期刊
NANO LETTERS
卷 18, 期 5, 页码 2943-2949出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b00314
关键词
Metal trihalides; monolayer CrI3; two-dimensional materials; ferromagnetism; switchable electric polarization; out-of-plane polarization
类别
资金
- National Key Research and Development Program of China [2017YFA0204800]
- Natural Science Foundation of China [21525311, 21773027, 11674055]
- Jiangsu 333 project [BRA2016353]
- Fundamental Research Funds for the Central Universities of China
- Scientific Research Foundation of Graduate School of Southeast University [1113111669]
Monolayer chromium triiodide (CrI3), as the thinnest ferromagnetic material demonstrated in experiment [Huang et al. Nature 2017, 546, 270], opens up new opportunities for the application of two-dimensional (2D) materials in spintronic nanodevices. Atom-thick 2D materials with switchable electric polarization are now urgently needed for their rarity and important roles in nanoelectronics. Herein, we unveil that surface I vacancies not only enhance the intrinsic ferromagnetism of monolayer CrI3 but also induce switchable electric polarization. I vacancies bring about an out-of-plane polarization without breaking the nonmetallic nature of CrI3. Meanwhile, the induced polarization can be reversed in a moderate energy barrier, arising from the unique porosity of CrI3 that contributes to the switch of I vacancies between top and bottom surfaces. Engineering 2D switchable polarization through surface vacancies is also applicable to many other metal trihalides, which opens up a new and general way toward pursuing low-dimensional multifunctional nanodevices.
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