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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.39: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Effective Hamiltonian descriptions for skyrmion and antiskyrmion dynamics — •Benjamin F. McKeever1,2, Davi R. Rodrigues3,2, Matthias Sitte1, Jairo Sinova1,4, Artem Abanov3, and Karin Everschor-Sitte1 — 1Institut für Physik, Johannes Gutenberg-Universität, Mainz 55128, Germany — 2Graduate School Materials Science in Mainz, Mainz 55128, Germany — 3Department of Physics & Astronomy, Texas A&M University, College Station, Texas, USA — 4Insitute of Physics ASCR, 162 53 Phraha 6, Czech Republic
The dynamics of magnetic textures described by the Landau-Lifshitz-Gilbert equation is complex. However, the description of the low energy physics often requires only a reduced set of effective variables. One route to such a description follows a generalization of the method by Thiele, originally introduced for the steady translational motion of rigid domains, involving direct manipulations of the Landau-Lifshitz-Gilbert equation. Here we exploit an alternative, equivalent method that is independent of microscopic details and derives a general effective Hamiltonian description from an action principle. The advantage of this formalism is that it can be extended to magnetic textures with soft internal modes and does not rely on the usual rigid texture approximation. We first present the general formalism and apply to it to the known example of the translational modes of rigid skyrmions. Then we study the circular internal modes of skyrmions and antiskyrmions that are stabilized by anisotropic Dzyaloshinskii-Moriya interactions, and finally the gyration modes of skyrmions and antiskyrmions.