A micromagnetic theory of skyrmion lifetime in ultrathin ferromagnetic films
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 11, 2022
- Source ID
- 10.1073/pnas.2122237119
Entities
People
- Anne Bernand-Mantel
- Cyrill B Muratov
- Valeriy V. Slastikov
Organizations
- Leverhulme Trust
- National Science Foundation
- New Jersey Institute of Technology
- University of Bristol
- University of Pisa
- University of Toulouse (1896-1968)