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Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films
DOI:
10.1038/s41467-021-22777-x
Authors:
Xiaoqian
Zhang
(Nanjing University; University of Missouri)
,
Qiangsheng
Lu
(University of Missouri)
,
Wenqing
Liu
(Nanjing University; Royal Holloway University of London)
,
Wei
Niu
(Nanjing University of Posts and Telecommunications)
,
Jiabao
Sun
(Royal Holloway University of London)
,
Jacob
Cook
(University of Missouri)
,
Mitchel
Vaninger
(University of Missouri)
,
Paul F.
Miceli
(University of Missouri)
,
David J.
Singh
(University of Missouri)
,
Shang-Wei
Lian
(National Cheng Kung University)
,
Tay-Rong
Chang
(National Cheng Kung University; Center for Quantum Frontiers of Research and Technology (QFort))
,
Xiaoqing
He
(University of Missouri)
,
Jun
Du
(Nanjing University)
,
Liang
He
(Nanjing University)
,
Rong
Zhang
(Nanjing University)
,
Guang
Bian
(University of Missouri)
,
Yongbing
Xu
(Nanjing University; The University of York)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Nature Communications
, VOL 12
State:
Published (Approved)
Published:
May 2021
Diamond Proposal Number(s):
22532

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 μ B /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.
Journal Keywords: Magnetic properties and materials; Two-dimensional materials
Diamond Keywords: Spintronics; Ferromagnetism
Subject Areas:
Materials,
Physics
Instruments:
I10-Beamline for Advanced Dichroism
Added On:
10/05/2021 13:18
Documents:
s41467-021-22777-x.pdf
Discipline Tags:
Surfaces
Quantum Materials
Hard condensed matter - electronic properties
Physics
Electronics
Magnetism
Materials Science
interfaces and thin films
Technical Tags:
Spectroscopy
Circular Dichroism (CD)
X-ray Absorption Spectroscopy (XAS)
X-ray Magnetic Circular Dichroism (XMCD)