2020/09/19 by Yu Guo, Nanshu Liu, Yanyan Zhao +3
Chemistry · Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Bilayer #Chemistry #Condensed matter physics #Coupling (piping) #Covalent bond #Curie temperature #Ferromagnetism #Inorganic chemistry #Intercalation (chemistry) #MXene and MAX Phase Materials #Materials science #Membrane #Metallurgy #Molecule #Perovskite Materials and Applications #Physics #Spintronics #cond-mat.mtrl-sci #van der Waals force
paper · pdf · doi:10.1088/0256-307x/37/10/107506
arxiv created 2020/09/19 · arxiv updated 2020/09/22 · openalex created_date 2020/09/25 · openalex publication_date 2020/10/01 · openalex updated_date 2026/08/05
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.