Micromagnetic Dissipation, Dispersion, and Mode Conversion in Thin Permalloy Platelets

M. Buess, T. Haug, M. R. Scheinfein, and C. H. Back
Phys. Rev. Lett. 94, 127205 – Published 1 April 2005

Abstract

Micron-sized ferromagnetic Permalloy disks exhibiting an in-plane ferromagnetic vortex structure are excited by a fast rise time perpendicular magnetic field pulse and their modal structure is analyzed. We find azimuthal and axial modes. By a Fourier filtering technique we can separate and analyze the time dependence of individual modes. Analysis of the experimental data demonstrates that the azimuthal modes damp more quickly than the axial modes. We interpret these results as mode conversion from low-frequency azimuthal modes to the fundamental mode which is higher in frequency, i.e., mode-mode coupling in a system with a single Landau-Lifshitz-Gilbert phenomenological damping constant α.

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  • Received 8 November 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.127205

©2005 American Physical Society

Authors & Affiliations

M. Buess1,2, T. Haug1, M. R. Scheinfein3, and C. H. Back1

  • 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93040 Regensburg, Germany
  • 2Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland
  • 3Simon Fraser University, 8888 University Drive, Burnaby BC V5A 1S6, Canada

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Vol. 94, Iss. 12 — 1 April 2005

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