Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

Dynamics of two types of chiral magnetic domain walls in magnetic cylindrical nanowires under spin-polarised current are investigated by means of micromagnetic simulations. We show that Bloch point domain wall with chirality identical to that of the Oersted field can propagate without dynamical instabilities with velocities ca. 300 m/s. Domain wall width is shown to widen for a larger current density which limits the velocity increase. For domain walls with opposite chirality, we observed a new pinning mechanism created by the action of the Oersted field and limiting their propagation distance even after chirality switching. Vortex-antivortex domain walls transform into Bloch point domain wall, after which they can unexpectedly propagate either along or against the current direction. Our results demonstrate that domain wall dynamics under current in cylindrical magnetic nanowires can result in a plethora of different behaviors which will have important implications for future 3D spintronic devices.