Giant self spin-valve effect in the kagome helimagnet

Xitong Xu (), Yonglai Liu, Kesen Zhao, Che-Min Lin, Miao He, Haitian Zhao, Qingqi Zeng, Yubin Hou, Qingyou Lu, Ding-Fu Shao, Shuang Jia, Haifeng Du, Wenjie Meng (), Tay-Rong Chang () and Zhe Qu ()
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Xitong Xu: Chinese Academy of Sciences
Yonglai Liu: Chinese Academy of Sciences
Kesen Zhao: Chinese Academy of Sciences
Che-Min Lin: National Cheng Kung University
Miao He: Chinese Academy of Sciences
Haitian Zhao: Chinese Academy of Sciences
Qingqi Zeng: Chinese Academy of Sciences
Yubin Hou: Chinese Academy of Sciences
Qingyou Lu: Chinese Academy of Sciences
Ding-Fu Shao: Chinese Academy of Sciences
Shuang Jia: Peking University
Haifeng Du: Chinese Academy of Sciences
Wenjie Meng: Chinese Academy of Sciences
Tay-Rong Chang: National Cheng Kung University
Zhe Qu: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Kagome magnets can combine non-trivial band topology and electron correlations, offering a versatile playground for various quantum phenomena. In this work we propose that kagome magnets with frustrated interlayer interactions can intrinsically support a self spin-valve effect, and experimentally confirm this in the kagome helimagnet TmMn6Sn6. Under a magnetic field perpendicular to the helical axis, using magnetic force microscopy we observed stripe domains that stack strictly along the helical axis, which we attribute to the stability loss of the kagome helimagnetic state. Such a domain pattern spontaneously mimics the artificial multilayered structure in traditional spin valves, which, combined with the high spin polarization, leads to a giant magnetoresistance (GMR) ratio over 160%. This discovery opens an avenue to realize inherent spin valves in a variety of quantum magnets, and can hold promise in future spintronics.

Date: 2025
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DOI: 10.1038/s41467-025-57713-w

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