Abstract
We report planar-type MgB2 DC SQUIDs fabricated using a multilayer process. The SQUIDs employed sandwich-type MgB2/MgO/MgB2 Josephson junctions and a MgB2 wiring layer. The SQUIDs showed large voltage modulation above 500 μV at 15 K and operated in a broad temperature range from 15 to 37 K with a transfer function as high as 2.3 mV/Φ0. The minimum SQUID noise was measured at 26 K in a cryocooler, yielding a white noise around 10 μΦ0/Hz1/2 and 1/f corner frequency near 10 Hz. The result demonstrates great promise of MgB2 SQUIDs for practical applications.
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