在室温旋转为电荷转换的无形拓绝缘Gd合金BiSe1-/CoFeB支架
Protyush Sahu1, Yifei Yang2, Yihong Fan2
1School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, Minnesota 55455, United States.
ACS applied materials & interfaces
|August 8, 2023
概括
无序的拓绝缘膜显示在喷的Gd合金双层BiSe/CoFeB中旋电荷转换 (SCC). 这一发现为无形固体中的拓系统开辟了新的途径.
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
- 这就是Spintronics.
背景情况:
- 无序的拓绝缘膜 (TI) 结合了异国情调的运输特性和基于喷雾的批量生产优势.
- 无形合金为新的电子和自旋电子应用提供了潜力.
研究的目的:
- 在无形的Gd合金BiSe (BSG) /CoFeB双层中研究旋电荷转换 (SCC).
- 探索无形TI表面状态和SCC之间的关系.
- 为在喷射无形TI系统中提供SCC的实验证据.
主要方法:
- 使用喷制造BSG/CoFeB双层的制造.
- 旋转抽和逆埃德尔斯坦效应 (IEE) 的测量.
- 太赫兹 (THz) 时间域光谱学.
- 角度分辨率光辐射光谱学 (ARPES).
主要成果:
- 在无形BSG/CoFeB双层中观察到SCC的明显证据.
- 测定了0.035nm (IEE长度 λIEE) 的最大SCC效率 (SCE),用于6nm的BSG厚度,由于表面粗而随着厚度的增加而衰变.
- THz光谱证实了与界面状态相关的SCC与BSG厚度的最小依赖.
- 据ARPES数据显示,分散的2D表面状态跨越了散体间隙,支持从无形TI状态到SCC.
结论:
- 无形拓绝缘体的表面状态促进了高效的自旋电荷转换.
- 喷射无形TI/铁磁二层对自旋电子设备来说是有前途的.
- 这项工作建立了一种新的实验方法,用于探索无形材料中的拓现象.
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