Abstract
We have investigated the magnetic states and magnetization process in sub-micron cup-shaped magnetic dots that consist of magnetic circular layers and magnetic ring layers. Ni-20 at% Fe cup-shaped dots with an outer diameter of 500 nm have vortical magnetic configurations at zero magnetic fields to reduce magnetostatic energy, while Co-17 at% Pt cup-shaped dots show the unidirectional magnetic configurations. Results of micromagnetics simulation show that the vortex-nucleation field of the Ni-20 at% Fe cup-shaped dots is positive, however, it is lower than that of the ordinary ring dots because the magnetic circular layers of the cup-shaped dots introduce vortex cores into themselves.
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