Dynamical mass generation for ferromagnetic skyrmions in two dimensions

TL;DR

This paper demonstrates that magnetic skyrmions in two dimensions acquire a dynamical mass due to their coupling with magnons, providing new insights into their inertia and potential for engineered dynamics.

Contribution

It introduces a novel concept of skyrmion mass arising from magnon coupling, advancing understanding of skyrmion dynamics in magnetic materials.

Findings

Identification of a dynamical mass for skyrmions due to magnon coupling

Potential to engineer skyrmion motion via magnon interactions

Enhanced understanding of skyrmion inertia in 2D systems

Abstract

Magnetic skyrmions are topological magnetization textures that are characterized by the homotopy group of two dimensional spheres. Despite years of intensive research on skyrmions, the fundamental problem of the inertia of a skyrmion in driven motion remains unresolved. By properly taking into account a direct coupling between skyrmion motion and the correspondingly excited magnons, we identify a dynamical mass for the skyrmion in motion. The direct coupling between skyrmion motion and magnons can be employed to engineer skyrmion dynamics with magnons through ingenious material and geometry design.