Desplat, L., Vogler, C., Kim, J.-V., Stamps, R. L. and Suess, D. (2020) Path sampling for lifetimes of metastable magnetic skyrmions and direct comparison with Kramers' method. Physical Review B, 101(6), 060403(R). (doi: 10.1103/PhysRevB.101.060403)
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209969.pdf - Accepted Version 4MB |
Abstract
We perform a direct comparison between Kramers' method in many dimensions, i.e., Langer's theory, adapted to magnetic spin systems, and a path sampling method in the form of forward flux sampling, as a means to compute the collapse rates of metastable magnetic skyrmions. We show that a good agreement is obtained between the two methods. We report variations of the attempt frequency associated with skyrmion collapse by three to four orders of magnitude when varying the applied magnetic field by 5 % of the exchange strength, which confirms the existence of a strong entropic contribution to the lifetime of skyrmions. This demonstrates that in complex systems, the knowledge of the rate prefactor, in addition to the internal energy barrier, is essential in order to properly estimate a lifetime.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Stamps, Professor Robert and Desplat, Louise |
| Authors: | Desplat, L., Vogler, C., Kim, J.-V., Stamps, R. L., and Suess, D. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physical Review B |
| Publisher: | American Physical Society |
| ISSN: | 2469-9950 |
| ISSN (Online): | 2469-9969 |
| Published Online: | 10 February 2020 |
| Copyright Holders: | Copyright © 2020 American Physical Society |
| First Published: | First published in Physical Review B 101(6): 060403(R) |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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