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MA: Fachverband Magnetismus

MA 29: Skyrmions II

MA 29.11: Vortrag

Mittwoch, 19. März 2025, 17:45–18:00, H20

Interactions between Skyrmions with various topological charges — •László Udvardi and Mátyás Török — Department of Theoretical Physics, Budapest University of Technology and Economics, Budapest, Hungary

Magnetic Skyrmions exhibit intriguing and novel phenomena due to their topologically non-trivial spin textures. Their exceptional stability makes them possible candidates for information carriers for future spintronic devices.

We have determined the parameters appearing in a classical spin model from first principle for a FePd bilayer on Ir(111) and Pt₉₅Ir₀₅/Pd(111) overlayer. Optimizing the energy of the spin model several local minima have been identified as a Skyrmion with various topological charges. We demonstrate that the frustration of the isotropic exchange interactions is responsible for the creation of these various types of skyrmionic structures. We focused on objects with topological charge of Q=-1 (Skyrmion) and Q=1 (anti Skyrmion) and explored the interactions between them. We found that although the interaction between Skyrmions with Q=-1 is always repulsive it has attractive part between anti Skyrmions. The excitation of an isolated Skyrmion and a lattice has been also investigated.

Keywords: Skyrmions; interactions; thin films