Magnetic vortex oscillator driven by dc spin-polarized current

Details Magnetic vortex oscillator driven by dc spin-polarized current Magnetic vortex oscillator driven by dc spin-polarized current

2007-02-09

arxiv.org/abs/cond-mat/0702253v1

Physics

Condensed Matter

Other Condensed Matter

14 pages, 4 figures

Scientific paper

Transfer of angular momentum from a spin-polarized current to a ferromagnet provides an efficient means to control the dynamics of nanomagnets. A peculiar consequence of this spin-torque, the ability to induce persistent oscillations of a nanomagnet by applying a dc current, has previously been reported only for spatially uniform nanomagnets. Here we demonstrate that a quintessentially nonuniform magnetic structure, a magnetic vortex, isolated within a nanoscale spin valve structure, can be excited into persistent microwave-frequency oscillations by a spin-polarized dc current. Comparison to micromagnetic simulations leads to identification of the oscillations with a precession of the vortex core. The oscillations, which can be obtained in essentially zero magnetic field, exhibit linewidths that can be narrower than 300 kHz, making these highly compact spin-torque vortex oscillator devices potential candidates for microwave signal-processing applications, and a powerful new tool for fundamental studies of vortex dynamics in magnetic nanostructures.

Affiliated with

Also associated with

No associations

Rating

Magnetic vortex oscillator driven by dc spin-polarized current does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magnetic vortex oscillator driven by dc spin-polarized current, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic vortex oscillator driven by dc spin-polarized current will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-443659