Curved geometrical confinement effect on vortex-state reversals in magnetic half-spheres

Abstract

We applied micromagnetic numerical calculations to a study of vortex-state reversal dynamics in half-spheres. We found an additional, heretofore unknown mechanism of vortex-core reversals that occur via the nucleation of a reversed vortex core at the edge of the half-sphere after expulsion of the original core either with or without the reversal of the original chirality, but without formation of the magnetization dip or Bloch point. The vortex-state reversals are affected by the curved geometrical confinement of the half-spheres. Detailed descriptions of the reversal dynamics offer the fundamentals of both vortex polarization and chirality reversals in curved restricted geometries.