Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Spin currents and spin torques
MA 27.3: Vortrag
Mittwoch, 14. März 2018, 10:00–10:15, EB 407
Enhancement of the Spin Pumping Effect by Two-Magnon Confluence Process in YIG-Pt Bilayers. — •Timo B. Noack, Vitaliy I. Vasyuchka, Dymitro A. Bozhko, Burkard Hillebrands, and Alexander A. Serga — TU Kaiserslautern, Kaiserslautern, Deutschland
Magnon spin currents are seen as a promising alternative to electrical charge currents for the transport and processing of information. Besides magnon-based elements operating with analogous and digital data, the field of modern magnon spintronics crucially depends on the progress in developing of effective converters between the magnon subsystem and the electron-carried spin and charge currents. This task is especially challenging in a case of short-wavelength exchange magnons, which application is promising for the miniaturization of magnonic devices. In Platinum (Pt) covered magnetic insulators such as Yttrium Iron Garnet (YIG, Y3Fe5O12) films, combined action of the inverse spin-Hall effect (iSHE) and the spin-pumping (SP) effect constitutes an important mechanism allowing for the detection of this kind of magnons: Here, we present our studies on the efficiency of spin pumping in in-plane magnetized Pt-covered YIG films of different thicknesses. In our time-resolved field-dependent measurements of the iSHE-voltage, it has been found that at the given pumping frequency of fp= 14.449 GHz a clearly visible sharp voltage peak appears at a bias magnetic field of approximately 1 kOe. This peak can be related to the confluence of two parametrically excited magnons with frequencies fp/2 and wavevectors kp into one magnon (fp, 2kp).