Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films

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

doi:10.1038/s41467-021-22777-x

Room-temperature intrinsic ferromagnetism in epitaxial CrTe₂ ultrathin films

Journal Article · Mon May 03 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-22777-x· OSTI ID:1780912

Zhang, Xiaoqian ^[1]; Lu, Qiangsheng ^[2]; Liu, Wenqing ^[3]; Niu, Wei ^[4]; ^[5]; Cook, Jacob ^[2]; Vaninger, Mitchel ^[2]; Miceli, Paul F. ^[2]; ^[2]; Lian, Shang-Wei ^[6]; ^[7]; He, Xiaoqing ^[2]; Du, Jun ^[8]; ^[9]; ^[9]; ^[2]; ^[9]

Nanjing Univ. (China). Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials; Univ. of Missouri, Columbia, MO (United States); University of Missouri
Univ. of Missouri, Columbia, MO (United States)
Nanjing Univ. (China). Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials; Royal Holloway University of London, Egham, Surrey (London)
Nanjing Univ. (China). New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science
Royal Holloway University of London, Egham, Surrey (London)
National Cheng Kung Univ., Tainan City (Taiwan)
National Cheng Kung Univ., Tainan City (Taiwan); Center for Quantum Frontiers of Research and Technology (QFort), Tainan (Taiwan)
Nanjing Univ. (China). National Laboratory of Solid State Microstructures
Nanjing Univ. (China). Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials

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 in this paper, 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 μ_B/Cr and perpendicular magnetic anisotropy (PMA) constant (K_u) 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 (T_C ~ 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Missouri, Columbia, MO (United States)

Sponsoring Organization:: Jiangsu Shuangchuang Program; Ministry of Education to the Headquarters of University Advancement at National Cheng Kung University (NCKU); Ministry of Science and Technology (MOST), Taiwan; National Basic Research Program of China; National Center for Theoretical Sciences, Taiwan; National Key Research and Development Program of China; National Natural Science Foundation of China (NNSFC); Natural Science Foundation of Jiangsu Province of China; Natural Science Foundation of the Jiangsu Higher Education Institutions of China; Royal Society; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; leverhulme Trust

Grant/Contract Number:: SC0019114

OSTI ID:: 1780912

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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