Spin-Torque-Induced Rotational Dynamics of a Magnetic Vortex Dipole

G. Finocchio; O. Ozatay; L. Torres; R. A. Buhrman; D. C. Ralph; B. Azzerboni

doi:10.1103/PhysRevB.78.174408

Spin-Torque-Induced Rotational Dynamics of a Magnetic Vortex Dipole

Mesoscale and Nanoscale Physics 2009-11-13 v2

Authors: G. Finocchio , O. Ozatay , L. Torres , R. A. Buhrman , D. C. Ralph , B. Azzerboni

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Abstract

We study, both experimentally and by numerical modeling, the magnetic dynamics that can be excited in a magnetic thin-film nanopillar device using the spin torque from a spatially localized current injected via a 10s-of-nm-diameter aperture. The current-driven magnetic dynamics can produce large amplitude microwave emission at zero magnetic field, with a frequency well below that of the uniform ferromagnetic resonance mode. Micromagnetic simulations indicate that the physical origin of this efficient microwave nano-oscillator is the nucleation and subsequent steady-state rotational dynamics of a magnetic vortex dipole driven by the localized spin torque. These results show this novel implementation of a spintronic nano-oscillator is a promising candidate for microwave technology applications.

Keywords

spin current spin waves magnetic nanoparticles

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@article{arxiv.0807.4660,
  title  = {Spin-Torque-Induced Rotational Dynamics of a Magnetic Vortex Dipole},
  author = {G. Finocchio and O. Ozatay and L. Torres and R. A. Buhrman and D. C. Ralph and B. Azzerboni},
  journal= {arXiv preprint arXiv:0807.4660},
  year   = {2009}
}

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19 pages, 4 figures,

Spin-Torque-Induced Rotational Dynamics of a Magnetic Vortex Dipole

Abstract

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