期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-020-19535-w
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资金
- Nanoscience Foundries and Fine Analysis (NFFA-MIUR Italy) project
- Italian Ministry for Research and Education through PRIN-2017 project Tuning and understanding Quantum phases in 2D materials-Quantum 2D (IT-MIUR Grant) [2017Z8TS5B]
- Italian Ministry for Research and Education through PRIN-2017 project TWEET: Towards Ferroelectricity in two dimensions (IT-MIUR) [2017YCTB59]
- ISCRA C [IsC66-I-2DFM, IsC72-2DFmF]
- ISCRA B [IsB17-COMRED, HP10BSZ6LY]
Topological spin structures, such as magnetic skyrmions, hold great promises for data storage applications, thanks to their inherent stability. In most cases, skyrmions are stabilized by magnetic fields in non-centrosymmetric systems displaying the chiral Dzyaloshinskii-Moriya exchange interaction, while spontaneous skyrmion lattices have been reported in centrosymmetric itinerant magnets with long-range interactions. Here, a spontaneous anti-biskyrmion lattice with unique topology and chirality is predicted in the monolayer of a semiconducting and centrosymmetric metal halide, NiI2. Our first-principles and Monte Carlo simulations reveal that the anisotropies of the short-range symmetric exchange, when combined with magnetic frustration, can lead to an emergent chiral interaction that is responsible for the predicted topological spin structures. The proposed mechanism finds a prototypical manifestation in two-dimensional magnets, thus broadening the class of materials that can host spontaneous skyrmionic states. Skyrmions, topological spin textures, are typically stabilized by the Dzyaloshinskii-Moriya interaction and an applied magnetic field. In this theoretical study, by analysing monolayer NiI2, the authors suggest that two-site anisotropy with magnetic frustration can stabilize a skyrmion lattice.
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