Spin torque and critical currents for magnetic vortex nano-oscillator in nanopillars

We calculated the main dynamic parameters of the spin polarized current induced magnetic vortex oscillations in nanopillars, such as the range of current density, where vortex steady oscillations exist, the oscillation frequency and orbit radius. We accounted for both the non-linear vortex frequency...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-04, Vol.292 (1), p.012006-5
Main Authors: Guslienko, K Y, Aranda, G R, Gonzalez, J
Format: Article
Language:English
Subjects:
Damping
Fluid flow
Magnetic saturation
Mathematical models
Nanostructure
Nonlinearity
Oscillations
Physics
Saturation (magnetic)
Spin dynamics
Vortices
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Summary:We calculated the main dynamic parameters of the spin polarized current induced magnetic vortex oscillations in nanopillars, such as the range of current density, where vortex steady oscillations exist, the oscillation frequency and orbit radius. We accounted for both the non-linear vortex frequency and non-linear vortex damping. To describe the vortex excitations by the spin polarized current we used a generalized Thiele approach to motion of the vortex core as a collective coordinate. All the calculation results are represented via the free layer sizes, saturation magnetization, and the Gilbert damping. Predictions of the developed model can be checked experimentally.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/292/1/012006