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:
-
- 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}
}
Works referenced in this record:
Massless Dirac Fermions in ZrTe 2 Semimetal Grown on InAs(111) by van der Waals Epitaxy
journal, January 2018
- Tsipas, Polychronis; Tsoutsou, Dimitra; Fragkos, Sotirios
- ACS Nano, Vol. 12, Issue 2
Experimental Confirmation of the X-Ray Magnetic Circular Dichroism Sum Rules for Iron and Cobalt
journal, July 1995
- Chen, C. T.; Idzerda, Y. U.; Lin, H. -J.
- Physical Review Letters, Vol. 75, Issue 1
Enhancing Magnetic Ordering in Cr-Doped Bi 2 Se 3 Using High- T C Ferrimagnetic Insulator
journal, December 2014
- Liu, Wenqing; He, Liang; Xu, Yongbing
- Nano Letters, Vol. 15, Issue 1
Electronic structure of ferromagnetic semiconductor by angle-resolved photoemission spectroscopy
journal, September 2018
- Li, Y. F.; Wang, W.; Guo, W.
- Physical Review B, Vol. 98, Issue 12
Evidence of the Existence of Magnetism in Pristine VX 2 Monolayers (X = S, Se) and Their Strain-Induced Tunable Magnetic Properties
journal, January 2012
- Ma, Yandong; Dai, Ying; Guo, Meng
- ACS Nano, Vol. 6, Issue 2
Structural and magnetic properties of hexagonal Cr1Te films grown on CdTe(001) by molecular beam epitaxy
journal, April 2015
- Kanazawa, Ken; Yamawaki, Kazuma; Sekita, Naoya
- Journal of Crystal Growth, Vol. 415
Two-dimensional itinerant ferromagnetism in atomically thin Fe3GeTe2
journal, August 2018
- Fei, Zaiyao; Huang, Bevin; Malinowski, Paul
- Nature Materials, Vol. 17, Issue 9
Observation of unconventional anomalous Hall effect in epitaxial CrTe thin films
journal, May 2018
- Zhao, Dapeng; Zhang, Liguo; Malik, Iftikhar Ahmed
- Nano Research, Vol. 11, Issue 6
A perpendicular-anisotropy CoFeB–MgO magnetic tunnel junction
journal, July 2010
- Ikeda, S.; Miura, K.; Yamamoto, H.
- Nature Materials, Vol. 9, Issue 9
Ferromagnetic insulator Cr 2 Ge 2 Te 6 thin films with perpendicular remanence
journal, September 2018
- Mogi, M.; Tsukazaki, A.; Kaneko, Y.
- APL Materials, Vol. 6, Issue 9
Temperature-dependent magnetic anisotropy in the layered magnetic semiconductors and
journal, February 2018
- Richter, Nils; Weber, Daniel; Martin, Franziska
- Physical Review Materials, Vol. 2, Issue 2
Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2
journal, August 2020
- Sun, Xingdan; Li, Wanying; Wang, Xiao
- Nano Research, Vol. 13, Issue 12
Perpendicular magnetic anisotropy at transition metal/oxide interfaces and applications
journal, June 2017
- Dieny, B.; Chshiev, M.
- Reviews of Modern Physics, Vol. 89, Issue 2
Ultrathin Co/Pt and Co/Pd superlattice films for MgO-based perpendicular magnetic tunnel junctions
journal, December 2010
- Yakushiji, K.; Saruya, T.; Kubota, H.
- Applied Physics Letters, Vol. 97, Issue 23
Interfacial Rashba-Effect-Induced Anisotropy in Nonmagnetic-Material–Ferrimagnetic-Insulator Bilayers
journal, June 2020
- Lee, Aidan J.; Ahmed, Adam S.; McCullian, Brendan A.
- Physical Review Letters, Vol. 124, Issue 25
Tailoring magnetism in self-intercalated epitaxial films
journal, November 2020
- Fujisawa, Y.; Pardo-Almanza, M.; Garland, J.
