Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 12: Skyrmions 1 (joint session MA/KFM)

KFM 12.11: Vortrag

Dienstag, 6. September 2022, 12:15–12:30, H37

Topological magnetism in multiferroic lacunar spinels — •Vladislav Borisov1, Patrik Thunström1, Anna Delin2, and Olle Eriksson1,31Ångström Laboratory, Uppsala University, Uppsala, Sweden — 2Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, Stockholm, Sweden — 3Örebro University, Örebro, Sweden

Several skyrmionic magnetic systems have been discovered since the first observation of skyrmions in a B20 compound MnSi. Only a few of them host not just magnetism but also ferroelectricity and prominent examples are lacunar spinels GaV4S8 and GaV4Se8. These bulk systems are rather unique, because they host Neel skyrmions, which are otherwise only observed in metallic multilayers. Detailed description of magnetic phenomena in the multiferroic spinels is challenging for theory due to correlations within the V4 clusters.

We study the role of the magnetic state of these clusters and electronic correlations for the Heisenberg and Dzyaloshinskii-Moriya interactions in V- and Mo-based lacunar spinels. The character of magnetic interactions is discussed in relation to the crystal symmetry and electronic properties derived from the V4 molecular orbitals. Based on micromagnetic simulations, we determine the role of different interactions for the formation of magnetic textures.

This work was supported by the Knut and Alice Wallenberg Foundation, the Swedish Research Council and the Swedish National Infrastructure for Computing.

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