Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Magnetization and Demagnetization Dynamics I
MA 16.1: Vortrag
Dienstag, 8. März 2016, 09:30–09:45, H34
Three-dimensional Character of the Magnetization Dynamics in Magnetic Vortex Structures — •Matthias Noske1, Hermann Stoll1, Manfred Fähnle1, Georg Dieterle1, Johannes Förster1, Markus Weigand1, Ajay Gangwar2, Georg Woltersdorf3, Andrei Slavin4, Christian H. Back2, and Gisela Schütz1 — 1Max Planck Institute for Intelligent Systems, Stuttgart, Germany — 2Department of Physics, University of Regensburg, Germany — 3Department of Physics, Martin Luther University, Halle, Germany — 4Department of Physics, Oakland University, Rochester, MI, United States
Three-dimensional linear spin-wave eigenmodes of a Permalloy disk having finite thickness are studied by micromagnetic simulations based on the Landau-Lifshitz-Gilbert equation. The eigenmodes found in these simulations are interpreted as linear superpositions (hybridizations) of ’approximate’ three-dimensional eigenmodes, which are the fundamental gyromode G0, the spin-wave modes and the higher-order gyromodes GN (flexure modes), the thickness dependence of which is represented by perpendicular standing spin waves. This hybridization leads to new and surprising dependencies of the mode frequencies on the disk thickness. The three-dimensional character of the eigenmodes is essential to explain the recent experimental results on vortex-core reversal observed in relatively thick Permalloy disks.