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在范德瓦尔斯磁铁中,应变梯度诱导了纹的斯基尔米翁
Shuaizhao Jin1, Yujia Liu1, Zunyi Deng1
1School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Advanced materials (Deerfield Beach, Fla.)
|May 9, 2025
概括
应变梯度,而不是均应变,是操纵Fe3GaTe2.2中的磁域的关键. 机械纹会产生应变梯度,从而将迷宫域转化为斯基尔米翁,为无现场的斯基尔米翁生成提供了一个新的途径.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 机械变形,特别是应变,是控制磁域结构的一个已知的方法.
- 实验应用的菌株往往不均,因此很难分离统一菌株对抗菌株梯度的影响.
- 了解均应变和应变梯度的不同作用对于推进磁性的机械操纵至关重要.
研究的目的:
- 研究应变梯度在磁域操纵中的关键作用.
- 为了区分万德瓦尔斯铁磁体中均应变的影响与应变梯度.
- 探索一种使用机械刺激产生磁性 skyrmions 的新机制.
主要方法:
- 对应变调和应变梯度效应的直接比较.
- 利用机械纹来诱导受控的平面内应变梯度.
- 对磁域演变的实验观测.
- 使用密度函数理论和微磁建模的理论模拟.
主要成果:
- 由机械纹引起的应变梯度被发现对Fe3GaTe2.2中的磁域操纵至关重要.
- 一个地面状态的迷宫式磁域结构在平面内应变梯度下转化为一个 skyrmion 状态.
- 在纹峰的两侧观察到不对称的磁域演变.
- 理论模拟证实,垂直磁性不均性和Dzyaloshinskii-Moriya相互作用的合驱动了这种不对称的进化.
结论:
- 应变梯度在操纵磁性质方面发挥着至关重要的作用,与均应变效应不同.
- 机械纹提供了一种有效的方法来产生应变梯度来控制磁域结构.
- 这项研究提出了一种新的机制,用于产生无磁场的磁性 skyrmions,通过应变梯度工程实现.
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