Spirals and skyrmions in antiferromagnetic triangular lattices
| Autor: | Fang, Wuzhang, Raeliarijaona, Aldo, Chang, Po-Hao, Kovalev, Alexey A., Belashchenko, Kirill D. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. Materials 5, 054401 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.5.054401 |
| Popis: | We study realizations of spirals and skyrmions in two-dimensional antiferromagnets with a triangular lattice on an inversion-symmetry-breaking substrate. As a possible material realization, we investigate the adsorption of transition-metal atoms (Cr, Mn, Fe, or Co) on a monolayer of MoS$_2$, WS$_2$, or WSe$_2$ and obtain the exchange, anisotropy, and Dzyaloshinskii-Moriya interaction parameters using first-principles calculations. Using energy minimization and parallel-tempering Monte-Carlo simulations, we determine the magnetic phase diagrams for a wide range of interaction parameters. We find that skyrmion lattices can appear even with weak Dzyaloshinskii-Moriya interactions, but their stability is hindered by magnetic anisotropy. However, a weak easy plane magnetic anisotropy can be beneficial for stabilizing the skyrmion phase. Our results suggest that Cr$/$MoS$_2$, Fe$/$MoS$_2$, and Fe$/$WSe$_2$ interfaces can host spin spirals formed from the 120$^{\circ}$ antiferromagnetic states. Our results further suggests that for other interfaces, such as Fe$/$MoS$_2$, the Dzyaloshinskii-Moriya interaction is strong enough to drive the system into a three-sublattice skyrmion lattice in the presence of experimentally feasible external magnetic field. Comment: 11 pages, 10 figures |
| Databáze: | arXiv |
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