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MA: Fachverband Magnetismus
MA 12: Skyrmions I
MA 12.13: Vortrag
Montag, 18. März 2024, 18:15–18:30, EB 301
Tunable topological magnetism in superlattices of nonmagnetic B20 systems — •Vladislav Borisov1, Anna Delin2,3,4, and Olle Eriksson1,3 — 1Uppsala University, Sweden — 2KTH Royal Institute of Technology, Stockholm, Sweden — 3Wallenberg Initiative Materials Science for Sustainability (WISE) — 4SeRC (Swedish e-Science Research Center), KTH Stockholm, Sweden
Using atomistic spin dynamics simulations, we predict topological magnetism in hitherto uninvestigated multilayers of B20 compounds. We address up to 2·106 spins in the simulations, with magnetic interactions calculated from density functional theory [1,2]. We assume atomically sharp interfaces. Our main focus is on FeSi/CoSi and FeSi/FeGe superlattices with varying number of layers and interface types. First, we show that finite magnetism appears near the FeSi/CoSi interfaces. B20 layers further away from the interface are non-magnetic, similarly to bulk FeSi and CoSi compounds. Our simulations [3] predict stable antiskyrmions in [001]-oriented FeSi/CoSi, intermediate skyrmions in [111]-oriented FeSi/CoSi, and Bloch skyrmions in the FeSi/FeGe(001) multilayer. The skyrmion sizes vary between 7 and 37 nm. The unusual characters of the topological textures can be attributed to the complex structure of the Dzyaloshinskii-Moriya matrix, which is quite different compared to known magnets. Importantly, we also show that it is possible to stabilize AFM skyrmions as well, which can be interesting for applications due to their zero skyrmion Hall effect.
1. A. Szilva et al., Rev. Mod. Phys. 95, 035004 (2023).
2. arXiv:2310.08628. 3. arXiv:2309.14421.
Keywords: skyrmions; topological magnetism; B20 compounds; density functional theory; spin dynamics