1997•Japanese Journal of Applied PhysicsOpen access

Design, Fabrication and Evaluation of a Four-Josephson-Junction Superconducting Quantum Interference Device with Two Superconducting Loops

T. Morooka

Abstract

We developed a four-Josephson-junction superconducting quantum interference device (4JJ-SQUID) with a large modulated voltage to realize a highly sensitive magnetic sensor. This letter describes the design and fabrication, and discusses the potential and the performance of the 4JJ-SQUID. The 4JJ-SQUID was fabricated using Nb/Al–AlO x /Nb tunnel junctions. The SQUID consists of two pairs of Josephson junctions that form two superconducting loops via a shared washer coil. We confirmed using both calculation and experiment that the SQUID had a higher magnetic sensitivity than that of a conventional DC-SQUID.

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Available abstract

Key concepts: Squid, Josephson effect, Scanning SQUID microscopy, Superconducting tunnel junction, Superconductivity, Fabrication, Pi Josephson junction, Condensed matter physics