Abstract
Superconducting quantum interference filters (SQIFs) are arrays of superconducting quantum interference devices with various loop areas. In contrast to the SQIFs of conventional Josephson junctions, we propose a way for creating highly integrated SQIFs using 50 × 50 nm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> three-dimensional (3-D) nanobridge junctions. Here, we report the fabrication of arrays composed of a hundred 3-D nanobridge junctions. Current-voltage curves of single, 10, and 100 junctions in series were measured and analyzed. Measurements of single junctions revealed an average critical current of 104 μA with a standard deviation of 24 μA. Furthermore, the 10 junctions in series had randomly distributed switching events. The normal resistance as the function of the number of junctions in series showed a good linearity, indicating a good uniformity of the junctions. Therefore, we propose that the local differences in the thermal-dissipation conditions and random trapped vortices were likely responsible for the random switching of the nanobridge junctions in series.
Published Version
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