R. H. Liu, W. L. Lim, S. Urazhdin
We study the effects of a pure spin current on the magnetization of a Permalloy film. The spin current is generated due to the spin Hall effect by locally injecting an in-plane electric current into an adjacent Pt layer. Microwave spectroscopy shows that the spin current induces coherent oscillations of the magnetization of Permalloy, resulting in emission of microwave radiation due to the anistoropic magnetoresistance. The frequency of the emitted microwaves is always lower than the ferromagnetic resonance frequency of the ferromagnet, indicating that the oscillation forms a non-propagating spin wave "bullet". Our measurements demonstrate the viability of active magnetoelectronic microwave devices operated by pure spin currents.
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http://arxiv.org/abs/1210.2758
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