Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Poster I

MA 20.7: Poster

Dienstag, 19. März 2024, 16:30–19:00, Poster A

Magnon-Fluxon Dynamics in Superconductor/Ferromagnet Periodic Structures — •Björn Niedzielski and Jamal Berakdar — Martin-Luther Universität Halle-Wittenberg, Halle, Germany

Over the past decades coupled superconductor/ferromagnet (SC/FM) materials has been in the focus of research. Hybrid structures of this form are of fundamental interest and hold promising prospects for information technology. One idea is to use the stray field interaction between superconducting matter and ferromagnets to manipulate the propagation of spin waves in a magnonic wave guide. In this way a superconducting vortex lattice can act as a building block for a reconfigurable magnonic crystal with unique properties. Despite intensive research on this subject the fascinating nature of the coupled dynamics of SC/FM hybrids is not fully understood yet and only recently the first experimental evidence for magnon-fluxon-interaction has been found by Dobrovolskiy et al. (Nature Physics, 15, 477 (2019)).

Here we are aiming at understanding the magnetization dynamics of a SC/FM bilayer by simulating such a structure under realistic conditions. To this end we solve the coupled time-dependent Ginzburg-Landau equations for superconductivity and the Landau-Lifschitz-Gilbert equation for the magnetization dynamics. In accordance with the experiment we found that the presence of the vortices leads to the formation of a Bloch-like band structure in the magnonic spectrum. The width and position of these bands was observed to be highly susceptible to various system parameters like the FM geometry and structural imperfections in the vortex lattice.

Keywords: magnon; fluxon; ferromagnet; superconductor; vortex