Effect of crystalline defects on domain wall motion under field and current in nanowires with perpendicular magnetization

In this work, we present a micromagnetic study of a magnetic domain wall dynamics influenced by magnetic fields and/or spin-polarized currents in systems characterized by perpendicular magnetization including crystalline defects. The dynamics in two different systems is studied: one showing the effect of defects in the flow regime, and the second one presenting the thermally activated depinning from a single defect. In the latter case, the thermal depinning can be analyzed within the framework of a single energy barrier process. In such situation, the current density can be assimilated to an applied field. We found that the energy barrier depends linearly on the applied field and on the injected current.