Dynamics of Skyrmion Contraction and Expansion in a Magnetic Film

TL;DR

This paper investigates the dynamics of skyrmion contraction and expansion in magnetic films, highlighting how dissipation and Dzyaloshinskii-Moriya interactions influence skyrmion behavior and potential information processing applications.

Contribution

It provides new analytical expressions describing skyrmion size evolution in different symmetry systems, advancing understanding of skyrmion dynamics in magnetic materials.

Findings

Collapse time depends on damping constant with a minimum value.

Dzyaloshinskii-Moriya interaction drives skyrmions toward equilibrium size.

Derived expressions for skyrmion size evolution applicable to information processing.

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.