The switching of a vortex core of a single disk in an array of a multilayersystem is investigated by micromagnetic simulation. We found that theperpendicular uniaxial anisotropy (PUA) decreases the frequencies of theazimuthal mode in disks with magnetic vortex configuration. We obtained a phasediagram of magnetic field intensity vs. frequency of the azimuthal mode, as afunction of the value of perpendicular uniaxial anisotropy. We demonstratedthat rotating magnetic fields (CW and CCW) with frequency equal to azimuthalmodes can be used to switch the vortex core of single disks in a disk array.This allows obtaining different memory states with a single array of nanodisks,and therefore writing information through the application of rotating fields.
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