Abstract
Early practical SQUID sensors have used point contact junctions. Ultimately all thin-film SQUIDs are desirable to permit integration of superconductive electronic circuitry. We report on hybrid D.C. SQUIDs using Nb/αSi/Nb thin film junctions and a toroidal canister. SQUIDs having white flux noise levels of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10^{-5}\phi_{0}/\sqrt{Hz}</tex> are routinely produced.
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