Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.37: Poster
Tuesday, April 2, 2019, 10:00–13:00, Poster E
Magnon Chemical Potential Evolution in the BEC Formation by Rapid Cooling — •Michael Schneider1, Thomas Brächer1, Viktor Lauer1, Phillip Pirro1, Dmytro A. Bozhko1, Alexander A. Serga1, Halyna Yu. Musiienko-Shmarova1, Björn Heinz1,2, Qi Wang1, Thomas Meyer3, Frank Heussner1, Sascha Keller1, Evangelos Th. Papaioannou1, Bert Lägel1, Thomas Löber1, Vasyl S. Tiberkevich4, Andrei N. Slavin4, Carsten Dubs5, Burkard Hillebrands1, and Andrii V. Chumak1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern — 2Graduate School Materials Science in Mainz, Staudingerweg 9, D-55128 Mainz — 3THATec Innovation GmbH, Bautzner Landstraße 400, D-01328 Dresden — 4Department of Physics, Oakland University, Rochester — 5INNOVENT e.V. Technologieentwicklung, Prüssingstraße 27B, D-07745 Jena
Recently we presented a fundamentally new approach for the formation of a magnon Bose-Einstein Condensate (BEC) due to the rapid cooling of a preheated magnetic nano-structure. Using time-resolved Brillouin light scattering spectroscopy (BLS), a strong increase of the magnon population at the bottom of the spectrum is observed. Here we show the direct measurement of the chemical potential by means of BLS. The potential is found to reach the minimum magnon energy confirming the BEC formation. This research has been supported by ERC StG 678309 MagnonCircuits, ERC AdG 694709 SuperMagnonics and DFG Grant DU 1427/2-1.