Ferromagnetic-antiferromagnetic coexisting ground state and exchange bias effects in MnBi4Te7 and MnBi6Te10

Xiaolong Xu, Shiqi Yang, Huan Wang, Roger Guzman, Yuchen Gao, Yaozheng Zhu, Yuxuan Peng, Zhihao Zang, Ming Xi, Shangjie Tian, Yanping Li, Hechang Lei, Zhaochu Luo, Jinbo Yang, Yeliang Wang, Tianlong Xia (), Wu Zhou (), Yuan Huang () and Yu Ye ()
Additional contact information
Xiaolong Xu: Peking University
Shiqi Yang: Peking University
Huan Wang: Renmin University of China
Roger Guzman: University of Chinese Academy of Sciences
Yuchen Gao: Peking University
Yaozheng Zhu: Peking University
Yuxuan Peng: Peking University
Zhihao Zang: Peking University
Ming Xi: Renmin University of China
Shangjie Tian: Renmin University of China
Yanping Li: Peking University
Hechang Lei: Renmin University of China
Zhaochu Luo: Peking University
Jinbo Yang: Peking University
Yeliang Wang: Beijing Institute of Technology
Tianlong Xia: Renmin University of China
Wu Zhou: University of Chinese Academy of Sciences
Yuan Huang: Beijing Institute of Technology
Yu Ye: Peking University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Natural superlattice structures MnBi2Te4(Bi2Te3)n (n = 1, 2, ...), in which magnetic MnBi2Te4 layers are separated by nonmagnetic Bi2Te3 layers, hold band topology, magnetism and reduced interlayer coupling, providing a promising platform for the realization of exotic topological quantum states. However, their magnetism in the two-dimensional limit, which is crucial for further exploration of quantum phenomena, remains elusive. Here, complex ferromagnetic-antiferromagnetic coexisting ground states that persist down to the 2-septuple layers limit are observed and comprehensively investigated in MnBi4Te7 (n = 1) and MnBi6Te10 (n = 2). The ubiquitous Mn-Bi site mixing modifies or even changes the sign of the subtle interlayer magnetic interactions, yielding a spatially inhomogeneous interlayer coupling. Further, a tunable exchange bias effect, arising from the coupling between the ferromagnetic and antiferromagnetic components in the ground state, is observed in MnBi2Te4(Bi2Te3)n (n = 1, 2), which provides design principles and material platforms for future spintronic devices. Our work highlights a new approach toward the fine-tuning of magnetism and paves the way for further study of quantum phenomena in MnBi2Te4(Bi2Te3)n (n = 1, 2) as well as their magnetic applications.

Date: 2022
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DOI: 10.1038/s41467-022-35184-7

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