Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4939268
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Funding
- EU-FET grant InSpin [612759]
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1538]
- State Fund for Fundamental Research of Ukraine (SFFR)
- Graduate School Material Sciences in Mainz
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The damping of spin waves parametrically excited in the magnetic insulator Yttrium Iron Garnet (YIG) is controlled by a dc current passed through an adjacent normal-metal film. The experiment is performed on a macroscopically sized YIG(100 nm)/Pt(10 nm) bilayer of 4 x 2 mm(2) lateral dimensions. The spin-wave relaxation frequency is determined via the threshold of the parametric instability measured by Brillouin light scattering spectroscopy. 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 spin Hall effect. This spin current exerts a spin transfer torque in the YIG film and, thus, changes the spin-wave damping. Depending on the polarity of the applied dc current with respect to the magnetization direction, the damping can be increased or decreased. The magnitude of its variation is proportional to the applied current. A variation in the relaxation frequency of +/- 7.5% is achieved for an applied dc current density of 5 x 10(10) A/m(2). (C) 2016 AIP Publishing LLC.
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