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  • Title: Giant Skyrmions stabilized by dipole-dipole interactions in thin ferromagnetic films.
    Author: Ezawa M.
    Journal: Phys Rev Lett; 2010 Nov 05; 105(19):197202. PubMed ID: 21231193.
    Abstract:
    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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