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Related Experiment Videos

Micromagnetic dissipation, dispersion, and mode conversion in thin permalloy platelets.

M Buess1, T Haug, M R Scheinfein

  • 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93040 Regensburg, Germany.

Physical Review Letters
|May 21, 2005
PubMed
Summary

Ferromagnetic Permalloy disks show distinct azimuthal and axial modes when excited by magnetic pulses. Azimuthal modes damp faster than axial modes, indicating mode conversion and coupling.

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Area of Science:

  • * Physics, Materials Science, and Nanotechnology.
  • * Focus on condensed matter physics and magnetism.

Background:

  • * Micron-sized ferromagnetic Permalloy disks possess an in-plane ferromagnetic vortex structure.
  • * Understanding the dynamics of these structures is crucial for applications in magnetic data storage and spintronics.

Purpose of the Study:

  • * To investigate the modal structure and dynamic behavior of ferromagnetic Permalloy disks.
  • * To analyze the time dependence and damping rates of different vibrational modes.

Main Methods:

  • * Excitation of Permalloy disks using a fast-rise-time perpendicular magnetic field pulse.
  • * Analysis of the resulting modal structure using Fourier filtering techniques.
  • * Separation and individual time-dependence analysis of azimuthal and axial modes.

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Main Results:

  • * Identification of both azimuthal and axial modes in the excited Permalloy disks.
  • * Experimental data reveals that azimuthal modes exhibit faster damping compared to axial modes.
  • * Observed mode damping suggests a conversion from low-frequency azimuthal modes to a higher-frequency fundamental mode.

Conclusions:

  • * The observed damping differences are interpreted as mode-mode coupling.
  • * This coupling occurs within a system characterized by a single Landau-Lifshitz-Gilbert damping constant (alpha).
  • * The findings contribute to a deeper understanding of spin wave dynamics in magnetic nanostructures.