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Ferromagnetic-antiferromagnetic coexisting ground state and exchange bias effects in MnBi4Te7 and MnBi6Te10
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Ferromagnetic-antiferromagnetic coexisting ground state and exchange bias effects in MnBi4Te7 and MnBi6Te10
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Journal Article
Ferromagnetic-antiferromagnetic coexisting ground state and exchange bias effects in MnBi4Te7 and MnBi6Te10
2022
Overview
Natural superlattice structures MnBi
2
Te
4
(Bi
2
Te
3
)
n
(
n
= 1, 2, ...), in which magnetic MnBi
2
Te
4
layers are separated by nonmagnetic Bi
2
Te
3
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 MnBi
4
Te
7
(
n
= 1) and MnBi
6
Te
10
(
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 MnBi
2
Te
4
(Bi
2
Te
3
)
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 MnBi
2
Te
4
(Bi
2
Te
3
)
n
(
n
= 1, 2) as well as their magnetic applications.
MnBi
2
Te
4
and Bi
2
Te
3
can form natural superlattices, where the MnBi
2
Te
4
layers are separated by multiples of Bi
2
Te
3
. The combination of these two materials offers a potential platform for the interplay of tunable magnetism and topology. Here, the authors show that MnBi
4
Te
7
and MnBi
6
Te
10
display a complex magnetic ground state with coexisting ferromagnetic and antiferromagnetic domains.
