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MA: Fachverband Magnetismus

MA 21: Skyrmions II

MA 21.2: Vortrag

Dienstag, 10. März 2026, 14:15–14:30, HSZ/0004

Theoretical study on excitation in anti-Skyrmion lattice — •László Udvardi, Mátyás Török, and László Szunyogh — Department of Theoretical Physics, Budapest University of Technology and Economic

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 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. Our study is focused on objects with topological charge of Q=1 anti-Skyrmion. Anti-skyrmions exhibit attractive inter-particle interaction and they have tendency to form clusters or skyrmionic lattice. The excitation spectrum of an anti-skyrmon lattice with various external magnetic field has been calculated. The low energy excitation responsible for the low temperature behavior of the system shows similarities to nematic liquid crystals.

Keywords: anti-skyrmion; excitation spectrum; theoretical study