Research Article


2020, 13(12): 3358–3363


Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2

Xingdan Sun1,2,§, Wanying Li1,2,§, Xiao Wang3,4,5,§, Qi Sui6,§, Tongyao Zhang7,8, Zhi Wang1,2, Long Liu1,2, Da Li1,2, Shun Feng1,2,11, Siyu Zhong9, Hanwen Wang1,2, Vincent Bouchiat10, Manuel Nunez Regueiro10, Nicolas Rougemaille10, Johann Coraux10, Anike Purbawati10, Abdellali Hadj-Azzem10, Zhenhua Wang1,2, Baojuan Dong7,8, Xing Wu9, Teng Yang1,2 (✉), Guoqiang Yu3,4,5 (✉), Bingwu Wang6 (✉), Zheng Han1,2,7 (✉), Xiufeng Han3,4,5, and Zhidong Zhang1,2

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1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
3 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
5 Songshan Lake Materials Laboratory, Dongguan 523808, China
6 Beijing National Laboratory for Molecular Sciences, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
7 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
8 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
9 Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
10 University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
11 School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
§ Xingdan Sun, Wanying Li, Xiao Wang, and Qi Sui contributed equally to this work.

Keywords: room temperature ferromagnetism, two dimensional (2D), CrTe2, anisotropic magnetoresistance (AMR)
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Although many emerging new phenomena have been unraveled in two dimensional (2D) materials with long-range spin orderings, the usually low critical temperature in van der Waals (vdW) magnetic material has thus far hindered the related practical applications. Here, we show that ferromagnetism can hold above 300 K in a metallic phase of 1T-CrTe2 down to the ultra-thin limit. It thus makes CrTe2 so far the only known exfoliated ultra-thin vdW magnets with intrinsic long-range magnetic ordering above room temperature. An in-plane room-temperature negative anisotropic magnetoresistance (AMR) was obtained in ultra-thin CrTe2 devices, with a sign change in the AMR at lower temperature, with −0.6% and +5% at 300 and 10 K, respectively. Our findings provide insights into magnetism in ultra-thin CrTe2, expanding the vdW crystals toolbox for future room-temperature spintronic applications.
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Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2. Nano Res. 2020, 13(12): 3358–3363

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