Doping effects and higher-order magnetic interactions in skyrmionic B20 compounds
ORAL
Abstract
Skyrmionic B20 compounds based on FeSi and CoSi doped with 3d, 4d and 5d transition metals are studied theoretically using a combination of density functional theory and dynamical mean-field theory. Using the magnetic force theorem, we obtain a detailed picture of magnetic interactions, including Heisenberg, Dzyaloshinskii-Moriya (DM), and symmetric anisotropic exchange. From these calculated interactions, we perform micromagnetic simulations under external field and find non-collinear magnetic phases with a small spatial period. Our results demonstrate that 4d and 5d doping enhances substantially the effect of the DM interaction compared to the 3d-doped case, such as the experimentally studied (Fe1-xCox)Si B20 system. We have also extended the theoretical framework, in order to explore the higher-order multispin interactions, which can contribute significantly to skyrmion stability and dynamics.
*This work was supported by the Knut and Alice Wallenberg Foundation and the Swedish National Infrastructure for Computing. O.E. also acknowledges support by the Swedish Research Council (VR), the Foundation for Strategic Research (SSF), the Swedish Energy Agency, the European Research Council (ERC synergy grant), eSSENCE and STandUP. D.T., Y.K. and L.N. acknowledge support by the VR.
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Presenters
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Vladislav Borisov
- Department of Physics and Astronomy, Uppsala University
- Goethe-University Frankfurt
- Institut für Theoretische Physik, Goethe University Frankfurt