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Phys Rev Lett. 2011 Sep 23;107(13):136804. Epub 2011 Sep 23.

Dynamics of Skyrmion crystals in metallic thin films.

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1
Department of Physics, Fudan University, Shanghai, China. jdzang@fudan.edu.cn

Abstract

We study the collective dynamics of the Skyrmion crystal in thin films of ferromagnetic metals resulting from the nontrivial Skyrmion topology. It is shown that the current-driven motion of the crystal reduces the topological Hall effect and the Skyrmion trajectories bend away from the direction of the electric current (the Skyrmion Hall effect). We find a new dissipation mechanism in noncollinear spin textures that can lead to a much faster spin relaxation than Gilbert damping, calculate the dispersion of phonons in the Skyrmion crystal, and discuss the effects of impurity pinning of Skyrmions.

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