Abstract
Superconducting quantum interference filters (SQIFs) are arrays of superconductingloops, with Josephson junctions, with different sizes of loops. This produces adelta-like unique peak at zero fields in the voltage–magnetic field characteristics.This paper summarizes the status of the attempts to use SQIFs, realized withhigh-Tc superconductors, for sensitive magnetometers. Rules are given for how the SQIF itself has to be set up andhow high-Tc technology hurdles have to be considered. After revising the most simple layoutsof magnetometers, using only one single superconducting layer, a way is shownto exploit the SQIF power in a flip-chip layout with a flux transformer. Sucha magnetometer is described. A noise-limited magnetic field resolution of65 fT Hz−1/2 is achieved. Ways toward further improvement are sketched out.
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