Critical current from surface barriers in type-II superconducting strips

Extending a model we previously used to calculate magnetization hysteresis arising from the geometrical barrier in a flat, bulk-pinning-free type-II superconducting strip subjected to a perpendicular magnetic field Hₐ, we here calculate the contribution, arising from screening currents on the top and bottom surfaces, to the magnetic-field-dependent critical current Ic(Hₐ) due to surface barriers, including both the geometrical barrier and the Bean-Livingston barrier.