Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Spin-Torque Phenomena
MA 30.10: Vortrag
Mittwoch, 9. März 2016, 12:30–12:45, H33
Spin-transfer torque based damping control of parametrically excited spin waves in a magnetic insulator — •Viktor Lauer1, Dmytro A. Bozhko1,2, Thomas Brächer1, Philipp Pirro1, Vitaliy I. Vasyuchka1, Alexander A. Serga1, Matthias Benjamin Jungfleisch1, Milan Agrawal1, Yurii V. Kobljanskyj3, Gennadii A. Melkov3, Carsten Dubs4, Burkard Hillebrands1, and Andrii V. Chumak1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Germany — 2Graduate School Material Science in Mainz, Germany — 3Faculty of Radiophysics, Electronics and Computer Systems, Taras Shevchenko National University of Kyiv, Ukraine — 4Innovent e.V., Jena, Germany
Our experimental studies address the spin-wave damping control in a macroscopically sized YIG(100nm)/Pt(10nm) bilayer, based on the spin Hall effect (SHE) and spin-transfer torque (STT). The application of a dc current to the Pt film leads to the formation of a spin-polarized electron current normal to the film plane due to the SHE. This spin current exerts a STT in the YIG film and, thus, changes the spin-wave damping. The variation of the spin-wave relaxation frequency is determined via the threshold of the parametric instability measured by Brillouin light scattering (BLS) spectroscopy. We show that depending on the polarity of the applied dc current with respect to the magnetization direction, the damping can be increased or decreased.
This work is financially supported by the EU-FET grant InSpin 612759.