Enhanced Ferromagnetism of CrI3 Bilayer by Self-Intercalation

Abstract

Two-dimensional (2D) ferromagnets with high Curie temperature have long been the pursuit for electronic and spintronic applications. CrI3 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 CrI3. We showed that filling either Cr or I atoms into the van der Waals gap of stacked and twisted CrI3 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 CrI3 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.

References in corpus (18)

• Van der Waals heterostructures
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Enhanced Catalytic Activity in Strained Chemically Exfoliated WS2 Nanosheets for Hydrogen Evolution
• Electrical Control of 2D Magnetism in Bilayer CrI3
• Giant Tunneling Magnetoresistance in Spin-Filter van der Waals Heterostructures
• Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling
• Stacking-Dependent Magnetism in Bilayer CrI${}_3$
• Strange metal in magic-angle graphene with near Planckian dissipation
• Approaching the Limits of Transparency and Conductivity in Graphitic Materials through Lithium Intercalation
• Direct Observation of Superconductivity in Calcium-Intercalated Bilayer Graphene by in situ Electrical Transport Measurements
• Strain-induced Evolution of Electronic Band Structures in a Twisted Graphene Bilayer
• Coexistence of Magnetic Orders in Two-Dimensional Magnet CrI${}_3$
• Approaching magnetic ordering in graphene materials by FeCl${}_3$ intercalation
• Experimental evidence for non-Abelian gauge potentials in twisted graphene bilayers
• Very large magnetoresistance in Fe${}_{0.28}$TaS${}_2$ single crystals
• Disorder-induced two-step melting of vortex matter in Co-intercalated NbSe${}_2$ single crystals

Cited by in corpus (2)

• Magnetic order and its interplay with structure phase transition in van der Waals ferromagnet VI${}_3$
• Optimizing Hubbard U parameters for Enhanced Description of Electronic and Magnetic Properties in CrI${}_3$ Monolayers and Bilayers