由低晶体对称度引起的异常自旋电流生成
Yanrong Song1, Zhenhua Zhang2,3, Wancheng Zhang2,3
1Key Laboratory of Artificial Micro- and Nanostructures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
Nano letters
|December 3, 2025
概括
低对称的单晶材料可以产生非常规的自旋电流,用于无磁场的磁化切换. 在室温下,Monoclinic WO2有效地驱动了旋转轨道扭矩切换在室温下的旋转器件中.
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:
- 使用旋转轨道扭矩 (SOT) 的垂直磁化无场切换对于先进的半导体和逻辑设备至关重要.
- 现有的方法来打破SOT的镜像对称性往往涉及复杂的技术.
- 低对称性材料提供了一种潜在的途径,可以简化用于旋转电流生成的对称性破坏.
研究的目的:
- 为了研究低对称性单临床材料在产生非传统的自旋电流方面的潜力.
- 通过使用来自单临床材料的自旋电流来演示无场SOT切换.
- 探索晶体学方向在旋转电流偏振和SOT效率中的作用.
主要方法:
- 低对称单临床晶体结构的对称性分析.
- 旋转扭矩铁磁共振 (ST-FMR) 的实验.
- 在单临床WO2中对旋转电流生成和磁化开关的研究.
主要成果:
- 单临床WO2被确定为一种能够破坏自旋电流偏振对称性保护的材料.
- 在WO2中产生了异平面极化自旋电流,这取决于电流流的结晶学方向.
- 在单临床WO2中,在室温下实现了垂直磁化的高效无场SOT切换.
结论:
- 低对称性材料,如单临床WO2,可以作为高效的旋转来源,用于旋转电子应用.
- 通过利用晶体对称度,可以产生具有特定偏振的非常规自旋电流.
- 这种方法为实现无现场SOT交换提供了一条简化途径,为未来的自旋电子设备带来了广泛的前景.
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