Spin-Orbit Coupling Driven Magnetic Response in Altermagnetic RuO2

Jeongkeun Song; Seung Hun Lee; San Kang; Donghan Kim; Ji Hwan Jeong; Taekoo Oh; Sangjae Lee; Suyoung Lee; Sangmin Lee; Kyo-Hoon Ahn; Kwan-Woo Lee; Miyoung Kim; Tae Won Noh; Bohm-Jung Yang; Changyoung Kim

doi:10.1002/smll.202407722

Spin-Orbit Coupling Driven Magnetic Response in Altermagnetic RuO₂

Small. 2024 Nov 20:e2407722. doi: 10.1002/smll.202407722. Online ahead of print.

Authors

Jeongkeun Song^{1

2}, Seung Hun Lee^{1

2

3}, San Kang^{1

2}, Donghan Kim^{1

2}, Ji Hwan Jeong^{1

2}, Taekoo Oh⁴, Sangjae Lee⁵, Suyoung Lee^{1

2}, Sangmin Lee⁶, Kyo-Hoon Ahn⁷, Kwan-Woo Lee⁸, Miyoung Kim⁶, Tae Won Noh^{1

2}, Bohm-Jung Yang^{1

3

9}, Changyoung Kim^{1

2}

Affiliations

¹ Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea.
² Center for Correlated Electron Systems, IBS, Seoul, 08826, South Korea.
³ Institute of Applied Physics, Seoul National University, Seoul, 08826, South Korea.
⁴ RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.
⁵ The Research Institute of Basic Sciences, Seoul National University, Seoul, 08826, South Korea.
⁶ Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea.
⁷ Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, Praha 6, 162 00, Czech Republic.
⁸ Division of Display and Semiconductor Physics, Korea University, Sejong, 33019, South Korea.
⁹ Center for Theoretical Physics (CTP), Seoul National University, Seoul, 08826, South Korea.

PMID: 39568241
DOI: 10.1002/smll.202407722

Abstract

The recent prediction of the new magnetic class, altermagnetism, has drawn considerable interest, fueled by its potential to host novel phenomena and to be utilized in next-generation spintronics devices. Among many promising candidates, rutile RuO₂ is a prototypical candidate for realizing the prospects of altermagnetism. However, the experimental studies on RuO₂ are still in the early stages. In this study, the magnetic responses in RuO₂ film are investigated by the Planar Hall effect (PHE). By rotating the external field (H_ext), the PHE exhibits twofold behaviors. Moreover, the planar Hall conductivity shows a nonlinear response to the H_ext. These observed features in PHE resemble those in ferromagnet and topologically nontrivial systems, suggesting the field-induced magnetic response in rutile antiferromagnet. The work provides a strategy for detecting intriguing magnetic responses in altermagnetic materials, promoting further research in altermagnet-based spintronics and novel phenomena.

Keywords: RuO2; altermagnetism; oxide thin film; spin‐orbit coupling; transport.

Abstract

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