Large and uniform critical currents in finite magnetic fields

Loss-free superconducting transport is tremendously important for technological and energy applications. Heat dissipation from drifting magnetic vortices is one of the main limiting factors for superconductors usage. Here we discuss defect configurations that trap vortices almost independently of their direction. As a result, such pinning configurations produce near uniform critical current as a function of applied magnetic field angle. To cover the broadest class of pinning landscapes we employ a genetic algorithm varying the size, position, and orientation of each defect individually. We report several notable results and analyse them in details. The highest uniform critical current is 22% of the depairing current at the magnetic field 10% of the second critical field.