  We report on the impact of the magnetic domain stripe configuration on the
critical velocity of vortices in superconducting/ferromagnetic bilayers. Using
a 23 nm thick Mo$_2$N film, covered by a 48 nm FePt layer with tunable
nanosized striped domains, we demonstrate that flux instability at low magnetic
fields depends on the orientation of the stripes. When the stripes are
perpendicular to the applied current and act as vortex guides, the velocity
values reach 5 km/s, duplicating those found when configured parallel to the
current, creating winding vortex paths. Our results indicate that vortex
critical velocities can be tuned by configuring different domain structures,
providing a platform to understand vortex dynamics in superconducting
microstrips.
