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Vortex dynamics in patterned ferromagnetic ellipses
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View: Figures


Image of FIG. 1.
FIG. 1.

MFM images (sample B) show that the ellipses are found mainly in a two-vortex state after saturating along the long axis (scale [0,1.3]). The insets show the one- and two-vortex simulated magnetization distributions.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Representative impedance derivative spectra (real part) obtained for an in-plane field of applied along the long axis of sample B. The lowest frequency peak is associated with a single-vortex state (solid), whereas two higher frequency peaks are observed for the vortex pair (dashed). The inset shows an optical microscope image of the sample. (b) The experimental (solid) and simulated (open) resonance frequencies as a function of ellipse aspect ratio and corresponding linear fits (dotted and dashed lines, respectively) and analytical calculation according to Eq. (2) (solid line) with . The dot parameters are , 2.1, and , , 1.2, and , and . The inset shows the measured frequencies vs for the vortex pairs with linear fits through zero.

Image of FIG. 3.
FIG. 3.

Simulations of single-vortex dynamics in an ellipse. The magnetization is shown as a function of time for a ellipse, thick after a perturbation of along . The inset shows the core trajectory.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vortex dynamics in patterned ferromagnetic ellipses