在范德瓦尔斯铁磁Cr2Ge2Te6中电气检测自旋,具有较低的磁性阻尼
Hongjun Xu1,2, Ke Jia1,3, Yuan Huang4
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, China.
Nature communications
|June 28, 2023
概括
磁性二维材料使得自旋电子成为可能. 这项研究证明了使用自旋将Cr2Ge2Te6转化为Pt或W的高效自旋电流生成,从而实现了创纪录的低磁性减.
科学领域:
- 这就是Spintronics.
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 在二维范德瓦尔斯材料中整合磁性秩序为旋转电子设备提供了新的途径.
- 在这些系统中,通过自旋的连贯自旋注入仍然是一个未被充分探索但至关重要的应用.
研究的目的:
- 为了证明和量化从磁性2D范德瓦尔斯材料 (Cr2Ge2Te6) 到相邻的重金属 (Pt,W) 的自旋.
- 为了研究2D材料/金属接口中旋转电流生成和传输的效率.
主要方法:
- 利用自旋实验,从Cr2Ge2Te6.6产生自旋电流.
- 在 Pt 或 W 中使用反旋转霍尔效应来检测产生的旋转电流.
- 测量了Cr2Ge2Te6/Pt混合系统的磁化动态,以提取材料参数.
主要成果:
- 成功实现了从Cr2Ge2Te6向Pt和W的自旋送,通过反自旋霍尔效应检测了自旋电流.
- 对于厚厚的Cr2Ge2Te6片,确定了创纪录的低磁阻尼常数 (~4-10 × 10^-4),表明其具有高质量的磁性.
- 量化了高接口旋转传输效率,其旋转混合电导率为2.4 × 10^19/m^2,对于高效的旋转传输至关重要.
结论:
- 在Cr2Ge2Te6中低磁性缓和高界面旋转传输效率的结合使其成为旋转电子应用的有希望的材料.
- Cr2Ge2Te6可以在低温二维自旋电子设备中作为连贯自旋或马格农电流的有效来源.
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