SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 47: Skyrmions IV
MA 47.3: Talk
Friday, March 31, 2023, 10:00–10:15, HSZ 04
Dzyaloshinskii-Moriya interactions in skyrmionic lacunar spinel GaV4S8 — •Vladislav Borisov1, Patrik Thunström1, Anna Delin2,3, and Olle Eriksson1,4 — 1Department of Physics and Astronomy, Uppsala University, Sweden — 2Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, Stockholm, Sweden — 3SeRC (Swedish e-Science Research Center), KTH Royal Institute of Technology, Stockholm, Sweden — 4Örebro University, Örebro, Sweden
Using the first-principles full-potential linear muffin-tin orbital method and magnetic force theorem we study the Heisenberg and Dzyaloshinskii-Moriya interactions in the lacunar spinel GaV4S8. This material hosts magnetic Néel skyrmions, in contrast to most other bulk magnets. The symmetry of the calculated DM vectors agrees with the C3v structural symmetry and supports the stability of Néel skyrmions. The sizes of the magnetic interactions show some variations as a function of electronic correlations. These changes are also reflected in the estimated wavelength of the helical magnetic state. Our theoretical results indicate that the electronic and magnetic properties depend strongly on the spin configuration of the V4 clusters, on which there is no clear consensus in the literature, and we make a suggestion for the configuration that fits better to the known measurements.