Abstract
Skyrmions are particle-like topological magnetic defects that form stable hexagonal close-packed lattices (SkX), where grain boundaries (GBs) in SkX critically influence their dynamics, yet the structural evolution of GBs during migration remains largely unexplored. We have observed sustained GB migration in-situ in a 2D skyrmion lattice bicrystal over relatively large migration distances, at different temperatures with single-particle resolution. Migration alternates between slow and fast stages, both of which cause substantial changes in the GB structure and misorientation. Stress accumulates during fast migration and is relieved during slow modes, yielding a stop-start process. These dynamics show similarity with GB migration theories in conventional crystal and suggest strategies to better control skyrmion lattice evolution.
| Original language | English |
|---|---|
| Article number | 117261 |
| Journal | Scripta Materialia |
| Volume | 278 |
| DOIs | |
| State | Published - Jun 1 2026 |
Funding
We acknowledge helpful discussions with Prof. Robert J MacQueeney from Iowa State University. This work was supported in part by Laboratory Directed Research and Development funds through Ames National Laboratory and the USA National Science Foundation (NSF) through Grant No. OMA-2328889 (LZ). All TEM-related work was performed using instruments in the Sensitive Instrument Facility in Ames National Laboratory. V.V.P. is grateful to the DOE for the assistantship and opportunity to participate in the SULI program. Work at ORNL was supported by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.
Keywords
- Collective motion
- Disconnection
- Grain boundary
- Grain boundary migration
- Skyrmion
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