Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Magnonics 1
MA 13.8: Vortrag
Dienstag, 6. September 2022, 11:15–11:30, H43
Control of the Magnon Bose-Einstein Condensation by the Spin Hall Effect — •Michael Schneider1, David Breitbach1, Alexander A. Serga1, Andrei N. Slavin2, Vasyl S. Tyberkevich2, Björn Heinz1, Bert Lägel1, Carsten Dubs3, Philipp Pirro1, Burkard Hillebrands1, and Andrii V. Chumak4 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany — 2Department of Physics, Oakland University, Rochester, Michigan 48326, USA — 3INNOVENT e.V. Technologieentwicklung, D-07745 Jena, Germany — 4Faculty of Physics, University of Vienna, A-1090 Vienna, Austria
Generally, magnon Bose-Einstein condensation (BEC) is achieved by increasing the particle density. Previously, it was shown that the rapid cooling of yttrium-iron garnet/Pt nanostructures, preheated by an electric current passed through the Pt layer, leads to an imbalance between the magnon and the phonon system. Consequently, magnon BEC is triggered by the excess of magnons.
We report on the additional contribution of the spin Hall effect (SHE), generating a spin current in the Pt layer. Depending on the orientation of the electric current and the applied field, the SHE injects or annihilates magnons. We find that the SHE contribution prevents or promotes the rapid-cooling induced magnon BEC, changing the BEC threshold by -8% to +6% depending on the current polarity. These results demonstrate a new method for controlling macroscopic quantum states and pave the way for its application in spintronic devices.