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Spin-torque driven magnetic vortex self-oscillations in perpendicular magnetic fields
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) experimental differential resistance (top) and simulated magnetoresistance (bottom) vs out-of-plane field. (b) frequency of the vortex self-oscillation as function of current density for different model parameters. The functional dependence are simulated with the spin transfer exerted on the top section only: , 300 K , and . (c) Temporal evolution of the x and y component of the average normalized magnetization for , and (d) projection of the trajectory in the plane.

Image of FIG. 2.
FIG. 2.

(a) spatial positions of the vortex core during its dynamics for two values of current densities (“”) and (“o”). (b) two snapshots of the vortex core position (the grayscale represents the amplitude of the z-component of the magnetization). (c) corresponding snapshots of the thinner Py-layer magnetization during the vortex dynamics in the thicker Py-layer. The arrows indicate the in-plane magnetization direction.

Image of FIG. 3.
FIG. 3.

Main panel: spectra of the y-component of the magnetization computed by means of the micromagnetic spectral mapping technique for (larger power maximum) and . Inset: Comparison between numerical and experimental data reported in Fig. 1(b) of Ref. 8.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spin-torque driven magnetic vortex self-oscillations in perpendicular magnetic fields