Spin-Torque-Induced Rotational Dynamics of a Magnetic Vortex Dipole
arXiv:0807.4660 · doi:10.1103/PhysRevB.78.174408
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.
19 pages, 4 figures,
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Cited by in corpus (12)
- Spin transfer nano-oscillators
- Micromagnetic understanding of stochastic resonance driven by spin-transfertorque
- Spin-torque driven magnetization dynamics in a nanocontact setup for low external fields: numerical simulation study
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