Convergent tangent plane integrators for the simulation of chiral magnetic skyrmion dynamics

TL;DR

This paper introduces and analyzes three convergent tangent plane integrators for simulating chiral magnetic skyrmion dynamics, incorporating Dzyaloshinskii-Moriya interactions in the Landau-Lifshitz-Gilbert equation.

Contribution

The paper proposes and rigorously proves the convergence of three new tangent plane integrators for the Landau-Lifshitz-Gilbert equation with Dzyaloshinskii-Moriya interaction.

Findings

Proved unconditional convergence of the integrators.

Established existence of weak solutions.

Numerical experiments confirm practical applicability.

Abstract

We consider the numerical approximation of the Landau-Lifshitz-Gilbert equation, which describes the dynamics of the magnetization in ferromagnetic materials. In addition to the classical micromagnetic contributions, the energy comprises the Dzyaloshinskii-Moriya interaction, which is the most important ingredient for the enucleation and the stabilization of chiral magnetic skyrmions. We propose and analyze three tangent plane integrators, for which we prove (unconditional) convergence of the finite element solutions towards a weak solution of the problem. The analysis is constructive and also establishes existence of weak solutions. Numerical experiments demonstrate the applicability of the methods for the simulation of practically relevant problem sizes.