通过优化Ta/Pt/Co三层中封闭层厚度来大大提高有效的旋转轨道扭矩效率
Zhan Xu1,2, Shuo Wu2, Runtian Li3
1School of Safety Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.
概括
在Ta/Pt/Co结构中,封闭层厚度显著影响旋转轨道扭矩 (SOT) 效率和磁性阻尼. 优化这种厚度是开发高效,低功耗的自旋电子设备的关键.
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:
- 旋转轨道扭矩 (SOT) 对于操纵旋转器件中的磁化至关重要.
- 了解接口效应和材料属性的作用对于优化SOT效率至关重要.
- Ta/Pt/Co 异构结构是先进的自旋电子应用的有希望的候选者.
研究的目的:
- 调查封闭层厚度对Ta/Pt/Co结构中SOT效率和磁性阻尼的影响.
- 为了确定最大限度地提高SOT效率的最佳封闭层厚度.
- 阐明控制观测现象的潜在物理机制.
主要方法:
- 使用了旋转扭矩铁磁共振 (ST-FMR) 测量.
- 系统地改变了封顶层 (Ta) 的厚度.
- 分析了有效的磁阻尼和SOT效率作为限制层厚度的函数.
主要成果:
- SOT效率表现出一种非单调的行为,随着封闭层厚度增加到1.4纳米 (0.199),然后下降.
- 随着封闭层厚度的增加,磁阻尼因子会降低.
- 观察到的现象归因于Rashba-Edelstein效应和净自旋电流之间的相互作用.
结论:
- 封闭层的厚度极大地影响了Ta/Pt/Co.中的SOT效率和磁性阻尼.
- 最佳的封闭层厚度 (1.4 nm) 产生高的SOT效率和低的磁性阻尼.
- Ta/Pt/Co 异构结构显示出低功率旋转子技术的巨大潜力.
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