Abstract
We report the performance of twenty-four high temperature superconducting dc superconducting quantum interference devices (SQUIDs) whose Josephson junctions were formed from a YBa2Cu3O7-x (YBCO) grain boundary on an engineered MgO step-edge substrate. Each device has the same SQUID design with an inductance of 65 pH, and consisted of two SQUIDs with different junction widths, connected in series, and directly coupled to a large pick-up loop of 7.5 mm × 8.8 mm on a 1 × 1 cm2 chip. 58% of the devices had a peak-to-peak modulation voltage, ΔV, larger than 30 μV. The typical values of the white flux and field noise were 4.7 μΦo and 56 fT/Hz, respectively, in a magnetically shielded environment with 1/f corner frequency at 15–20 Hz. In an unshielded environment, there was no degradation of white noise.
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