A micromagnetic theory of skyrmion lifetime in ultrathin ferromagnetic films

Authors

Anne Bernand-Mantel, INSA Toulouse
Cyrill B. Muratov, New Jersey Institute of Technology
Valeriy V. Slastikov, University of Bristol

Document Type

Article

Publication Date

7-19-2022

Abstract

We use the continuum micromagnetic framework to derive the formulas for compact skyrmion lifetime due to thermal noise in ultrathin ferromagnetic films with relatively weak interfacial Dzyaloshinskii-Moriya interaction. In the absence of a saddle point connecting the skyrmion solution to the ferromagnetic state, we interpret the skyrmion collapse event as “capture by an absorber” at microscale. This yields an explicit Arrhenius collapse rate with both the barrier height and the prefactor as functions of all the material parameters, as well as the dynamical paths to collapse.

Identifier

85133875094 (Scopus)

Publication Title

Proceedings of the National Academy of Sciences of the United States of America

External Full Text Location

https://doi.org/10.1073/pnas.2122237119

e-ISSN

10916490

ISSN

00278424

PubMed ID

35858324

Issue

29

Volume

119

Grant

DMS-1908709

Fund Ref

National Science Foundation

Recommended Citation

Bernand-Mantel, Anne; Muratov, Cyrill B.; and Slastikov, Valeriy V., "A micromagnetic theory of skyrmion lifetime in ultrathin ferromagnetic films" (2022). Faculty Publications. 2793.
https://digitalcommons.njit.edu/fac_pubs/2793