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Moiré materials

Uncovering magnetic interactions in moiré magnets

Nature Computational Science volume 3, pages 282–284 (2023)Cite this article

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Two computational methods — one physics-based, and the other one deep-learning based — are proposed to enable the systematic investigation of magnetic order in moiré magnets from first principles.

The experimental realization of twisted graphene has opened new perspectives in the field of 2D materials. In the case of bilayer graphene, small twist angles, namely magic angles (θ < 2°), induce flat bands in the electronic structure, which introduce strong correlation effects and further give rise to interesting phenomena such as superconductivity3. Interlayer magnetic interactions in bilayer 2D ferromagnetic semiconductors, such as CrI3 (ref. 4), have attracted increased research interest, since the magnetic or Heisenberg exchange interaction between the layers in these materials is strongly dependent on the stacking configuration5 (Fig. 1b). A rhombohedral stacking favors a ferromagnetic interlayer interaction, while a monoclinic stacking gives rise to an antiferromagnetic coupling. Since twisted bilayer magnets present regions with different staking (Fig. 1b), the formation of magnetic domain walls along the moiré superstructure is expected, which might be accompanied by the emergence of noncollinear spin textures such as skyrmions6 (Fig. 1c).

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Fig. 1: Schematics of magnetic skyrmion formation and the sliding-mapping approach.

panel c adapted from ref. 2, Springer Nature America Inc

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  1. Departamento de Física Aplicada, Universidad de Alicante, Alicante, Spain

    David Soriano

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  1. David Soriano
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Correspondence to David Soriano.

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Soriano, D. Uncovering magnetic interactions in moiré magnets. Nat Comput Sci 3, 282–284 (2023). https://doi.org/10.1038/s43588-023-00434-1

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