Stacking tunable interlayer magnetism in bilayer CrI3

Abstract

Diverse interlayer tunability of physical properties of two-dimensional layers mostly lies in the covalent-like quasi-bonding that is significant in electronic structures but rather weak for energetics. Such characteristics result in various stacking orders that are energetically comparable but may significantly differ in terms of electronic structures, e.g. magnetism. Inspired by several recent experiments showing interlayer anti-ferromagnetically coupled CrI3 bilayers, we carried out first-principles calculations for CrI3 bilayers. We found that the anti-ferromagnetic coupling results from a new stacking order with the C2/m space group symmetry, rather than the graphene-like one with R3 as previously believed. Moreover, we demonstrated that the intra- and inter-layer couplings in CrI3 bilayer are governed by two different mechanisms, namely ferromagnetic super-exchange and direct-exchange interactions, which are largely decoupled because of their significant difference in strength at the strong- and weak-interaction limits. This allows the much weaker interlayer magnetic coupling to be more feasibly tuned by stacking orders solely. Given the fact that interlayer magnetic properties can be altered by changing crystal structure with different stacking orders, our work opens a new paradigm for tuning interlayer magnetic properties with the freedom of stacking order in two dimensional layered materials.

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• Effect of biaxial strain and hydrostatic pressure on the magnetic properties of bilayer CrI3
• Creating a three dimensional intrinsic electric dipole on rotated CrI${}_3$ bilayers
• Interlayer magnetic interactions in $\pi /3$-twisted bilayer CrI${}_3$
• Mechanism of carrier doping induced magnetic phase transitions in two-dimensional materials
• Stacking-dependent Electronic and Topological Properties in van der Waals Antiferromagnet MnBi${}_2$Te${}_4$ Films
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• Superexchange and spin-orbit coupling in monolayer and bilayer chromium trihalides
• Magnon dispersion in bilayers of two-dimensional ferromagnets
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