Intrinsic exchange biased anomalous Hall effect in an uncompensated antiferromagnet MnBi2Te4

Su Kong Chong (), Yang Cheng, Huiyuan Man, Seng Huat Lee, Yu Wang, Bingqian Dai, Masaki Tanabe, Ting-Hsun Yang, Zhiqiang Mao, Kathryn A. Moler and Kang L. Wang ()
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Su Kong Chong: University of California
Yang Cheng: University of California
Huiyuan Man: Stanford University
Seng Huat Lee: The Pennsylvania State University
Yu Wang: 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
Kathryn A. Moler: Stanford University
Kang L. Wang: University of California

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-46689-8

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