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

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Dislocation-Driven Relaxation Processes at the Conical to Helical Phase Transition in FeGe
ACS Nano ( IF 15.8 ) Pub Date : 2021-10-19 , DOI: 10.1021/acsnano.1c04302
Peggy Schoenherr _{1,

2,

3} , Mariia Stepanova ₄ , Erik Nikolai Lysne ₄ , Naoya Kanazawa ₅ , Yoshinori Tokura _{5,

6} , Anders Bergman ₇ , Dennis Meier _{4,

8}

Affiliation

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.

中文翻译：

FeGe 锥形到螺旋相变时位错驱动的弛豫过程

纳米尺度拓扑自旋纹理的形成对磁性材料的长程有序和动力学响应具有显着影响。我们研究了手性磁铁 FeGe 中锥形到螺旋相变的弛豫机制。通过结合宏观交流磁化率测量、表面敏感磁力显微镜和微磁模拟，我们展示了磁性拓扑缺陷（这里是边缘位错）的运动如何影响稳定的螺旋磁自旋结构的局部形成。尽管模拟表明边缘位错可以以高达 100 m/s 的速度通过螺旋磁背景移动，但由于随机分布的钉扎位点，观察到它们的动力学会在几分钟的时间尺度上扰乱磁序。

更新日期：2021-11-23

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