Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.17: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Electrical detection of internally pumped magnons — •Timo Noack, Vitaliy Vasyuchka, Dymitro Bozhko, Burkard Hillebrands, and Alexander Serga — TU Kaiserslautern, Fachbereich Physik and Landesforschungszentrum OPTIMAS, Germany

The method of parallel parametric pumping is a widely used method for the generation of dence groups of magnons with well defined wavevectors and frequencies. In the process of four-magnon scattering these magnons thermalize in a wide range of energy-momentum spin-wave spectrum. As well, Bose-Einstein condensation of the thermalized magnons is possible at the lowest energy state. In this contribution we show an impact of parametrically pumped, thermalized, and condensed magnons on the electrical detection of spin currents in yttrium iron garnet/platinum bilayers. Therefore, spin pumping magnitude was time dependent measured using the inverse Spin Hall effect (ISHE). In ISHE waveforms an enhancement in the voltage amplitude is observed after the external pumping pulse is switched off. This enhancement is understood as a result of the excitation of secondary magnons at the YIG/Pt interface in the process of nonlinear thermalization of freely evolving parametric magnons. Financial support from the Deutsche Forschungsgemeinschaft in the frame of SFB/TR 49 is acknowledged.