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

@misc{zhang2026evidence,
  title = {{Evidence of Crystal-Field-Mediated Anisotropic Orbital Rashba Effect in Epitaxial Ru/FM Heterostructure}},
  author = {Yu Zhang and Wenhao Niu and Yumin Yang and Wenqi Xu and Gengchen Meng and Hailong Wang and Na Lei and Dahai Wei},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.04642},
  eprint = {2609.04642},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.04642},
}

TY  - UNPB
TI  - Evidence of Crystal-Field-Mediated Anisotropic Orbital Rashba Effect in Epitaxial Ru/FM Heterostructure
AU  - Yu Zhang
AU  - Wenhao Niu
AU  - Yumin Yang
AU  - Wenqi Xu
AU  - Gengchen Meng
AU  - Hailong Wang
AU  - Na Lei
AU  - Dahai Wei
PY  - 2026
DA  - 2026/09/04
PB  - arXiv
DO  - 10.48550/arxiv.2609.04642
UR  - https://arxiv.org/abs/2609.04642
AB  - 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.
ER  -