SKM 2023 – scientific programme

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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 Xu^2,3, Nikolaos Ntallis¹, Rebecca Clulow⁴, Vitalii Shtender⁴, Johan Cedervall⁵, Martin Sahlberg⁴, Kjartan Thor Wikfeldt⁶, Danny Thonig^7,1, Manuel Pereiro¹, Anders Bergman¹, Anna Delin^2,3, and Olle Eriksson^1,7 — 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 — 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 Co_1−xRu_xSi systems both in powder and single-crystal forms.