Journal
NANO RESEARCH
Volume 13, Issue 12, Pages 3358-3363Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-3021-4
Keywords
room temperature ferromagnetism; two dimensional (2D); CrTe2; anisotropic magnetoresistance (AMR)
Categories
Funding
- National Key R&D Program of China [2019YFA0307800, 2017YFA0206302, 2017YFA0206200]
- National Natural Science Foundation of China (NSFC) [11974357, U1932151, 51627801, 11874409, 61574060, 8206300210]
- Major Program of Aerospace Advanced Manufacturing Technology Research Foundation NSFC [U1537204]
- CASC, China [U1537204]
- State Key Laboratory of Quantum Optics and Quantum Optics Devices [KF201816]
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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-CrTe(2)down to the ultra-thin limit. It thus makes CrTe(2)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 CrTe(2)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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