Spirals and skyrmions in antiferromagnetic triangular lattices

Fang, Wuzhang; Raeliarijaona, Aldo; Chang, Po-Hao; Kovalev, Alexey A.; Belashchenko, Kirill D.

doi:10.1103/physrevmaterials.5.054401

Title: Spirals and skyrmions in antiferromagnetic triangular lattices

Journal Article · Tue May 04 00:00:00 EDT 2021 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.5.054401· OSTI ID:1781635

Fang, Wuzhang ^[1]; Raeliarijaona, Aldo ^[1]; Chang, Po-Hao ^[1]; Kovalev, Alexey A. ^[1];

^[1]

Univ. of Nebraska, Lincoln, NE (United States)

In this work, 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 MoS₂, WS₂, or WSe₂ 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/MoS₂, Fe/MoS₂, and Fe/WSe₂ interfaces can host spin spirals formed from the 120 degrees antiferromagnetic states. Our results further suggest that for interfaces, such as Fe/MoS₂, 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.

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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)

Grant/Contract Number:: SC0021019; AC02-05CH11231; DMR-1420645; DMR-1916275

OSTI ID:: 1781635

Journal Information:: Physical Review Materials, Vol. 5, Issue 5; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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