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MA: Fachverband Magnetismus

MA 47: Skyrmions IV

MA 47.6: Talk

Friday, March 31, 2023, 10:45–11:00, HSZ 04

Skyrmions in 4d- and 5d-doped B20 compounds — •Vladislav Borisov1, Qichen Xu2,3, Nikolaos Ntallis1, Rebecca Clulow4, Vitalii Shtender4, Johan Cedervall5, Martin Sahlberg4, Kjartan Thor Wikfeldt6, Danny Thonig7,1, Manuel Pereiro1, Anders Bergman1, Anna Delin2,3, and Olle Eriksson1,71Department 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 — 4Department of Chemistry, Uppsala University, Sweden — 5Department of Materials and Environmental Chemistry, Stockholm University, Sweden — 6PDC Center for High Performance Computing, KTH Royal Institute of Technology, Stockholm, Sweden — 7Örebro University, Örebro, Sweden

Based on theoretical calculations, we predict that 4d- and 5d-doped FeSi and CoSi compounds host skyrmions with a size between 50 nm for (Co,Os)Si and 148 nm for (Fe,Co)Si. Calculations are done using the full-potential linear muffin-tin orbital method and magnetic force theorem which allow to address the Heisenberg and Dzyaloshinskii-Moriya (DM) interactions, and the skyrmionic properties were determined using micromagnetic simulations. We find that the 5d doping (by Ir or Os) is particularly efficient in terms of enhancing the DM interaction. Convex-hull analysis suggests that the doped compounds are structurally stable, and we have managed to synthesize and characterize Co1−xRuxSi systems both in powder and single-crystal forms.

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