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
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.
收稿日期: 2020-07-17
出版日期: 2020-09-12
:
75.50.Dd
(Nonmetallic ferromagnetic materials)
75.30.Et
(Exchange and superexchange interactions)
75.50.Pp
(Magnetic semiconductors)
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2020, Vol. 37 
