Spin-related electronics using two dimensional (2D) van der Waals (vdW) materials as a platform are believed to hold great promise for revolutionizing the next generation spintronics. Although many emerging new phenomena have been unravelled in 2D electronic systems with spin long-range orderings, the scarcely reported room temperature magnetic vdW material has thus far hindered the related applications. Here, we show that intrinsic ferromagnetically aligned spin polarization can hold up to 316 K in a metallic phase of 1T-CrTe2 in the few-layer limit. This room temperature 2D long range spin interaction may be beneficial from an itinerant enhancement. Spin transport measurements indicate an in-plane room temperature negative anisotropic magnetoresistance (AMR) in few-layered CrTe2, but a sign change in the AMR at lower temperature, with -0.6% at 300 K and +5% at 10 K, respectively. This behavior may originate from the specific spin polarized band structure of CrTe2. Our findings provide insights into magnetism in few-layered CrTe2, suggesting potential for future room temperature spintronic applications of such 2D vdW magnets.
@article{arxiv.1909.09797,
title = {Room temperature 2D ferromagnetism in few-layered 1$T$-CrTe$_{2}$},
author = {Xingdan Sun and Wanying Li and Xiao Wang and Qi Sui and Tongyao Zhang and Zhi Wang and Long Liu and Da Li and Shun Feng and Siyu Zhong and Hanwen Wang and Vincent Bouchiat and Manuel Nunez Regueiro and Nicolas Rougemaille and Johann Coraux and Zhenhua Wang and Baojuan Dong and Xing Wu and Teng Yang and Guoqiang Yu and Bingwu Wang and Zheng Vitto Han and Xiufeng Han and Zhidong Zhang},
journal= {arXiv preprint arXiv:1909.09797},
year = {2020}
}