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Current-driven ferromagnetic resonance, mechanical torques and rotary motion in magnetic nanostructures

Alexey A. Kovalev·Gerrit E. W. Bauer·Arne Brataas
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Abstract

We study theoretically the detection and possible utilization of electric current-induced mechanical torques in ferromagnetic-normal metal heterostructures that are generated by spin-flip scattering or the absorption of transverse spin currents by a ferromagnet. To this end, we analyze the DC voltage signals over a spin valve that is driven by an AC current. In agreement with recent studies, this "rectification", measured as a function of AC frequency and applied magnetic field, contains important information on the magnetostatics and --dynamics. Subsequently, we show that the vibrations excited by spin-transfer to the lattice can be detected as a splitting of the DC voltage resonance. Finally, we propose a concept for a spin-transfer-driven electric nanomotor based on integrating metallic nanowires with carbon nanotubes, in which the current-induced torques generate a rotary motion.

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Alexey A. Kovalev, Gerrit E. W. Bauer, Arne Brataas. 2010-01-01. Current-driven ferromagnetic resonance, mechanical torques and rotary motion in magnetic nanostructures. https://doi.org/10.1103/physrevb.75.014430

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