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声学驱动的磁性 skyrmion 运动
1School of Integrated Circuits and Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing, China.
Nature communications
|February 3, 2024
概括
表面声波 (SAW) 可以有效地移动磁性天体. 这项研究表明,剪切水平SAW驱动斯基米安运动,为低功率的自旋电子设备提供了一条新的道路.
科学领域:
- 这就是Spintronics.
- 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
背景情况:
- 磁性 skyrmions 对于新型的自旋电子设备来说是有希望的.
- 电流驱动的旋转轨道扭矩是电气操纵的主要方法.
- 表面声波 (SAWs) 提供了一个潜在的替代方案,通过磁弹性效应来操纵skyrmion.
研究的目的:
- 用表面声波 (SAWs) 实验证明Neel型磁性 skyrmions的方向运动.
- 为了研究不同SAW类型对 skyrmion动态的影响.
- 为了探索声波驱动的 skyrmion 操纵用于超低功率自旋电子.
主要方法:
- 制造芯片上的压电传感器,以产生传播SAW脉冲.
- 在Ta/CoFeB/MgO/Ta多层中实验观察Néel类型的 skyrmion运动.
- 微磁模拟以证实观察到的斯基米翁动力学.
主要成果:
- 发现剪切水平 SAW 能够有效地驱动 skyrmions 的方向运动.
- 具有纵向和剪切垂直移位 (雷利波) 的SAWs没有诱导 skyrmion 运动.
- 沿着SAW传播方向的纵向运动和由于拓电荷的横向运动都被观察到.
结论:
- 声波,特别是剪切水平SAWs,提供了一个有效的方法来操纵磁性 skyrmions.
- 这种声学操纵方法为开发超低功率电磁波器件提供了一个有前途的途径.
- 这些发现为在自旋电子应用中利用弹性波开辟了新的途径.
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