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The magnetic vortex structure, that is present in several nanoscopic systems,is stable and can be manipulated through the application of a magnetic field ora spin polarized current. The size and shape of the core are strongly affectedby the anisotropy, however its role on the core behavior has not yet beenclarified. In the present work we investigate the influence of a perpendicularanisotropy on the annihilation and shape of magnetic vortex cores in permalloydisks. We have used both micromagnetic simulations with the OOMMF code, and ananalytical model that assumes that the shape of the core does not change duringthe hysteresis cycle, known as the rigid core model, to calculate theannihilation fields. In both cases we found that the annihilation fieldsdecrease with increasing perpendicular anisotropy for almost all the structuresinvestigated. The simulations show that for increasing anisotropy or dotthickness, or both, the vortex core profile changes its shape, becomingelongated. For every dot thickness, this change does not depend on the dotradius, but on the relative distance of the core from the center of the dot.

Effect of perpendicular uniaxial anisotropy on the annihilation fields of magnetic vortices