Coexistence of unconventional spin-orbit torque and in-plane Hall effect in a single ferromagnetic layer

Jiaxin Chen; Hongsheng Zheng; Hongliang Chen; Qia Shen; Chang Pan; Zhenyi Zheng; Hemian Yi; Dandan Guan; Xiaoxue Liu; Yaoyi Li; Shiyong Wang; Hao Zheng; Canhua Liu; Jinfeng Jia; Jingsheng Chen; Ruidan Zhong; Lei Wang; Xuepeng Qiu; Yumeng Yang; Aurélien Manchon; Liang Liu

arXiv · 2511.17231

Coexistence of unconventional spin-orbit torque and in-plane Hall effect in a single ferromagnetic layer

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Abstract

The symmetry of a material fundamentally governs its spin transport properties. While unconventional spin transport phenomena have been predominantly explored in low-symmetry systems (e.g., $C_{1v}$ symmetry), high-symmetry crystals--which constitute the majority of industry-compatible materials--are generally expected to exhibit only conventional spin-transport behavior. Here, we report the coexistence of two unconventional spin transport effects, the crystal spin-orbit torque (CSOT) and the crystal in-plane Hall effect (CIHE), in a CoPt single ferromagnetic layer with $C_{3v}$ symmetry. Leveraging the CSOT, we achieve nearly 100% field-free perpendicular magnetization switching in a 6 nm CoPt layer at room temperature. Simultaneously, the CIHE observed in this material exhibits nearly identical dependencies on both current angle and growth temperature as the CSOT. Symmetry analysis confirms that both effects share a common physical origin. Our work not only establishes CoPt as a high-performance spin-orbit material, but also demonstrates that unconventional spin transport can be realized in high-symmetry systems, thereby opening a broad pathway for their application in practical spintronics.

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Jiaxin Chen, Hongsheng Zheng, Hongliang Chen, Qia Shen, Chang Pan, Zhenyi Zheng, Hemian Yi, Dandan Guan, Xiaoxue Liu, Yaoyi Li, Shiyong Wang, Hao Zheng, Canhua Liu, Jinfeng Jia, Jingsheng Chen, Ruidan Zhong, Lei Wang, Xuepeng Qiu, Yumeng Yang, Aurélien Manchon, Liang Liu. 2025-11-21. Coexistence of unconventional spin-orbit torque and in-plane Hall effect in a single ferromagnetic layer. https://arxiv.org/abs/2511.17231

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