通过轨道杂交,增强Rashba的脊柱分裂强度
Qihan Zhang1, Peng Li2, Heng-An Zhou1,3
1Department of Materials Science and Engineering, National University of Singapore, Singapore117575, Singapore.
ACS nano
|December 20, 2024
概括
在六角化/Co3Pt异构结构中的轨道杂交增强了Rashba效应,提高了节能旋转器件的旋转轨道扭矩效率.
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:
- 拉什巴效应是由反转对称性破坏和旋转轨道合驱动的,它促进了电荷-旋转互转,但由于界面不对称性有限,它往往很弱.
- 提高旋转分裂强度对于提高旋转轨道扭矩 (SOT) 效率至关重要,旨在降低功耗.
研究的目的:
- 研究轨道杂交对Rashba旋转分裂和SOT效率在六角化 (h-BN) /Co3Pt异构结构中的影响.
- 探索用于增强Rashba效应和材料系统中的SOT效率的接口控制策略.
主要方法:
- 使用第一原理计算来分析电子结构,并预测h-BN/Co3Pt接口上的Rashba旋转分裂.
- 使用磁铁喷射,在具有垂直磁性异性质的Co3Pt层上实验合成大面积的h-BN.
主要成果:
- 计算显示了Rashba显著的旋转分裂,原因是外平面p-d轨道杂交和在接口上的旋转轨道合.
- 观察到SOT效率的提高归因于Rashba效应,具有异常的温度依赖性.
- 检测到主要的缓冲式扭矩,导致更低的值切换电流密度和更好的切换比率.
结论:
- 在h-BN/Co3Pt接口的轨道杂交有效地提高了Rashba旋转分裂和SOT效率.
- 这些发现为界面工程提供了一条途径,以优化自旋电子设备的性能.
- 这项研究有助于通过增强的界面控制来开发节能的自旋电子设备.
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