Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure

Advanced Materials
Lei PanKang L Wang

Abstract

Integration of a quantum anomalous Hall insulator with a magnetically ordered material provides an additional degree of freedom through which the resulting exotic quantum states can be controlled. Here, an experimental observation is reported of the quantum anomalous Hall effect in a magnetically-doped topological insulator grown on the antiferromagnetic insulator Cr2 O3 . The exchange coupling between the two materials is investigated using field-cooling-dependent magnetometry and polarized neutron reflectometry. Both techniques reveal strong interfacial interaction between the antiferromagnetic order of the Cr2 O3 and the magnetic topological insulator, manifested as an exchange bias when the sample is field-cooled under an out-of-plane magnetic field, and an exchange spring-like magnetic depth profile when the system is magnetized within the film plane. These results identify antiferromagnetic insulators as suitable candidates for the manipulation of magnetic and topological order in topological insulator films.

References

Jun 22, 2010·Nature Materials·Xi HeChristian Binek
Nov 19, 2013·Physical Review Letters·W Echtenkamp, Ch Binek
Oct 8, 2015·Nature Communications·Xufeng KouKang L Wang
Jul 19, 2018·Nature Communications·Qing Lin HeKang L Wang
Sep 20, 2018·Physical Review Letters·Qing Lin HeKang L Wang

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Citations

Jun 30, 2021·Advanced Materials·Semonti BhattacharyyaMichael S Fuhrer

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