- Physical Review Materials, Vol. 4, Issue 11
Strong room-temperature ferromagnetism in VSe2 monolayers on van der Waals substrates
journal, February 2018
- Bonilla, Manuel; Kolekar, Sadhu; Ma, Yujing
- Nature Nanotechnology, Vol. 13, Issue 4
Carrier-mediated ferromagnetism in the magnetic topological insulator Cr-doped (Sb,Bi)2Te3
journal, November 2015
- Ye, Mao; Li, Wei; Zhu, Siyuan
- Nature Communications, Vol. 6, Issue 1
Electric-field control of magnetism in a few-layered van der Waals ferromagnetic semiconductor
journal, July 2018
- Wang, Zhi; Zhang, Tongyao; Ding, Mei
- Nature Nanotechnology, Vol. 13, Issue 7
Magnetic structure and phase stability of the van der Waals bonded ferromagnet
journal, January 2016
- May, Andrew F.; Calder, Stuart; Cantoni, Claudia
- Physical Review B, Vol. 93, Issue 1
In-Plane Magnetic Domains and Néel-like Domain Walls in Thin Flakes of the Room Temperature CrTe 2 Van der Waals Ferromagnet
journal, June 2020
- Purbawati, Anike; Coraux, Johann; Vogel, Jan
- ACS Applied Materials & Interfaces, Vol. 12, Issue 27
Evidence for Magnetic Skyrmions at the Interface of Ferromagnet/Topological-Insulator Heterostructures
journal, August 2019
- Chen, Junshu; Wang, Linjing; Zhang, Meng
- Nano Letters, Vol. 19, Issue 9
Atomic-Scale Interfacial Magnetism in Fe/Graphene Heterojunction
journal, July 2015
- Liu, W. Q.; Wang, W. Y.; Wang, J. J.
- Scientific Reports, Vol. 5, Issue 1
Van der Waals engineering of ferromagnetic semiconductor heterostructures for spin and valleytronics
journal, May 2017
- Zhong, Ding; Seyler, Kyle L.; Linpeng, Xiayu
- Science Advances, Vol. 3, Issue 5
Tailoring exchange couplings in magnetic topological-insulator/antiferromagnet heterostructures
journal, October 2016
- He, Qing Lin; Kou, Xufeng; Grutter, Alexander J.
- Nature Materials, Vol. 16, Issue 1
Giant perpendicular magnetic anisotropy in Ir/Co/Pt multilayers
journal, October 2019
- Lau, Yong-Chang; Chi, Zhendong; Taniguchi, Tomohiro
- Physical Review Materials, Vol. 3, Issue 10
Ligand-field helical luminescence in a 2D ferromagnetic insulator
journal, December 2017
- Seyler, Kyle L.; Zhong, Ding; Klein, Dahlia R.
- Nature Physics, Vol. 14, Issue 3
Optimization of out-of-plane magnetized Co/Pt multilayers with resistive buffer layers
journal, August 2011
- Emori, Satoru; Beach, Geoffrey S. D.
- Journal of Applied Physics, Vol. 110, Issue 3
Perpendicular Magnetic Anisotropy and Spin Glass-like Behavior in Molecular Beam Epitaxy Grown Chromium Telluride Thin Films
journal, February 2015
- Roy, Anupam; Guchhait, Samaresh; Dey, Rik
- ACS Nano, Vol. 9, Issue 4
A new (2 × 1) dimerized structure of monolayer 1T-molybdenum disulfide, studied from first principles calculations
journal, November 2013
- Hu, Ting; Li, Rui; Dong, Jinming
- The Journal of Chemical Physics, Vol. 139, Issue 17
Atomic-Scale Magnetism of Cr-Doped Bi 2 Se 3 Thin Film Topological Insulators
journal, September 2015
- Liu, Wenqing; West, Damien; He, Liang
- ACS Nano, Vol. 9, Issue 10
Strong magnetic x-ray dichroism in 2 p absorption spectra of 3 d transition-metal ions
journal, June 1991
- van der Laan, G.; Thole, B. T.
- Physical Review B, Vol. 43, Issue 16
Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy
journal, September 2017
- Liu, Shanshan; Yuan, Xiang; Zou, Yichao
- npj 2D Materials and Applications, Vol. 1, Issue 1
Antiferromagnetism and ferromagnetism in layered -CrSe with V and Ti replacements
journal, January 2013
- Freitas, Daniele C.; Núñez, Matías; Strobel, Pierre
- Physical Review B, Vol. 87, Issue 1
Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals
journal, April 2017
- Gong, Cheng; Li, Lin; Li, Zhenglu
- Nature, Vol. 546, Issue 7657
Electric-field switching of two-dimensional van der Waals magnets
journal, March 2018
- Jiang, Shengwei; Shan, Jie; Mak, Kin Fai
- Nature Materials, Vol. 17, Issue 5
Gate-tunable room-temperature ferromagnetism in two-dimensional Fe3GeTe2
journal, October 2018
- Deng, Yujun; Yu, Yijun; Song, Yichen
- Nature, Vol. 563, Issue 7729
Calculating the spontaneous magnetization and defining the Curie temperature using a positive-feedback model
journal, January 2014
- Harrison, R. G.
