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Thermo-magnetic instability (TMI) in superconductors is known to destroy thecritical state via magnetic flux avalanches, and hence it deteriorates theability of the superconductors to shield external magnetic field. In this work,we quantify to what extent the shielding current is affected by TMI. We recoverthe critical state in one half of a thermo-magnetically unstable NbN film bycoating it with a thin layer of Cu. Suppression of the instability in the metalcoated part is confirmed by the results of a direct real time magneto-opticalimaging. A pattern of discontinuity lines in the observed flux distributionindicates that only one quarter of the shielding current flows through thewhole sample, including the unstable uncoated part, while three quarters flowin loops within the stable Cu-coated part.

Suppression of magnetic flux avalanches and recovery of the critical state in superconducting NbN films