An anomalous Hall effect in altermagnetic ruthenium dioxide

Feng, Zexin; Zhou, Xiaorong; Šmejkal, Libor; Wu, Lei; Zhu, Zengwei; Guo, Huixin; González-Hernández, Rafael; Wang, Xiaoning; Yan, Han; Qin, Peixin; Zhang, Xin; Wu, Haojiang; Chen, Hongyu; Meng, Ziang; Liu, Li; Xia, Zhengcai; Sinova, Jairo; Jungwirth, Tomáš; Liu, Zhiqi

Abstract

The anomalous Hall effect is a time-reversal symmetry-breaking magneto-electronic phenomenon originally discovered in ferromagnets. Recently, ruthenium dioxide (RuO2) with a compensated antiparallel magnetic order has been predicted to generate an anomalous Hall effect of comparable strength to ferromagnets. The phenomenon arises from an altermagnetic phase of RuO2 with a characteristic alternating spin polarization in both real-space crystal structure and momentum-space band structure. Here we report an anomalous Hall effect in RuO2 with an anomalous Hall conductivity exceeding 1,000 Ω−1 cm−1. We combine the vector magnetometry and magneto-transport measurements of epitaxial RuO2 films of different crystallographic orientations. We show that the anomalous Hall effect dominates over an ordinary Hall contribution, and a contribution due to a weak field-induced magnetization. Our results could lead to the exploration of topological Berry phases and dissipationless quantum transport in crystals of abundant elements and with a compensated antiparallel magnetic order.

Citation

Feng, Z., Zhou, X., Šmejkal, L., Wu, L., Zhu, Z., Guo, H., …Liu, Z. (2022). An anomalous Hall effect in altermagnetic ruthenium dioxide. Nature Electronics, 5(11), 735-743. https://doi.org/10.1038/s41928-022-00866-z

• Journal Article Type: Article
• Acceptance Date: Oct 4, 2022
• Online Publication Date: Nov 7, 2022
• Publication Date: 2022-11
• Deposit Date: Dec 15, 2022
• Publicly Available Date: May 8, 2023
• Journal: Nature Electronics
• Electronic ISSN: 2520-1131
• Publisher: Springer Science and Business Media LLC
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Issue: 11
• Pages: 735-743
• DOI: https://doi.org/10.1038/s41928-022-00866-z
• Keywords: Electrical and Electronic Engineering; Instrumentation; Electronic, Optical and Magnetic Materials
• Public URL: https://nottingham-repository.worktribe.com/output/13465779
• Publisher URL: https://www.nature.com/articles/s41928-022-00866-z