Electrical manipulation of spin splitting torque in altermagnetic RuO2

Yichi Zhang, Hua Bai, Jiankun Dai, Lei Han, Chong Chen, Shixuan Liang, Yanzhang Cao, Yingying Zhang, Qian Wang, Wenxuan Zhu, Feng Pan and Cheng Song ()
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Yichi Zhang: Tsinghua University
Hua Bai: Tsinghua University
Jiankun Dai: Tsinghua University
Lei Han: Tsinghua University
Chong Chen: Tsinghua University
Shixuan Liang: Tsinghua University
Yanzhang Cao: Tsinghua University
Yingying Zhang: Tsinghua University
Qian Wang: Tsinghua University
Wenxuan Zhu: Tsinghua University
Feng Pan: Tsinghua University
Cheng Song: Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Due to nonrelativistic altermagnetic spin splitting effect (ASSE), altermagnets can generate time-reversal-odd spin current and spin splitting torque (SST) with spin polarization parallel to the Néel vector. Hence the effective manipulation of SST would provide plenty of opportunities for designable spintronic devices. Here, we achieve electrical control of SST in altermagnetic RuO2, based on controllable Néel vector of RuO2 and Néel vector-dependent generation of SST. To demonstrate the current-induced switching of Néel vector via spin-orbit torque in RuO2 films, we use electrical transport measurements and X-ray magnetic linear dichroism (XMLD) measurements. The switching of Néel vector to the current direction and resultantly enhanced spin polarization parallel to the Néel vector brings about stronger ASSE-induced spin current. These findings not only enrich our understanding of the properties of altermagnets but also pave the way for high-speed memories and nano-oscillators with excellent controllability and efficiency.

Date: 2025
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DOI: 10.1038/s41467-025-60891-2

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