Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films
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 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 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.
- Authors:
-
[5];
[2];
[7];
[9];
[9];
[2];
[9]
- Nanjing Univ. (China). Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials; Univ. of Missouri, Columbia, MO (United States)
- 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
- Publication Date:
- Research Org.:
- Univ. of Missouri, Columbia, MO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Key Research and Development Program of China; National Basic Research Program of China; National Natural Science Foundation of China (NSFC); Jiangsu Shuangchuang Program; Natural Science Foundation of Jiangsu Province of China; Natural Science Foundation of the Jiangsu Higher Education Institutions of China; leverhulme Trust; Royal Society; Ministry of Science and Technology (MOST), Taiwan; National Center for Theoretical Sciences, Taiwan; Ministry of Education to the Headquarters of University Advancement at National Cheng Kung University (NCKU)
- OSTI Identifier:
- 1780912
- Grant/Contract Number:
- SC0019114; MOST107-2627-E-006-001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; Magnetism
Citation Formats
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, and Xu, Yongbing. Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films. United States: N. p., 2021.
Web. doi:10.1038/s41467-021-22777-x.
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. Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films. United States. https://doi.org/10.1038/s41467-021-22777-x
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, and Xu, Yongbing. Mon .
"Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films". United States. https://doi.org/10.1038/s41467-021-22777-x. https://www.osti.gov/servlets/purl/1780912.
@article{osti_1780912,
title = {Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films},
author = {Zhang, Xiaoqian and Lu, Qiangsheng and Liu, Wenqing and Niu, Wei and Sun, Jiabao and Cook, Jacob and Vaninger, Mitchel and Miceli, Paul F. and Singh, David J. and Lian, Shang-Wei and Chang, Tay-Rong and He, Xiaoqing and Du, Jun and He, Liang and Zhang, Rong and Bian, Guang and Xu, Yongbing},
abstractNote = {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 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.},
doi = {10.1038/s41467-021-22777-x},
journal = {Nature Communications},
number = 1,
volume = 12,
place = {United States},
year = {Mon May 03 00:00:00 EDT 2021},
month = {Mon May 03 00:00:00 EDT 2021}
}
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