Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 31, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/aaefd7
Keywords
skyrmions; thermal creep; Magnus force
Categories
Funding
- US Department of Energy through the LANL/LDRD program
- NNSA of the US DoE at LANL [DE-AC52-06NA25396]
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We numerically examine thermal effects on the skyrmion Ilan 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 equilibritum 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. 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 Mall angle that increases with drive.
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