SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Posters Magnetism V
MA 18.22: Poster
Freitag, 1. Oktober 2021, 10:00–13:00, P
Finite-element dynamic-matrix approach to calculate spin-wave dispersions in waveguides with arbitrary cross section — •Lukas Körber1,2, Gwen Quasebarth1,2, Andreas Otto2, and Attila Kákay1 — 1Helmholtz-Zentrum Dresden - Rossendorf, Dresden Germany — 2Technische Universität Dresden
One of the key objectives in curvilinear magnetism is the determination of the spin-wave dispersion and mode profiles in magnetic waveguides with surface curvature. Due to the geometrical complexity, dynamic micromagnetic simulations are often used to obtain quantitive predictions where only approximate analytical approaches are available. However, especially in geometries which require an accurate modeling of the sample surface, these dynamic micromagnetic simulations become computionally exhausting. To address this challenge, we present a finite-element dynamic-matrix approach to efficiently calculate the dispersion and spatial mode profiles of spin waves propagating in waveguides with arbitrary cross section where the equilibrium magnetization is invariant along the propagation direction. This is achieved by solving a linearized version of the equation of motion of the magnetization numerically only in a single cross section of the waveguide at hand. To take account of the dipolar interaction we present an extension of the well-known Fredkin-Koehler method to plane waves. As an application of our method, we present the first results on the spin-wave dispersion in nanotubes with thick shell which exhibits higher-order standing modes along the radial direction as well as an extremely strong dispersion asymmetry compared to thin-shell nanotubes.