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

doi:10.1038/s41928-022-00866-z

Authors

Zexin Feng

Xiaorong Zhou

Libor Šmejkal

Lei Wu

Zengwei Zhu

Huixin Guo

Rafael González-Hernández

Xiaoning Wang

Han Yan

Peixin Qin

Xin Zhang

Haojiang Wu

Hongyu Chen

Ziang Meng

Li Liu

Zhengcai Xia

Jairo Sinova

TOMAS JUNGWIRTH tomas.jungwirth@nottingham.ac.uk
Research Professor of Ferromagnetic Semiconductors

Zhiqi Liu

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	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