4.8 Article

Dislocation-Driven Relaxation Processes at the Conical to Helical Phase Transition in FeGe

期刊

ACS NANO
卷 15, 期 11, 页码 17508-17514

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c04302

关键词

topological spin texture; edge dislocation; magnetic relaxation process; chiral magnet; FeGe

资金

  1. Swiss National Science Foundation [200021-149192, 200021-137520]
  2. JSPS KAKENHI [JP20H05155]
  3. JST CREST [JPMJCR1874]
  4. Research Council of Norway (FRINATEK project) [263228]
  5. NTNU
  6. Outstanding Academic Fellows Program
  7. [262633]
  8. Swiss National Science Foundation (SNF) [200021_149192] Funding Source: Swiss National Science Foundation (SNF)

向作者/读者索取更多资源

The study reveals that the motion of magnetic topological defects, such as edge dislocations, significantly impacts the formation of nanoscale spin structures in chiral magnets, disturbing the stability of helimagnetic spin structures.
The formation of topological spin textures at the nanoscale has a significant impact on the long-range order and dynamical response of magnetic materials. We study the relaxation mechanisms at the conical-to-helical phase transition in the chiral magnet FeGe. By combining macroscopic ac susceptibility measurement, surface-sensitive magnetic force microscopy, and micromagnetic simulations, we demonstrate how the motion of magnetic topological defects, here edge dislocations, impacts the local formation of a stable helimagnetic spin structure. Although the simulations show that the edge dislocations can move with a velocity up to 100 m/s through the helimagnetic background, their dynamics are observed to disturb the magnetic order on the time scale of minutes due to randomly distributed pinning sites. The results corroborate the substantial impact of dislocation motions on the nanoscale spin structure in chiral magnets, revealing previously hidden effects on the formation of helimagnetic domains and domain walls.

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