Exploring the Epitaxial Growth Kinetics and Anomalous Hall Effect in Magnetic Topological Insulator MnBi2Te4 Films
Article
Article Title | Exploring the Epitaxial Growth Kinetics and Anomalous Hall Effect in Magnetic Topological Insulator MnBi2Te4 Films |
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ERA Journal ID | 35029 |
Article Category | Article |
Authors | Luo, Jiangfan, Tong, Qiwei, Jiang, Zhicheng, Bai, Hui, Wu, Jinsong, Liu, Xiaolin, Xie, Sen, Ge, Haoran, Zhao, Yan, Liu, Yong, Hong, Min, Shen, Dawei, Zhang, Qingjie, Liu, Wei and Tang, Xinfeng |
Journal Title | ACS Nano |
Journal Citation | 17 (19), pp. 19022-19032 |
Number of Pages | 11 |
Year | 2023 |
Publisher | American Chemical Society |
Place of Publication | United States |
ISSN | 1936-0851 |
1936-086X | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acsnano.3c04626 |
Web Address (URL) | https://pubs.acs.org/doi/full/10.1021/acsnano.3c04626 |
Abstract | The discovery of MnBi2Te4-based intrinsic magnetic topological insulators has fueled tremendous interest in condensed matter physics, owing to their potential as an ideal platform for exploring the quantum anomalous Hall effect and other magnetism–topology interactions. However, the fabrication of single-phase MnBi2Te4 films remains a common challenge in the research field. Herein, we present an effective and simple approach for fabricating high-quality, near-stoichiometric MnBi2Te4 films by directly matching the growth rates of intermediate Bi2Te3 and MnTe. Through systematic experimental studies and thermodynamic calculations, we demonstrate that binary phases of Bi2Te3 and MnTe are easily formed during film growth, and the reaction of Bi2Te3 + MnTe → MnBi2Te4 represents the rate-limiting step among all possible reaction paths, which could result in the presence of Bi2Te3 and MnTe impurity phases in the grown MnBi2Te4 films. Moreover, Bi2Te3 and MnTe impurities introduce negative and positive anomalous Hall (AH) components, respectively, in the AH signals of MnBi2Te4 films. Our work suggests that further manipulation of growth parameters should be the essential route for fabricating phase-pure MnBi2Te4 films. |
Keywords | angle-resolved photoemission spectroscopy; MnBi2Te4 films; magnetic topological insulator; growth kinetics |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Wuhan University of Technology, China |
Chinese Academy of Sciences, China | |
School of Engineering | |
Centre for Future Materials | |
University of Science and Technology of China, Hefei, China |
https://research.usq.edu.au/item/z2649/exploring-the-epitaxial-growth-kinetics-and-anomalous-hall-effect-in-magnetic-topological-insulator-mnbi2te4-films
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