在Pt \\CoCr2 O4异构结构中,Spin Hall磁阻和旋转西贝克效应
Aisha Aqeel1,2,3,4, Matthias Kronseder3, Nynke Vlietstra1
1School of Natural Sciences, Technical University of Munich, Garching, Germany.
Science and technology of advanced materials
|February 14, 2025
概括
在低温下研究Pt/CCO膜中的自旋哈尔磁阻和自旋西贝克效应等自旋电流现象,发现了明显的磁相相关性. 观察到的信号主要来自SMR和SSE,而不是磁性近距离效应.
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:
- 旋转电流驱动的现象对于下一代电子产品至关重要.
- 了解磁性材料的接口上的自旋传输是必不可少的.
- 像CoCr2O4 (CCO) 这样的非线性磁铁具有独特的磁性.
研究的目的:
- 在Pt/CCO异构结构中研究自旋哈尔磁电阻 (SMR) 和自旋西贝克效应 (SSE).
- 分析SMR和SSE信号的温度和角度依赖.
- 为了确定磁性近距离效应对观察到的现象的贡献.
主要方法:
- 在CoCr2O4 (CCO) 基板上制造 (Pt) 薄膜.
- 在低温下测量SMR和SSE.
- 对SMR和SSE的角度依赖性研究.
- 在Pt-M边缘的X射线磁二极化 (XMCD) 探测磁矩.
主要成果:
- SMR和SSE信号显示出明显的温度变化,与CCO的磁相相关.
- 系统地调查了SMR和SSE的角度依赖关系.
- 根据XMCD的数据,Pt中的磁矩是可以忽略不计的,排除了显著的磁近距离效应.
结论:
- 在Pt/CCO中观察到的SMR和SSE信号主要是由自旋电流驱动的,而不是磁性近距离.
- 这些发现为旋转电荷转换机制提供了基本的见解.
- 这项研究有助于开发利用新型材料接口的自旋电子设备.
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