Anomalous thickness dependence of Curie temperature in air-stable two-dimensional ferromagnetic 1T-CrTe2 grown by chemical vapor deposition

Lingjia Meng, Zhang Zhou, Mingquan Xu, Shiqi Yang, Kunpeng Si, Lixuan Liu, Xingguo Wang, Huaning Jiang, Bixuan Li, Peixin Qin, Peng Zhang, Jinliang Wang, Zhiqi Liu, Peizhe Tang, Yu Ye (), Wu Zhou (), Lihong Bao (), Hong-Jun Gao and Yongji Gong ()
Additional contact information
Lingjia Meng: Beihang University
Zhang Zhou: Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences
Mingquan Xu: University of Chinese Academy of Sciences
Shiqi Yang: Peking University
Kunpeng Si: Beihang University
Lixuan Liu: Beihang University
Xingguo Wang: Beihang University
Huaning Jiang: Beihang University
Bixuan Li: Beihang University
Peixin Qin: Beihang University
Peng Zhang: Beihang University
Jinliang Wang: Beihang University
Zhiqi Liu: Beihang University
Peizhe Tang: Beihang University
Yu Ye: Peking University
Wu Zhou: University of Chinese Academy of Sciences
Lihong Bao: Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences
Hong-Jun Gao: Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences
Yongji Gong: Beihang University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract The discovery of ferromagnetic two-dimensional van der Waals materials has opened up opportunities to explore intriguing physics and to develop innovative spintronic devices. However, controllable synthesis of these 2D ferromagnets and enhancing their stability under ambient conditions remain challenging. Here, we report chemical vapor deposition growth of air-stable 2D metallic 1T-CrTe2 ultrathin crystals with controlled thickness. Their long-range ferromagnetic ordering is confirmed by a robust anomalous Hall effect, which has seldom been observed in other layered 2D materials grown by chemical vapor deposition. With reducing the thickness of 1T-CrTe2 from tens of nanometers to several nanometers, the easy axis changes from in-plane to out-of-plane. Monotonic increase of Curie temperature with the thickness decreasing from ~130.0 to ~7.6 nm is observed. Theoretical calculations indicate that the weakening of the Coulomb screening in the two-dimensional limit plays a crucial role in the change of magnetic properties.

Date: 2021
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DOI: 10.1038/s41467-021-21072-z

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