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

TL;DR

This paper investigates vortex dynamics in ferromagnetic dots, deriving susceptibility and relaxation properties, and introduces a new method to extract damping parameters from resonance data.

Contribution

It presents a novel approach to analyze vortex dynamics in mesoscopic ferromagnetic dots and proposes a new method for damping parameter extraction from resonance peaks.

Findings

Calculated susceptibility and linewidth dependencies on geometry.

Developed a new damping extraction method.

Applied method to FeNi circular dots resonance data.

Abstract

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.