Current-driven resonant excitation of magnetic vortex

Details Current-driven resonant excitation of magnetic vortex Current-driven resonant excitation of magnetic vortex

2006-04-05

arxiv.org/abs/cond-mat/0604123v1

Physics

Condensed Matter

Other Condensed Matter

16 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.107204

A magnetic vortex core in a ferromagnetic circular nanodot has a resonance frequency originating from the confinement of the vortex core. By the micromagnetic simulation including the spin-transfer torque, we show that the vortex core can be resonantly excited by an AC (spin-polarized) current through the dot and that the resonance frequency can be tuned by the dot shape. The resistance measurement under the AC current successfully detects the resonance at the frequency consistent with the simulation.

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