Author(s): Wen, Y (Wen, Yao); Liu, ZH (Liu, Zhehong); Zhang, Y (Zhang, Yu); Xia, CX (Xia, Congxin); Zhai, BX (Zhai, Baoxing); Zhang, XH (Zhang, Xinhui); Zhai, GH (Zhai, Guihao); Shen, C (Shen, Chao); He, P (He, Peng); Cheng, RQ (Cheng, Ruiqing); Yin, L (Yin, Lei); Yao, YY (Yao, Yuyu); Sendeku, MG (Sendeku, Marshet Getaye); Wang, ZX (Wang, Zhenxing); Ye, XB (Ye, Xubing); Liu, CS (Liu, Chuansheng); Jiang, C (Jiang, Chao); Shan, CX (Shan, Chongxin); Long, YW (Long, Youwen); He, J (He, Jun)

Source: NANO LETTERS Volume: 20 Issue: 5 Pages: 3130-3139 DOI: 10.1021/acs.nanolett.9b05128 Published: MAY 13 2020

Abstract: The manipulation of magnetism provides a unique opportunity for the development of data storage and spintronic applications. Until now, electrical control, pressure tuning, stacking structure dependence, and nanoscale engineering have been realized. However, as the dimensions are decreased, the decrease of the ferromagnetism phase transition temperature (T-c) is a universal trend in ferromagnets. Here, we make a breakthrough to realize the synthesis of 1 and 2 unit cell (UC) Cr2Te3 and discover a room-temperature ferromagnetism in two-dimensional Cr2Te3. The newly observed T-c increases strongly from 160 K in the thick flake (40.3 nm) to 280 K in 6 UC Cr2Te3 (7.1 nm). The magnetization and anomalous Hall effect measurements provided unambiguous evidence for the existence of spontaneous magnetization at room temperature. The theoretical model revealed that the reconstruction of Cr2Te3 could result in anomalous thickness-dependent T-c. This dimension tuning method opens up a new avenue for manipulation of ferromagnetism.

Accession Number: WOS:000535255300025

PubMed ID: 32338924

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Shen, Chao         J-1406-2017         0000-0002-3664-4874

ISSN: 1530-6984

eISSN: 1530-6992

Full Text: https://pubs.acs.org/doi/10.1021/acs.nanolett.9b05128