Giant self spin-valve effect in the kagome helimagnet

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 TmMn<sub>6</sub>Sn<sub>6</sub>. 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.

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Publication Details

Journal
Nature Communications
Published
2025-03-17
DOI
https://doi.org/10.1038/s41467-025-57713-w
Citations
3
Primary Topic
Advanced Condensed Matter Physics
Type
article
Field-Weighted Citation Impact
3.77
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article

Giant self spin-valve effect in the kagome helimagnet

Wenjie Meng, Shuang Jia, Haifeng Du, Y. Liu et al.
3 citations
Nature Communications
Advanced Condensed Matter Physics
3.77
article

Giant self spin-valve effect in the kagome helimagnet

Wenjie Meng, Shuang Jia, Haifeng Du, Y. Liu, Ding‐Fu Shao, Tay‐Rong Chang, Xitong Xu, Qingyou Lu, Qingqi Zeng, Kesen Zhao, Miao He, Che-Min Lin, Yubin Hou, Zhe Qu, Haitian Zhao
article en
3 citations

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 TmMn<sub>6</sub>Sn<sub>6</sub>. 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.

Nature CommunicationsVol. 16(1)
University of Science and Technology of China (CN), National University of Tainan (TW), Chinese Academy of Sciences (CN), Peking University (CN), Hefei Institutes of Physical Science (CN), High Magnetic Field Laboratory (CN), National Center for Theoretical Sciences (TW), Institute of Solid State Physics (CN), University of Chinese Academy of Sciences (CN), National Cheng Kung University (TW), Stanford University (US)
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Advanced Condensed Matter Physics
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