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Giant self spin-valve effect in the kagome helimagnet

Author

Listed:
  • Xitong Xu

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Yonglai Liu

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Kesen Zhao

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Che-Min Lin

    (National Cheng Kung University
    Stanford University)

  • Miao He

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Haitian Zhao

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Qingqi Zeng

    (Chinese Academy of Sciences)

  • Yubin Hou

    (Chinese Academy of Sciences)

  • Qingyou Lu

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Ding-Fu Shao

    (Chinese Academy of Sciences)

  • Shuang Jia

    (Peking University
    Peking University
    University of Chinese Academy of Sciences)

  • Haifeng Du

    (Chinese Academy of Sciences)

  • Wenjie Meng

    (Chinese Academy of Sciences)

  • Tay-Rong Chang

    (National Cheng Kung University
    Center for Quantum Frontiers of Research and Technology (QFort)
    National Center for Theoretical Sciences)

  • Zhe Qu

    (Chinese Academy of Sciences
    University of Science and Technology of China)

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.

Suggested Citation

  • 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 & Zhe Qu, 2025. "Giant self spin-valve effect in the kagome helimagnet," Nature Communications, Nature, vol. 16(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57713-w
    DOI: 10.1038/s41467-025-57713-w
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