鲁德曼-基特尔-卡苏亚-约西达型中间层Dzyaloshinskii-Moriya在合成磁铁中的相互作用
Shixuan Liang1, Ruyi Chen1, Qirui Cui2
1Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Nano letters
|September 11, 2023
概括
研究人员在合成磁铁中发现了一种新的不对称层间相互作用,即Ruderman-Kittel-Kasuya-Yosida (RKKY) 类型的Dzyaloshinskii-Moriya相互作用 (DMI). 这一发现引入了不对称的磁性合,扩大了自旋电子和磁性存储的可能性.
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:
- 鲁德曼-基特尔-卡苏亚-约西达 (RKKY) 相互作用通过导电电子旋转介导对称的层间磁性合.
- 对于先进的自旋电子学来说至关重要的不对称层间磁相互作用在很大程度上仍未被探索.
- 现有的RKKY相互作用主要建立对称的磁性合.
研究的目的:
- 调查和报告一个前所未有的RKKY型间层Dzyaloshinskii-Moriya相互作用 (DMI) 的存在.
- 描述这种新型不对称的层间磁性合的特性和依赖性.
- 阐明负责在合成磁铁中产生介层DMI的基本机制.
主要方法:
- 使用Fert-Lévy模型应用于三层磁体系统的理论建模.
- 对表现出层间合的合成磁铁进行实验研究.
- 对发现的相互作用的抑制振荡特征的分析.
主要成果:
- 在合成磁体中发现了一种新的RKKY型间层Dzyaloshinskii-Moriya相互作用 (DMI).
- 观察到的DMI表现出一个减弱的振荡行为.
- 不对称层间相互作用的强度高度依赖于中间合层.
- 在平面内反向对称性破坏被确定为产生介层DMI的关键.
结论:
- 这项研究引入并证实了RKKY型间层DMI的存在,填补了对不对称磁性合的理解上的差距.
- 这些发现强调了对称性破坏在产生异国情调的磁相互作用中的重要性.
- RKKY振荡是金属多层的内在性质,为自旋电子设备设计提供了新的途径.
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