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Physica C Superconductivity

YBCO thin film rf-SQUID using bicrystal junction

Neeraj Khare

Published Feb 1, 1999• 2 citations
Publisher
DOI
10.1016/s0921-4534(98)00693-5

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In this work, various methods of improving the performance and yield of our step-edge junction rf SQUIDs are described. These methods include adjusting the YBCO thin film thickness and trimming of the device parameters by ion beam etching and heat annealing. Significant improvement in SQUID performance and yield was demonstrated by employing these techniques. The effects of passivation of the rf SQUIDs by ex-situ deposition of an amorphous-YBCO thin film were also studied. No adverse effects were observed for the noise performance of the devices due to passivation and long-term stability was obtained.
We report the successful realization of a resistively shunted two-junction high temperature superconducting (HTS) SQUID in which the heterodyne signal generated between the two YBCO grain-boundary junctions is accurately controlled in the range of 1–50 MHz by adjustment of the bias current in the milliampere range through a thin-film on-chip YBCO-Au-YBCO shunt resistor (∼25 μΩ). Oscillations in the temperature range 20–60 K and signal powers up to 2 nW in a 20 kHz bandwidth have been recorded.