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Magnetic Vortex Core Dynamics in a Ferromagnetic Dot

K. Yu. Guslienko·X. F. Han·D. J. Keavney·R. Divan·S. D. Bader
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Abstract

We report direct imaging by means of x-ray photoemission electron microscopy of the dynamics of magnetic vortices confined in micron-size circular Permalloy dots that are 30 nm thick. The vortex core positions oscillate on a 10-ns timescale in a self-induced magnetostatic potential well after the in-plane magnetic field is turned off. The measured oscillation frequencies as a function of the aspect ratio (thickness/radius) of the dots are in agreement with theoretical calculations presented for the same geometry.

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K. Yu. Guslienko, X. F. Han, D. J. Keavney, R. Divan, S. D. Bader. 2005-10-21. Magnetic Vortex Core Dynamics in a Ferromagnetic Dot. https://doi.org/10.1103/physrevlett.96.067205

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