Abstract
Periodic oscillations in the V-Φ characteristics have been observed up to 97 K in radio frequency SQUIDs fabricated from screen printed Bi-Sr-Ca-Cu-O thick films. The SQUID has been operated successfully in the flux-locked-loop mode at 77 K. Stability of the SQUID output and its noise performance have been found to improve considerably when the SQUID is operated in the flux-locked-loop mode as compared to that in the open-loop mode. The spectral noise density, in the white noise region, is 5×10−4 Φ0/√Hz at 77 K for the flux-locked-loop mode.
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