Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure
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 Cr2O3. 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 Cr2O3 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 21, 2020
- Source ID
- 10.1002/adma.202001460
Entities
People
- Alex Stern
- Alexander J. Grutter
- Bing Zhang
- Brian Casas
- Christian Binek
- Dustin A Gilbert
- Eun Sang Choi
- Gen Yin
- Jing Xia
- Kang L. Wang
- Lei Pan
- Mike Street
- Peng Deng
- Peng Zhang
- Qiming Shao
- Qing Lin He
- Sahashi Masashi
- Scott A. Chambers
- Steven M. Disseler
- Tomohiro Nozaki
- Xiaodong Han
- Xiaoyang Liu
- Xiaoyu Che
- Xufeng Kou
- Yingying Wu
Organizations
- Army Research Office
- Beijing University of Technology
- Florida State University
- Hong Kong University of Science and Technology
- National High Magnetic Field Laboratory
- National Institute of Standards and Technology
- National Natural Science Foundation of China
- National Science Foundation
- Office of Basic Energy Sciences
- Office of Science
- Pacific Northwest National Laboratory
- Peking University
- Program 973
- ShanghaiTech University
- Tohoku University
- United States Department of Energy
- University of California
- University of Nebraska–Lincoln
- University of Tennessee