Статья

Fully Field‐Free Spin‐Orbit Torque Switching Induced by Spin Splitting Effect in Altermagnetic RuO<sub>2</sub>

Zhuoyi LiJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaZhe ZhangJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaYuzhe ChenJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaSicong HuJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaYingjie JiJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaYan YuJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaJun DuDepartment of Physics Nanjing University Nanjing 210093 ChinaYao LiNational Key Laboratory of Spintronics Nanjing University Suzhou 215163 ChinaLiang HeJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaXuefeng WangJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaJing WuSchool of Integrated Circuits Guangdong University of Technology Guangzhou 510006 ChinaRong ZhangJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaYongbing XuJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 ChinaXianyang LuJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 China

2025en

ABI

Аннотация

Abstract Altermagnetism, a newly identified class of magnetism blending characteristics of both ferromagnetism and antiferromagnetism, is emerging as a compelling frontier in spintronics. This study reports a groundbreaking discovery of robust, 100% field‐free spin‐orbit torque (SOT) switching in a RuO 2 (101)/[Co/Pt] 2 /Ta structure. The experimental results reveal that the spin currents, induced by the in‐plane charge current, flow along the [100] axis, with the spin polarization direction aligned parallel to the Néel vector. These z‐polarized spins generate an out‐of‐plane anti‐damping torque, enabling deterministic switching of the Co/Pt layer without the necessity of an external magnetic field. The altermagnetic spin splitting effect (ASSE) in RuO 2 promotes the generation of spin currents with pronounced anisotropic behavior, maximized when the charge current flows along the [010] direction. This unique capability yields the highest field‐free switching ratio, maintaining stable SOT switching even under a wide range of external magnetic fields, demonstrating exceptional resistance to magnetic interference. Notably, the ASSE‐dominated spin current is found to be most effective when the current is aligned with the [010] direction. The study highlights the potential of RuO 2 as a powerful spin current generator, opening new avenues for advancing spin‐torque switching technologies and other cutting‐edge spintronic devices.

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Идентификаторы

DOI: 10.1002/adma.202416712

Цитирования и источники

Цитирований: 2Использованных источников: 0

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