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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. Bozhko^1,2, 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.