Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 53: Magnonics II
MA 53.6: Talk
Thursday, March 19, 2020, 16:15–16:30, HSZ 401
Amplification of propagating spin waves by rapid cooling — •Michael Schneider1, David Breitbach1, Bert Lägel1, Carsten Dubs2, Halyna Musiienko-Shmarova1, Dmytro A. Bozhko3, Alexander A. Serga1, Andrei N. Slavin4, Vasyl S. Tiberkevich4, Burkard Hillebrands1, and Andrii V. Chumak5 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany — 2INNOVENT e.V. Technologieentwicklung, Jena, Germany — 3Department of Physics and Energy Science, University of Colorado at Colorado Springs, Colorado Springs, USA — 4Department of Physics, Oakland University, Rochester, USA — 5Faculty of Physics, University of Vienna, Austria
Recently we reported on the formation of a magnon Bose-Einstein Condensate triggered by a non-equilibrium between the magnon and the phonon system, achieved by rapid cooling of magnonic nano-structures. Here we report on the interaction of a propagating spin-wave with such a non-equilibrated system. The rapid cooling of a preheated, confined region of a micro scaled waveguide results in a redistribution of magnons to lower energies. During this, a spin-wave pulse propagating through the rapidly cooled area gets amplified. This amplification process is investigated with respect to the strength of the non-equilibrium and the delay between the spin-wave packet and the formation of the non-equilibrium. This research has been supported by ERC StG 678309 MagnonCircuits, ERC AdG 694709 SuperMagnonics and DFG Grant DU 1427/2-1.