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Finite Size Effect on Spread of Resonance Frequencies in Arrays of Coupled Vortices

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5 Author(s)
Andreas Vogel$^{1}$Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung,, Universität Hamburg,, Hamburg,, Germany ; AndrĂ© Drews ; Mi-Young Im ; Peter Fischer
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Dynamical properties of magnetic vortices in arrays of magnetostatically coupled ferromagnetic disks are studied by means of a broadband ferromagnetic-resonance (FMR) setup. Magnetic force microscopy and magnetic transmission soft X-ray microscopy are used to image the core polarizations and the chiralities which are both found to be randomly distributed. The resonance frequency of vortex-core motion strongly depends on the magnetostatic coupling between the disks. The parameter describing the relative broadening of the absorption peak observed in the FMR transmission spectra for a given normalized center-to-center distance between the elements is shown to depend on the size of the array.

Published in:

IEEE Transactions on Magnetics  (Volume:47 ,  Issue: 6 )