The evolution of a magnetic "vortex" state in submicron ferromagnetic
disks has been studied as functions of disk diameter and thickness.
The vortex core displacement in the applied magnetic field was calculated
by minimizing the total magnetic energy consisting of the magnetostatic,
exchange, and Zeeman energies. A simple analytical expression for
the initial magnetic susceptibility is deduced. The initial susceptibility
increases with increasing disk diameter and decreasing thickness.
The calculations agree well with the experimental data obtained for
the 60 nm thick permalloy disk arrays with a variable diameter from
0.2 to 0.8 μm. © 2001 American Institute of Physics.
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