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

Tuning vortex critical velocity in Mo$_2$N thin films via striped magnetic domain configuration