SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.4: Poster
Wednesday, September 29, 2021, 13:30–16:30, P
Amplification of Propagating Spin Waves by Rapid Cooling — •David Breitbach1, Michael Schneider1, Bert Lägel1, Carsten Dubs2, Andrei N. Slavin3, Vasyl Tyberkevych3, Philipp Pirro1, Burkard Hillebrands1, and Andrii Chumak4 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Kaiserslautern, Germany — 2Innovent e.V. Technologieentwicklung, Jena, Germany — 3Department of Physics, Oakland University, Rochester, MI, United States — 4Faculty of Physics, University of Vienna, Vienna, Austria
Recently, the formation of a magnon Bose-Einstein Condensate (BEC) triggered by the rapid cooling of magnonic nano-structures has been reported [1]. A rapid decrease of the phonon temperature achieved after heating with an applied DC pulse in a nano-sized YIG|Pt sample leads to a non-equilibrium between the phonon and the magnon system. This results in a redistribution of magnons to the lowest frequencies of the spectrum and, finally, to the formation of a BEC. Building on this mechanism, we show the coherent amplification of externally excited, propagating spin waves in a YIG-waveguide using time-resolved BLS microscopy. This amplification is maximal when the spin-wave packet propagates through the Pt-region during the process of rapid cooling. This study shows the applicability of the rapid cooling mechanism to compensate for the intrinsic damping in spintronic devices and also gives insight into new physics, namely the interaction of a prepared coherent state with a magnon BEC. [1] M. Schneider, et. al., Nat. Nanotechnol. 15, 457-461 (2020)