- Journal of Applied Physics, Vol. 115, Issue 3
Evidence of Spin Frustration in a Vanadium Diselenide Monolayer Magnet
journal, April 2019
- Wong, Ping Kwan Johnny; Zhang, Wen; Bussolotti, Fabio
- Advanced Materials, Vol. 31, Issue 23
Controlled Two-Dimensional Ferromagnetism in 1T–CrTe 2 : The Role of Charge Density Wave and Strain
journal, August 2020
- Otero Fumega, Adolfo; Phillips, Jan; Pardo, Victor
- The Journal of Physical Chemistry C, Vol. 124, Issue 38
Evidence of charge density wave with anisotropic gap in a monolayer film
journal, December 2019
- Wang, Yuan; Ren, Junhai; Li, Jiaheng
- Physical Review B, Vol. 100, Issue 24
Epitaxial Mn2.5Ga thin films with giant perpendicular magnetic anisotropy for spintronic devices
journal, March 2009
- Wu, Feng; Mizukami, Shigemi; Watanabe, Daisuke
- Applied Physics Letters, Vol. 94, Issue 12
Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit
journal, June 2017
- Huang, Bevin; Clark, Genevieve; Navarro-Moratalla, Efrén
- Nature, Vol. 546, Issue 7657
Valence values of the cations in selenospinel Cu(Cr,Ti) 2 Se 4
journal, March 2007
- Noh, H. -J; Kang, J. -S; Lee, S. S.
- Europhysics Letters (EPL), Vol. 78, Issue 2
Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
journal, September 2019
- Belopolski, Ilya; Manna, Kaustuv; Sanchez, Daniel S.
- Science, Vol. 365, Issue 6459
Long range intrinsic ferromagnetism in two dimensional materials and dissipationless future technologies
journal, December 2018
- Shabbir, Babar; Nadeem, Muhammad; Dai, Zhigao
- Applied Physics Reviews, Vol. 5, Issue 4
Magnetic anisotropy and topological Hall effect in the trigonal chromium tellurides Cr 5 Te 8
journal, July 2019
- Wang, Yihao; Yan, Jian; Li, Junbo
- Physical Review B, Vol. 100, Issue 2
Molecular beam epitaxy of thin HfTe 2 semimetal films
journal, October 2016
- Aminalragia-Giamini, S.; Marquez-Velasco, J.; Tsipas, P.
- 2D Materials, Vol. 4, Issue 1
Ab initio investigation of structural stability and exfoliation energies in transition metal dichalcogenides based on Ti-, V-, and Mo-group elements
journal, April 2019
- Bastos, Carlos M. O.; Besse, Rafael; Da Silva, Juarez L. F.
- Physical Review Materials, Vol. 3, Issue 4
Magnetic 2D materials and heterostructures
journal, May 2019
- Gibertini, M.; Koperski, M.; Morpurgo, A. F.
- Nature Nanotechnology, Vol. 14, Issue 5
Giant tunneling magnetoresistance in spin-filter van der Waals heterostructures
journal, May 2018
- Song, Tiancheng; Cai, Xinghan; Tu, Matisse Wei-Yuan
- Science, Vol. 360, Issue 6394
Anomalous Hall effect in the trigonal Cr 5 Te 8 single crystal
journal, November 2018
- Liu, Yu; Petrovic, C.
- Physical Review B, Vol. 98, Issue 19
On the origin of magnetic anisotropy in two dimensional CrI 3
journal, June 2017
- Lado, J. L.; Fernández-Rossier, J.
- 2D Materials, Vol. 4, Issue 3
Experimental observation of dual magnetic states in topological insulators
journal, February 2019
- Liu, Wenqing; Xu, Yongbing; He, Liang
- Science Advances, Vol. 5, Issue 2
Electronic Structure and Enhanced Charge-Density Wave Order of Monolayer VSe 2
journal, June 2018
- Feng, Jiagui; Biswas, Deepnarayan; Rajan, Akhil
- Nano Letters, Vol. 18, Issue 7
Hard magnetic properties in nanoflake van der Waals Fe3GeTe2
journal, April 2018
- Tan, Cheng; Lee, Jinhwan; Jung, Soon-Gil
- Nature Communications, Vol. 9, Issue 1