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MA: Fachverband Magnetismus
MA 31: Poster II
MA 31.27: Poster
Mittwoch, 19. März 2025, 17:00–19:30, P1
Angle-dependent pumping of magnon Bose-Einstein condensates — •Franziska Kühn1, Matthias R. Schweizer1, Georg von Freymann1,2, Alexander A. Serga1, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Fraunhofer Institute for Industrial Mathematics ITWM, Fraunhofer Platz 1, 67663 Kaiserslautern, Germany
Our work focuses on the generation and behavior of magnon Bose-Einstein condensates (BEC) in yttrium-iron-garnet films. To create a magnon BEC, the magnon gas must be populated above the thermal level by external injection of magnons. Conventionally, this is done by parallel parametric pumping, where magnons are injected into spin-wave modes at half the pumping frequency. This work aims to optimize the pumping configuration by changing the direction of the microwave pumping field relative to the external magnetic field. This concept of oblique pumping promises higher efficiency and easier manipulation of the magnon BEC. The measurements are performed using a vector magnet for the rotation of the external magnetic field and Brillouin light scattering spectroscopy as an optical detection method for magnons. First results promise lower thresholds for the pumping power and thus easier excitation of magnons leading to a magnon BEC. This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-TRR 173/3-268565370 Spin+X (Project B04)
Keywords: Spin Waves; Magnon Bose-Einstein Condensate; Parametric Pumping; Brillouin Light Scattering Spectroscopy