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Multiple ferromagnetic resonance in mesoscopic permalloy rings
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Dispersion of the unpatterned permalloy film deposited together with the rings. Symbols: measured values; line: fit according to the Kittel formula (parameters are shown in the figure). (b) An atomic force micrograph of the waveguide center with the integrated ring array . Light areas are gold, dark areas are the GaAs substrate. The center conductor is wide. (c) A sketch of the coplanar waveguide with contact pads for microwave probes. The ground (outer lines) and signal lines are made of thermally evaporated gold with chromium as adhesion layer.

Image of FIG. 2.
FIG. 2.

For all panels: Left: experimental dispersion, Right: raw data at a magnetic field of . Inset: scanning electron micrograph of a single microstructure of the array. Note the different number and dispersion of modes. Broken lines in all panels show the dispersion of the uniform precession mode of the plain permalloy film from Fig. 1 for comparison.

Image of FIG. 3.
FIG. 3.

(a) Frequencies of the FMR modes at as a function of width . The broken horizontal line indicates the frequency of the uniform precession of the unpatterned film for comparison. Lines connecting data points are guides to the eye. (b) Calculated equilibrium spin configuration, , (c) and (d) absolute value of the internal field in a and ring, respectively. White encodes large magnitude, black encodes zero. All results of micromagnetic simulations are for which was oriented as indicated.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multiple ferromagnetic resonance in mesoscopic permalloy rings