Abstract
Thin film Nb-(fine Nb wires)-NbN dc-superconducting quantum interference devices (SQUIDs) with well-balanced critical current have been reproducibly fabricated by applying an electric field simultaneously to two insulating Nb/MgO/NbN edge-sandwiches (each junction area=0.2 μm2) in a superconducting loop, in liquid helium. Although the critical current of a dc-SQUID is not yet controlled sufficiently, this fabrication technique is well suited to use in short weak link dc-SQUIDs, thanks to the reproducibility of dc-SQUIDs with well-balanced critical current, the simplicity of fabrication processes, and the large device resistance.
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