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Research Article

Near room-temperature ferromagnetism in air-stable two-dimensional Cr1−xTe grown by chemical vapor deposition

Zhansheng Gao1,§Ming Tang2,§Junwei Huang2,§Jiabiao Chen1Wei Ai1Linglu Wu2Xinyue Dong1Yifei Ma1Zheshan Zhang1Lei Zhang1Yaping Du1Huixia Fu3Hongtao Yuan2( )Jinxiong Wu1,4( )Feng Luo1( )
Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
Center of Quantum Materials and Devices & College of Physics, Chongqing University, Chongqing 401331, China
Beijing National Laboratory for Molecular Sciences, Beijing 100871, China

§ Zhansheng Gao, Ming Tang, and Junwei Huang contributed equally to this work.

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Graphical Abstract

Two-dimensional Cr1−xTe grown by chemical vapor deposition (CVD) exhibits tunable Curie temperature up to 285 K, and out-of-plane ferromagnetic order down to atomically thin limit, as evidenced by anomalous Hall effects observed in non-encapsulated samples. Moreover, the CVD-grown Cr1−xTe nanosheets present excellent ambient stability, with no apparent change in surface roughness or electrical transport properties after exposure to air for months.

Abstract

Identifying air-stable two-dimensional (2D) ferromagnetism with high Curie temperature (Tc) is highly desirable for its potential applications in next-generation spintronics. However, most of the work reported so far mainly focuses on promoting one specific key factor of 2D ferromagnetism (Tc or air stability), rather than comprehensive promotion of both of them. Herein, ultrathin Cr1–xTe crystals grown by chemical vapor deposition (CVD) show thickness-dependent Tc up to 285 K. The out-of-plane ferromagnetic order is well preserved down to atomically thin limit (2.0 nm), as evidenced by anomalous Hall effect observed in non-encapsulated samples. Besides, the CVD-grown Cr1−xTe nanosheets present excellent ambient stability, with no apparent change in surface roughness or electrical transport properties after exposure to air for months. Our work provides an alternative platform for investigation of intrinsic 2D ferromagnetism and development of innovative spintronic devices.

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Nano Research
Pages 3763-3769
Cite this article:
Gao Z, Tang M, Huang J, et al. Near room-temperature ferromagnetism in air-stable two-dimensional Cr1−xTe grown by chemical vapor deposition. Nano Research, 2022, 15(4): 3763-3769. https://doi.org/10.1007/s12274-021-3909-7
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Received: 18 August 2021
Revised: 13 September 2021
Accepted: 26 September 2021
Published: 22 October 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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