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Intrinsic exchange biased anomalous Hall effect in an uncompensated antiferromagnet MnBi2Te4

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Listed:
  • Su Kong Chong

    (University of California)

  • Yang Cheng

    (University of California)

  • Huiyuan Man

    (Stanford University
    Stanford University)

  • Seng Huat Lee

    (The Pennsylvania State University
    The Pennsylvania State University)

  • Yu Wang

    (The Pennsylvania State University
    The Pennsylvania State University)

  • Bingqian Dai

    (University of California)

  • Masaki Tanabe

    (University of California)

  • Ting-Hsun Yang

    (University of California)

  • Zhiqiang Mao

    (The Pennsylvania State University
    The Pennsylvania State University)

  • Kathryn A. Moler

    (Stanford University
    SLAC National Accelerator Laboratory
    Stanford University)

  • Kang L. Wang

    (University of California)

Abstract

Achieving spin-pinning at the interface of hetero-bilayer ferromagnet/antiferromagnet structures in conventional exchange bias systems can be challenging due to difficulties in interface control and the weakening of spin-pinning caused by poor interface quality. In this work, we propose an alternative approach to stabilize the exchange interaction at the interface of an uncompensated antiferromagnet by utilizing a gradient of interlayer exchange coupling. We demonstrate this exchange interaction through a designed field training protocol in the odd-layer topological antiferromagnet MnBi2Te4. Our results reveal a remarkable field-trained exchange bias of up to ~ 400 mT, which exhibits high repeatability and can be easily reset by a large training field. Notably, this field-trained exchange bias effect persists even with zero-field initialization, presenting a stark contrast to the traditional field-cooled exchange bias. The highly tunable exchange bias observed in this single antiferromagnet compound, without the need for an additional magnetic layer, provides valuable insight into the exchange interaction mechanism. These findings pave the way for the systematic design of topological antiferromagnetic spintronics.

Suggested Citation

  • Su Kong Chong & Yang Cheng & Huiyuan Man & Seng Huat Lee & Yu Wang & Bingqian Dai & Masaki Tanabe & Ting-Hsun Yang & Zhiqiang Mao & Kathryn A. Moler & Kang L. Wang, 2024. "Intrinsic exchange biased anomalous Hall effect in an uncompensated antiferromagnet MnBi2Te4," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46689-8
    DOI: 10.1038/s41467-024-46689-8
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    2. Ella Lachman & Ryan A. Murphy & Nikola Maksimovic & Robert Kealhofer & Shannon Haley & Ross D. McDonald & Jeffrey R. Long & James G. Analytis, 2020. "Exchange biased anomalous Hall effect driven by frustration in a magnetic kagome lattice," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
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