域壁运动和Pt/Co/RuO2中的界面Dzyaloshinskii-Moriya交互
Milad Jalali1, Kai Wang2, Haoxiang Xu1
1School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
Materials (Basel, Switzerland)
|September 13, 2025
概括
超薄磁中的界面Dzyaloshinskii-Moriya相互作用 (DMI) 对旋转器件至关重要. 研究人员研究了RuO2覆盖的多层中的域壁动态,发现了改变的旋转轨道相互作用和增强的DMI,为先进的旋转电子学铺平了道路.
科学领域:
- 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
- 这就是Spintronics.
背景情况:
- 界面Dzyaloshinskii-Moriya相互作用 (DMI) 对于稳定磁膜中的奇拉旋转纹理至关重要,对于旋转应用至关重要.
- 了解域壁 (DW) 动态是控制下一代设备这些纹理的关键.
研究的目的:
- 研究RuO2集成对DMI和Ta/Pt/Co/Ru/O2/Pt多层域壁动态的影响.
- 用控制堆来比较RuO2覆盖膜的磁性和DW行为.
主要方法:
- 使用磁铁喷射制造Ta/Pt/Co/Ru(O2) /Pt多层的制造.
- 使用振动样本磁力测量 (VSM) 进行磁性特性和极磁光克尔效应 (P-MOKE) 强制性特征的表征.
- 通过克尔显微镜的域壁可视化和使用布里卢恩光散射 (BLS) 光谱的自旋波传播分析.
- 微磁模拟以证实实验发现.
主要成果:
- 该Pt/Co/RuO2系统的DMI常数为~1.08mJ/m2,高于Pt/Co/Ru (~1.03mJ/m2) 和显著高于Pt/Co (~0.23mJ/m2).
- 在平面内场下,RuO2覆盖的薄膜显示出明显的域壁速度不对称,与Pt/Co/Pt.中的对称行为不同.
- 尽管定场较低,但Ru-capped样本显示域壁运动更快,表明定减少.
结论:
- 将RuO2集成到Pt/Co多层中显著改变了接口旋转轨道相互作用.
- 含有RuO2的薄膜中增强的DMI和改变的域壁动态显示了先进的旋转电子设备应用的前景.
- RuO2集成提供了一条调整磁性特性以提高设备性能的途径.
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