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Nano Research

Article Title

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

Authors

Xingdan Sun, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Wanying Li, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Xiao Wang, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;Songshan Lake Materials Laboratory, Dongguan 523808, China
Qi Sui, 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
Tongyao Zhang, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China;State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
Zhi Wang, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Long Liu, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Da Li, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Shun Feng, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China;School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
Siyu Zhong, Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
Hanwen Wang, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Vincent Bouchiat, University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
Manuel Nunez Regueiro, University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
Nicolas Rougemaille, University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
Johann Coraux, University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
Anike Purbawati, University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
Abdellali Hadj-Azzem, University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
Zhenhua Wang, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Baojuan Dong, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China;State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
Xing Wu, Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
Teng Yang, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Guoqiang Yu, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;Songshan Lake Materials Laboratory, Dongguan 523808, China
Bingwu Wang, 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
Zheng Han, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China;Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Xiufeng Han, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;Songshan Lake Materials Laboratory, Dongguan 523808, China

Keywords

room temperature ferromagnetism, two dimensional (2D), CrTe2, anisotropic magnetoresistance (AMR)

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.

Publisher

Tsinghua University Press

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