Controllable Synthesis of High-Quality Magnetic Topological Insulator MnBi<sub>2</sub>Te<sub>4</sub> and MnBi<sub>4</sub>Te<sub>7</sub> Multilayers by Chemical Vapor Deposition
With a nontrivial topological band and intrinsic magnetic order, two-dimensional (2D) MnBi<sub>2</sub>Te<sub>4</sub>-family materials exhibit great promise for exploring exotic quantum phenomena and potential applications. However, the synthesis of 2D MnBi<sub>2</sub>Te<sub>4</sub>-family materials via chemical vapor deposition (CVD), which is essential for advancing device applications, still remains a significant challenge since it is difficult to control the reactions among multi-precursors and form pure phases. Here, we report a controllable synthesis of high-quality magnetic topological insulator MnBi<sub>2</sub>Te<sub>4</sub> and MnBi<sub>4</sub>Te<sub>7</sub> multilayers via an evaporation-rate-controlled CVD approach. The multilayers are grown on a mica substrate epitaxially, exhibiting a regular triangle shape. By controlling growth temperatures, the thickness and lateral size of the 2D MnBi<sub>2</sub>Te<sub>4</sub> are well regulated. Furthermore, the magneto-transport measurements clearly reveal multistep spin-flop transitions for both odd- and even-number-layered MnBi<sub>2</sub>Te<sub>4</sub> multilayers. Our study marks a significant stride toward future transformative applications in devices based on high-quality, edge- and thickness-controlled 2D magnetic topological quantum materials.
Authors
- Fang Jiao (ORCID: https://orcid.org/0000-0001-5087-6228)
- Xiaotian Bao
- Hui Guo (ORCID: https://orcid.org/0000-0002-7874-7273)
- Lihong Bao (ORCID: https://orcid.org/0000-0002-2942-892X)
- Guojing Hu (ORCID: https://orcid.org/0000-0002-5527-7846)
- Guangtong Liu (ORCID: https://orcid.org/0000-0001-9436-3395)
- Zhaoyi Zhai (ORCID: https://orcid.org/0000-0002-5270-6238)
- Chenyu Bai
- Senhao Lv
- Jiadong Zhou (ORCID: https://orcid.org/0000-0001-5268-2136)
- Hong‐Jun Gao (ORCID: https://orcid.org/0000-0002-6766-0623)
- Yechao Han (ORCID: https://orcid.org/0000-0003-2679-4112)
- Hui Chen (ORCID: https://orcid.org/0000-0002-3369-8113)
- Xinfeng Liu (ORCID: https://orcid.org/0000-0002-7662-7171)
- Ke Zhu (ORCID: https://orcid.org/0000-0003-1794-1328)
- Wu Zhou (ORCID: https://orcid.org/0000-0002-0965-9915)
- Xiao Lin (ORCID: https://orcid.org/0000-0002-2490-4691)
- Jingyuan Qu
- Guoyu Xian
- Qi Qi (ORCID: https://orcid.org/0000-0002-0582-1962)
- Haitao Yang (ORCID: https://orcid.org/0000-0002-4207-4388)
Institutions
- Beijing Institute of Technology (CN)
- Chinese Academy of Sciences (CN)
- National Center for Nanoscience and Technology (CN)
- Institute of Physics (CN)
- National Laboratory for Superconductivity (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-11-28
- DOI
- https://doi.org/10.1021/acs.nanolett.4c04700
- Citations
- 8
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 2.70
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- National Key Research and Development Program of China