Abstract
Radiofrequency-SQUID (superconducting quantum interference device) sensors have been fabricated using natural grain boundary weak-links in high- Br - Sr - Ca - Cu - O screen printed thick films. The films have predominantly high- 2223 phase and are c-axis oriented with large size grains ( - ) and of 104 K. These sensors showed good voltage - flux (V - ) characteristics at 77 K. The rf-SQUIDs have been operated in the flux-locked-loop mode at 77 K and showed a flux noise density in the white noise region. The potential of these SQUIDs in non-destructive detection of defects in steel plates has been demonstrated.
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