.105:197202,2010

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.105.197202

Motivated by a recent magnetization reversal experiment on a TbFeCo thin film, we study a topological excitation in the anisotropic nonlinear sigma model together with the Zeeman and magnetic dipole-dipole interactions. Dipole-dipole interactions turn a ferromagnet into a frustrated spin system, which allows a nontrivial spin texture such as a giant skyrmion. We derive an analytic formula for the skyrmion radius. The radius is controllable by the external magnetic field. It is intriguing that a skyrmion may have already been observed as a magnetic domain. A salient feature is that a single skyrmion can be created or destroyed experimentally. An analysis is made also on skyrmions in chiral magnets.

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