Low-frequency vortex dynamic susceptibility and relaxation in mesoscopic ferromagnetic dots

Details Low-frequency vortex dynamic susceptibility and relaxation in mesoscopic ferromagnetic dots Low-frequency vortex dynamic susceptibility and relaxation in mesoscopic ferromagnetic dots

2006-02-10

arxiv.org/abs/cond-mat/0602279v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.2221904

Vortex dynamics in a restricted geometry is considered for a magnetic system consisting of ferromagnetic cylindrical dots. To describe the vortex dynamic susceptibility and relaxation the equation of motion for the vortex center position is applied. The dependencies of the vortex dynamic susceptibility and resonance linewidth on geometrical parameters are calculated. A new method of extracting damping parameter from the vortex low-frequency resonance peaks is proposed and applied for interpretation of resonance data on FeNi circular dots.

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