Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films. / Zhang, Xiaoqian; Lu, Qiangsheng ; Liu, Wenqing; Niu, Wei; Sun, Jiabao; Cook, Jacob; Vaninger, Mitchel; F. Miceli, Paul; J. Singh, David; Lian, Shang-Wei; Chang, Tay-Rong; He, Xiaoqing; Du, Jun; He, Liang; Zhang, Rong; Bian, Guang; Xu, Yongbing.

In: Nature Communications, Vol. 12, 2492, 03.05.2021, p. 1-9.

Research output: Contribution to journalArticlepeer-review

Published
  • Xiaoqian Zhang
  • Qiangsheng Lu
  • Wenqing Liu
  • Wei Niu
  • Jiabao Sun
  • Jacob Cook
  • Mitchel Vaninger
  • Paul F. Miceli
  • David J. Singh
  • Shang-Wei Lian
  • Tay-Rong Chang
  • Xiaoqing He
  • Jun Du
  • Liang He
  • Rong Zhang
  • Guang Bian
  • Yongbing Xu

Abstract

While the discovery of two-dimensional (2D) magnets opens the door for fundamental physics and next-generation spintronics, it is technically challenging to achieve the room-temperature ferromagnetic (FM) order in a way compatible with potential device applications. Here, we report the growth and properties of single- and few-layer CrTe2, a van der Waals (vdW) material, on bilayer graphene by molecular beam epitaxy (MBE). Intrinsic ferromagnetism with a Curie temperature (TC) up to 300 K, an atomic magnetic moment of ~0.21 μB/Cr and perpendicular magnetic anisotropy (PMA) constant (Ku) of 4.89 × 105 erg/cm3 at room temperature in these few-monolayer films have been unambiguously evidenced by superconducting quantum interference device and X-ray magnetic circular dichroism. This intrinsic ferromagnetism has also been identified by the splitting of majority and minority band dispersions with ~0.2 eV at Г point using angle-resolved photoemission spectroscopy. The FM order is preserved with the film thickness down to a monolayer (TC ~ 200 K), benefiting from the strong PMA and weak interlayer coupling. The successful MBE growth of 2D FM CrTe2 films with room-temperature ferromagnetism opens a new avenue for developing large-scale 2D magnet-based spintronics devices.
Original languageEnglish
Article number2492
Pages (from-to)1-9
Number of pages9
JournalNature Communications
Volume12
DOIs
Publication statusPublished - 3 May 2021
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

ID: 42770256