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Nano Research 2020, 13(12): 3358-3363 https://doi.org/10.1007/s12274-020-3021-4
Research Article | Issue | Published: 29 August 2020

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

Show Author's Information 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,  Zhidong Zhang1,2
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
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
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
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
Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
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)
Topics:
Chromium compoundsCrystalsFerromagnetismMagnetic materials Van der Waals forces
Cite this article:
Sun X, Li W, Wang X, et al. Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2. Nano Research, 2020, 13(12): 3358-3363. https://doi.org/10.1007/s12274-020-3021-4
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Abstract Full text Electronic supplementary material About this article

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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Abstract
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Electronic supplementary material
About this article

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

Show Author's information 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, Zhidong Zhang1,2
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
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
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
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
Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, France
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.

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.

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

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Publication history
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Acknowledgements

Publication history

Received: 08 June 2020
Revised: 04 July 2020
Accepted: 29 July 2020
Published: 29 August 2020
Issue date: December 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

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. Q. Y. and X. F. 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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