Affordable Access

deepdyve-link
Publisher Website

Dynamics and energetics of emergent magnetic monopoles in chiral magnets

Authors
Type
Published Article
Publication Date
Submission Date
Identifiers
DOI: 10.1103/PhysRevB.90.174432
Source
arXiv
License
Yellow
External links

Abstract

The formation and destruction of topologically quantized magnetic whirls, so-called skyrmions, in chiral magnets is driven by the creation and motion of singular hedgehog defects. These can be identified with emergent magnetic monopoles and antimonopoles. We investigate how the energetics of and forces between monopoles and antimonopoles influence their creation rate and dynamics. We study a single skyrmion line defect in the helical phase using both micromagnetic simulations and a Ginzburg-Landau analysis. Monopole-antimonople pairs are created in a thermally activated process, largely controlled by the (core) energy of the monopole. The force between monopoles and antimonopoles is linear in distance and described by a string tension. The sign and size of the string tension determines the stability of the phases and the velocity of the monopoles.

Statistics

Seen <100 times