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Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure
Author(s) -
Pan Lei,
Grutter Alexander,
Zhang Peng,
Che Xiaoyu,
Nozaki Tomohiro,
Stern Alex,
Street Mike,
Zhang Bing,
Casas Brian,
He Qing Lin,
Choi Eun Sang,
Disseler Steven M.,
Gilbert Dustin A.,
Yin Gen,
Shao Qiming,
Deng Peng,
Wu Yingying,
Liu Xiaoyang,
Kou Xufeng,
Masashi Sahashi,
Han Xiaodong,
Binek Christian,
Chambers Scott,
Xia Jing,
Wang Kang L.
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202001460
Subject(s) - topological insulator , condensed matter physics , antiferromagnetism , magnetometer , neutron reflectometry , materials science , quantum anomalous hall effect , magnetic field , heterojunction , physics , quantum hall effect , topology (electrical circuits) , neutron , quantum mechanics , neutron scattering , mathematics , combinatorics , small angle neutron scattering
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 Cr 2 O 3 . 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 Cr 2 O 3 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.