CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Enhanced Ferromagnetism of CrI$_{3}$ Bilayer by Self-Intercalation |
Yu Guo , Nanshu Liu , Yanyan Zhao , Xue Jiang , Si Zhou*, and Jijun Zhao |
MOE Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, China |
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Cite this article: |
Yu Guo , Nanshu Liu , Yanyan Zhao et al 2020 Chin. Phys. Lett. 37 107506 |
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Abstract Two-dimensional (2D) ferromagnets with high Curie temperature have long been the pursuit for electronic and spintronic applications. CrI$_{3}$ is a rising star of intrinsic 2D ferromagnets, however, it suffers from weak exchange coupling. Here we propose a general strategy of self-intercalation to achieve enhanced ferromagnetism in bilayer CrI$_{3}$. We show that filling either Cr or I atoms into the van der Waals gap of stacked and twisted CrI$_{3}$ bilayers can induce the double exchange effect and significantly strengthen the interlayer ferromagnetic coupling. According to our first-principles calculations, the intercalated native atoms act as covalent bridge between two CrI$_{3}$ layers and lead to discrepant oxidation states for the Cr atoms. These theoretical results offer a facile route to achieve high-Curie-temperature 2D magnets for device implementation.
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Received: 17 July 2020
Published: 12 September 2020
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PACS: |
75.50.Dd
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(Nonmetallic ferromagnetic materials)
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75.30.Et
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(Exchange and superexchange interactions)
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75.50.Pp
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(Magnetic semiconductors)
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Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11974068 and 11874097), the China Postdoctoral Science Foundation (Grant Nos. BX20190052 and 2020M670739), and the Fundamental Research Funds for the Central Universities of China (Grant Nos. DUT20LAB110 and DUT19LK12). The authors acknowledge the computer resources provided by the Supercomputing Center of Dalian University of Technology and Shanghai Supercomputer Center. |
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