Thermal creep and the skyrmion Hall angle in driven skyrmion crystals
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
In this study, we numerically examine thermal effects on the skyrmion Hall angle for driven skyrmions interacting with quenched disorder. We identify a creep regime in which motion occurs via intermittent jumps between pinned and flowing states. Here the skyrmion Hall angle is zero since the skyrmions have time to relax into equilibrium positions in the pinning sites, eliminating the side-jump motion induced by the Magnus force. At higher drives we find a crossover to a viscous flow regime where the skyrmion Hall angle is finite and increases with increasing drive or temperature. Finally, our results are in agreement with recent experiments which also show a regime of finite skyrmion velocity with zero skyrmion Hall angle crossing over to a viscous flow regime with a skyrmion Hall angle that increases with drive.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- 89233218CNA000001; AC52-06NA25396
- OSTI ID:
- 1768528
- Alternate ID(s):
- OSTI ID: 1484650
- Report Number(s):
- LA-UR-18-30672; LA-UR-18-24474; TRN: US2206612
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 31, Issue 7; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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