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

反铁磁性 铁磁性 磁性 凝聚态物理 超晶格 自旋电子学 基态 联轴节(管道) 量子 材料科学 蜂巢 物理 拓扑(电路) 量子力学 组合数学 复合材料 冶金 数学
作者
Xiaolong Xu,Shiqi Yang,Huan Wang,Roger Guzmán,Y.C. Gao,Yongfeng Zhu,Yuxuan Peng,Zhihao Zang,Ming Xi,Shangjie Tian,Yanping Li,Hechang Lei,Zhaochu Luo,Jinbo Yang,Yeliang Wang,Tian‐Long Xia,Wu Zhou,Yuan Huang,Yongqin Yu
出处
期刊:Nature Communications [Nature Portfolio]
卷期号:13 (1) 被引量:5
标识
DOI:10.1038/s41467-022-35184-7
摘要

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.
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