Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnonics
MA 8.4: Vortrag
Montag, 1. April 2019, 15:45–16:00, H52
Magnon Bose-Einstein condensation in a wide temperature range — •Laura Mihalceanu, Dmytro A. Bozhko, Vitaliy I. Vasyuchka, Alexander A. Serga, and Burkard Hillebrands — Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
Today, magnon Bose-Einstein condensates (BEC) and supercurrents are experimentally confirmed phenomena, which exist on a macroscopic scale in parametrically driven spin systems at room-temperature. Allowing for a charge-free information transport and being, thus, free from ohmic heating these macroscopic quantum phenomena pave the path towards more efficient computing technologies. Specifically, they possess the potential for low power consumption information transfer and processing of phase-encoded data by nanometer-sized devices at GHz and THz frequencies. Temperature-dependent experiments provide valuable information about the magnon BEC as its lifetime, threshold, and coherency. Prior, we studied the relaxation behavior of parametrically injected magnons with wavenumbers ranging up to 6× 105 rad cm−1 from 20K to 340K by means of the conventional microwave technique. Here, we incorporate the Brillouin Light Scattering (BLS) spectroscopy via the direct detection of condensed magnons at the bottom of the spin-wave spectrum. This allows us to investigate the magnon BEC formation, as well as magnon supercurrents in a wide range of temperatures. By comparing the microwave results with those of the BLS measurements, we reveal a correlation between the damping of the parametric magnons and the BEC formation.