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

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Abstract

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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Acknowledgements

This work is supported by the National Key R&D Program of China (Nos. 2019YFA0307800, 2017YFA0206302, and 2017YFA0206200) and the National Natural Science Foundation of China (NSFC) (Nos. 11974357, U1932151, and 51627801). G. Y. and X. H. thank the financial supports from the National Natural Science Foundation of China (NSFC) (No. 11874409). This work is supported by the National Natural Science Foundation of China (NSFC) (Nos. 61574060, and 8206300210). T. Y. acknowledges supports from the Major Program of Aerospace Advanced Manufacturing Technology Research Foundation NSFC and CASC, China (No. U1537204). Z. H. acknowledges the support from the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices (No. KF201816). The authors appreciate the help of Dr. Binbin Jiang in obtaining the HAADF-STEM images.

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  1. Xingdan Sun, Wanying Li, Xiao Wang, and Qi Sui contributed equally to this work.

Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Xingdan Sun, Wanying Li, Zhi Wang, Long Liu, Da Li, Shun Feng, Hanwen Wang, Zhenhua Wang, Teng Yang, Zheng Han & Zhidong Zhang

  2. School of Material Science and Engineering, University of Science and Technology of China, Hefei, 230026, China

    Xingdan Sun, Wanying Li, Zhi Wang, Long Liu, Da Li, Shun Feng, Hanwen Wang, Zhenhua Wang, Teng Yang, Zheng Han & Zhidong Zhang

  3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Xiao Wang, Guoqiang Yu & Xiufeng Han

  4. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Xiao Wang, Guoqiang Yu & Xiufeng Han

  5. Songshan Lake Materials Laboratory, Dongguan, 523808, China

    Xiao Wang, Guoqiang Yu & Xiufeng Han

  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

    Qi Sui & Bingwu Wang

  7. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China

    Tongyao Zhang, Baojuan Dong & Zheng Han

  8. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, China

    Tongyao Zhang & Baojuan Dong

  9. Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, China

    Siyu Zhong & Xing Wu

  10. Institut Néel, University Grenoble Alpes, CNRS, Grenoble INP, F-38000, Grenoble, France

    Vincent Bouchiat, Manuel Nunez Regueiro, Nicolas Rougemaille, Johann Coraux, Anike Purbawati & Abdellali Hadj-Azzem

  11. School of Physical Science and Technology, ShanghaiTech University, Shanghai, 200031, China

    Shun Feng

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  1. Xingdan Sun
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Correspondence to Teng Yang, Guoqiang Yu, Bingwu Wang or Zheng Han.

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Sun, X., Li, W., Wang, X. et al. Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2. Nano Res. 13, 3358–3363 (2020). https://doi.org/10.1007/s12274-020-3021-4

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