Dynamics of Skyrmion Contraction and Expansion in a Magnetic Film

Abstract

Contraction and expansion of skyrmions in ferromagnetic films are investigated. In centrosymmetric systems, the dynamics of a collapsing skyrmion is driven by dissipation. The collapse time has a minimum on the damping constant. In systems with broken inversion symmetry, the evolution of skyrmions toward equilibrium size is driven by the Dzyaloshinskii-Moriya interaction. Expressions describing the time dependence of the skyrmion size are derived and their implications for skyrmion-based information processing are discussed.

arXiv commentSix pages, two figures, to appear in the journal of Low Temperature Physics published by the B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine