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外延Ru/铁磁异质结构中晶体场介导的各向异性轨道Rashba效应的证据

Evidence of Crystal-Field-Mediated Anisotropic Orbital Rashba Effect in Epitaxial Ru/FM Heterostructure

Yu Zhang, Wenhao Niu, Yumin Yang, Wenqi Xu, Gengchen Meng, Hailong Wang, Na Lei, Dahai Wei

arXiv 2609.04642首次发表:更新:

发表机构

Institute of Semiconductors, Chinese Academy of Sciences; University of Chinese Academy of Sciences; Beihang University(中国科学院半导体研究所; 中国科学院大学; 北京航空航天大学)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

研究针对轨道Rashba纹理控制难题,在Ru/铁磁异质结构中证实晶体场介导的各向异性轨道Rashba效应,明确界面晶体场相干性对轨道力矩的关键作用,为轨道力矩调控提供新途径。

AI 中文摘要

轨道角动量的电产生为电流诱导的力矩提供了有前景的途径,但轨道Rashba纹理的有效控制仍然具有挑战性,特别是因为界面晶体场的作用在很大程度上尚未被探索。在此,我们报告了外延Ru/铁磁异质结构中晶体场介导的界面各向异性轨道Rashba效应(AORE)的实验证据。总轨道力矩被分解为各向同性的体贡献和各向异性的面内界面贡献。后者会因任一组成部分的结晶度下降以及插入Cu间隔层而被强烈抑制,这凸显了相干界面轨道杂化和Ru/铁磁直接接触的关键作用。这些结果确定了界面晶体场相干性是操纵轨道Rashba纹理的关键因素,并为设计轨道力矩的对称性和方向性建立了途径。

英文摘要

Electrical generation of orbital angular momentum provides a promising route to current-induced torques, yet effective control of orbital Rashba textures still remains challenging, particularly because the role of the interfacial crystal field remains largely unexplored. Here, we report experimental evidence for a crystal-field-mediated interfacial anisotropic orbital Rashba effect (AORE) in epitaxial Ru/ferromagnet heterostructures. Total orbital torque was disentangled into an isotropic bulk contribution and an in-plane anisotropic interfacial contribution. The latter was strongly suppressed by degrading the crystallinity of either constituent and by inserting a Cu spacer, highlighting the essential roles of coherent interfacial orbital hybridization and direct Ru/ferromagnet contact. These results identify interfacial crystal-field coherency as a key ingredient in manipulating orbital Rashba textures and establish a route toward engineering the symmetry and directionality of orbital torques.

Comments7 Pages, 4 Figures

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