Abstract
Superconducting quantum interference filters (SQIFs) are arrays of superconducting loops, with Josephson junctions, of diverse loop sizes. The dependence of the SQIF voltage on external magnetic fields is non-periodic and shows only one unique peak at zero field. We present several kinds of SQIFs—serial arrays, parallel arrays and various combinations of both—which are all realized with high-Tc superconductors. Compared to a single SQUID all SQIF types show improved magnetic field sensitivity and noise-limited field resolution. In order to realize really sensitive magnetometers the SQIFs were coupled to pickup coils. Consequently, the sensitivity and noise of the SQIF-based magnetometers are comparable with that of their SQUID-based counterparts. For a flip-chip configuration using a serial–parallel SQIF and a superconducting flux transformer, a noise-limited field resolution of 70 fT Hz−1/2 was achieved. This is only twice the value of that using a normal SQUID. Further reduction should be possible by a better adaptation of the complete design to the SQIF options.
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