SKM 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.14: Poster
Mittwoch, 29. September 2021, 13:30–16:30, P
Nonlinear relaxation of quantized propagating magnons in nanodevices — •Morteza Mohseni1, Qi Wang2, Björn Heinz1, Michael Schneider1, Felix Kohl1, Carsten Dubs3, Andrii V. Chumak2, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria — 3INNOVENT e.V., Technologieentwicklung, Prüssingstraße 27B, 07745 Jena, Germany
The use of spin waves and their quanta, the magnons, opens many opportunities in designing novel data processing units. Relaxation of linear spin waves is well described by viscous Gilbert damping processes. However, for strong excitations, nonlinear damping processes such as the decay via magnon-magnon interactions emerge and trigger additional relaxation channels. Such nonlinear dynamics are essential for the generation of magnon Bose-Einstein condensates, although their characteristics are not well investigated in magnonic nanostructures. We investigate the nonlinear relaxation of strongly generated spin waves in yttrium iron garnet nanodevices. We show that the nonlinear magnon relaxation in this highly quantized system possesses intermodal features, i.e., magnons scatter to other quantized modes through a cascade of scattering events. A further discussion of the phenomenon in the regime of its fundamental limitations is given.