Tuning vortex critical velocity in Mo2N thin films via striped magnetic domain configuration

G. BLATTER; M. SIRENA,; Y. LEE; JEEHOON KIM; N. HABERKORN

Physics Letters A

Elsevier

Año: 2024 vol. 494 p. 129284 - 129287

1873-2429

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 Mo2N 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.