Calculation, fabrication and investigation of thin-film Josephson interferometers

The calculation of n-junction SQUID characteristics is simplified and other methods of calculation of SQUID are proposed. The effectiveness of SQUID self-shielding is shown. The magnetometer which is made on such nonshunted SQUIDs has flux resolution 3×10 -3 φ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> x Hz -1/2 . A process for SQUID fabrication is based on the use of Nb-NbO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</inf> -Pb(Bi) Josephson junction with <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Rj/RN≥18</tex> , Nb ground plane, Al <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> O <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> insulated films, ion cleaning. Tunnel spectroscopy studies have indicated the correlation between oxide composition and oxidation temperature.