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.
@article{arxiv.cond-mat/0609258,
title = {Current-driven ferromagnetic resonance, mechanical torques and rotary motion in magnetic nanostructures},
author = {Alexey A. Kovalev and Gerrit E. W. Bauer and Arne Brataas},
journal= {arXiv preprint arXiv:cond-mat/0609258},
year = {2010}
}
Comments
This resubmission corrects typos in Appendix A 26 pages, 7 figures