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MA: Fachverband Magnetismus

MA 31: Magnonics I

MA 31.10: Talk

Wednesday, March 14, 2018, 17:45–18:00, H 0110

Bose-Einstein Condensation of Quasi-Particles in a Dynamically Cooled System — •Michael Schneider¹, Thomas Brächer¹, Viktor Lauer¹, Phillip Pirro¹, Alexander A. Serga¹, Bert Lägel², Carsten Dubs², Andrei Slavin³, Vasyl S. Tiberkevich³, Burkard Hillebrands¹, and Andrii V. Chumak¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany — ²INNOVENT e.V., Technologieentwicklung, Jena, Germany — ³Oakland University, Rochester, USA

Recently the formation of magnon Bose-Einstein Condensates (BEC) in extended films attracted large attention. In previous studies the conditions for the formation of the BEC are artificially created by parametric pumping. Here we present a fundamentally new approach. Fast DC current pulses applied to yttrium-iron-garnet (YIG)/Pt micro- structures result in a strong heating. Consequently, this leads to an increased number of magnons, distributed over the whole spectrum. Once the current is switched off the micro-sized system cools down rapidly. This results in a strong increase of the magnon density at the bottom of the spectrum. That is observed using time-resolved Brillouin light scattering spectroscopy. Our experiment shows, that the BEC formation depends on the magnon temperature and the timescale of the cooling process. This research has been supported by ERC Starting Grant 678309 MagnonCircuits, ERC Advanced Grant 694709 Super-Magnonics and DFG Grant DU 1427/2-1.