Abstract
The authors have constructed and tested high-T/sub c/ magnetometers by coupling a high-T/sub c/ thin-film superconducting quantum interference device (SQUID) to two different high-T/sub c/ thin-film flux transformers. The SQUID was made from Tl/sub 2/CaBa/sub 2/Cu/sub 2/O/sub 8+y/ films grown on MgO, with junctions consisting of native grain boundaries. The flux transformers were made from YBa/sub 2/Cu/sub 3/O/sub 7-x/, and each had ten-turn input coils and a single-turn pickup loop. The first transformer, which was patterned with a combination of shadow masks and photolithography, yielded a magnetic field gain of about -7.5, functioned up to 79 K, and gave a magnetic field sensitivity B/sub N/ (10 Hz) approximately= 3.1 pT Hz/sup -1/2/ at 38 K. The second transformer, which was patterned entirely by photolithography, yielded a gain of about -8.7 functioned up to 25 K, and had a sensitivity B/sub N/ (10 Hz) approximately=3.5 pT Hz/sup -1/2/ at 4.2 K. In both cases, the limiting noise arose in the SQUID.
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