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., González-Hernández, R., Wang, X., Yan, H., Qin, P., Zhang, X., Wu, H., Chen, H., Meng, Z., Liu, L., Xia, Z., Sinova, J., Jungwirth, T., & 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: Nature Research
• 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