Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure
Abstract
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 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.
- Authors:
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- Department of Electrical and Computer Engineering University of California Los Angeles CA 90095 USA
- NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg MD 20899‐6102 USA
- Department of Electronic Engineering Tohoku University Sendai 980‐8579 Japan
- Department of Physics and Astronomy University of California Irvine CA 92697 USA
- Department of Physics and Astronomy University of Nebraska Lincoln NE 68588 USA
- Beijing Key Lab of Microstructure and Property of Advanced Materials Beijing University of Technology Beijing 100124 China
- Department of Electrical and Computer Engineering University of California Los Angeles CA 90095 USA, International Center for Quantum Materials School of Physics Peking University Beijing 100871 China
- National High Magnetic Field Laboratory Florida State University Tallahassee FL 32310‐3706 USA
- Department of Materials Science University of Tennessee Knoxville TN 37996 USA
- Department of Electrical and Computer Engineering University of California Los Angeles CA 90095 USA, Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
- School of Information Science and Technology ShanghaiTech University Shanghai 200031 China
- Physical and Computational Sciences Directorate Pacific Northwest National Laboratory Richland WA 99352 USA
- Department of Electrical and Computer Engineering University of California Los Angeles CA 90095 USA, Department of Materials Science and Engineering University of California Los Angeles CA 90095 USA, Department of Physics University of California Los Angeles CA 90095 USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1640256
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Advanced Materials
- Additional Journal Information:
- Journal Name: Advanced Materials Journal Volume: 32 Journal Issue: 34; Journal ID: ISSN 0935-9648
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
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, and Wang, Kang L. Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure. Germany: N. p., 2020.
Web. doi:10.1002/adma.202001460.
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. Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure. Germany. https://doi.org/10.1002/adma.202001460
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, and Wang, Kang L. Tue .
"Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure". Germany. https://doi.org/10.1002/adma.202001460.
@article{osti_1640256,
title = {Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure},
author = {Pan, Lei and Grutter, Alexander and Zhang, Peng and Che, Xiaoyu and Nozaki, Tomohiro and Stern, Alex and Street, Mike and Zhang, Bing and Casas, Brian and He, Qing Lin and Choi, Eun Sang and Disseler, Steven M. and Gilbert, Dustin A. and Yin, Gen and Shao, Qiming and Deng, Peng and Wu, Yingying and Liu, Xiaoyang and Kou, Xufeng and Masashi, Sahashi and Han, Xiaodong and Binek, Christian and Chambers, Scott and Xia, Jing and Wang, Kang L.},
abstractNote = {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 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.},
doi = {10.1002/adma.202001460},
journal = {Advanced Materials},
number = 34,
volume = 32,
place = {Germany},
year = {Tue Jul 21 00:00:00 EDT 2020},
month = {Tue Jul 21 00:00:00 EDT 2020}
}
https://doi.org/10.1002/adma.202001460
Web of Science
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