Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2
room temperature ferromagnetism, two dimensional (2D), CrTe2, anisotropic magnetoresistance (AMR)
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.
Tsinghua University Press
Xingdan Sun, Wanying Li, Xiao Wang, Qi Sui, Tongyao Zhang, Zhi Wang, Long Liu, Da Li, Shun Feng, Siyu Zhong, Hanwen Wang, Vincent Bouchiat, Manuel Nunez Regueiro, Nicolas Rougemaille, Johann Coraux, Anike Purbawati, Abdellali Hadj-Azzem, Zhenhua Wang, Baojuan Dong, Xing Wu, Teng Yang, Guoqiang Yu, Bingwu Wang, Zheng Han, Xiufeng Han, Zhidong Zhang. Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2. Nano Research 2020, 13(12): 3358-3363.