Exchange interactions in topological/antiferromagnetic heterostructures

Performing ab initio calculations, we investigate exchange interactions between the topological insulator and the antiferromagnetic films in detail. In this work, choosing the Bi2Te3/CrSb heterostructure as a typical model system, we prove that the magnitude of the magnetic anisotropy and the spin d...

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Bibliographic Details
Published in:Applied physics letters 2021-02, Vol.118 (6)
Main Authors: Chen, RongRong, Dou, Shuang, Stepanyuk, V. S., Xue, DeSheng, Jia, ChengLong, Tao, Kun
Format: Article
Language:English
Subjects:
Antiferromagnetism
Applied physics
Bismuth tellurides
Exchanging
Heterostructures
Magnetic anisotropy
Magnetic moments
Stacking
Topological insulators
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Summary:Performing ab initio calculations, we investigate exchange interactions between the topological insulator and the antiferromagnetic films in detail. In this work, choosing the Bi2Te3/CrSb heterostructure as a typical model system, we prove that the magnitude of the magnetic anisotropy and the spin direction of heterostructures can be manipulated by tuning the interfacial exchange coupling with the stacking modes between the Bi2Te3 and the CrSb films. The exchange gap in various heterostructures ranges from 21.1 meV in the type-C stacking to 36.2 meV in the type-B stacking. We demonstrate that the magnetic anisotropy energy of the system originates from the hybridization between different atomic orbitals at the interface. Moreover, large induced magnetic moments were found at the interface.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0039741