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Hertel, R., Kirschner, J.

Resonant modes of vortex structures in soft-magnetic nanodiscs
Journal of Magnetism and Magnetic Materials 272-276, (Part 1),pp 655-656 (2004)
We present micromagnetic finite-element simulations on the dynamic response of a soft-magnetic disc exposed to an oscillatory field applied in the disc plane. The disc is magnetized in a vortex state. At lower frequencies (about 200 MHz in our example) we find a motion of the vortex core on an elliptical orbit as a resonant mode. At higher frequencies, the out-of-plane component of the magnetization becomes resonant by the excitation of standing magnetostatic waves.