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Vapor Deposition of Magnetic Van der Waals NiI2 Crystals.

Authors
  • Liu, Haining1, 2, 3
  • Wang, Xinsheng1
  • Wu, Juanxia1
  • Chen, Yuansha4
  • Wan, Jing5
  • Wen, Rui5
  • Yang, Jinbo6
  • Liu, Ying1
  • Song, Zhigang6
  • Xie, Liming1, 2
  • 1 CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China. , (China)
  • 2 University of Chinese Academy of Sciences, Beijing 100049, China. , (China)
  • 3 College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China. , (China)
  • 4 Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. , (China)
  • 5 Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. , (China)
  • 6 State Key Laboratory for Mesoscopic Physics and School of Physics, Peking University, Beijing 100871, China. , (China)
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
Aug 25, 2020
Volume
14
Issue
8
Pages
10544–10551
Identifiers
DOI: 10.1021/acsnano.0c04499
PMID: 32806048
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The recent discovery of van der Waals magnetic materials has attracted great attention in materials science and spintronics. The preparation of ultrathin magnetic layers down to atomic thickness is challenging and is mostly by mechanical exfoliation. Here, we report vapor deposition of magnetic van der Waals NiI2 crystals. Two-dimensional (2D) NiI2 flakes are grown on SiO2/Si substrates with a thickness of 5-40 nm and on hexagonal boron nitride (h-BN) down to monolayer thickness. Temperature-dependent Raman spectroscopy reveals robust magnetic phase transitions in the as-grown 2D NiI2 crystals down to trilayer. Electrical measurements show a semiconducting transport behavior with a high on/off ratio of 106 for the NiI2 flakes. Lastly, density functional theory calculation shows an intralayer ferromagnetic and interlayer antiferromagnetic ordering in 2D NiI2. This work provides a feasible approach to epitaxy 2D magnetic transition metal halides and also offers atomically thin materials for spintronic devices.

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