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Low-inductance superconducting quantum interferometer with two microbridge junctions

K. B. Lobanov, С. И. Бондаренко, A. G. Davydova, V.B. Bondarev

Published Nov 1, 1976• 0 citations
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Abstract

A detailed description of the design, fabrication, and characteristics of a SQUID interferometer is given. Superconducting Nb films are employed. (AIP)

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Nano-SQUIDs which can be the readout for inductive superconducting transition edge detectors (ISTED) were fabricated on monolayer niobium (Nb) film by focus ion beam (FIB) milling. The dimension of the nanobridges which formed the junctions was less than 60 nm and the diameter of the loop was 20 μm, The properties of this nano-SQUID were investigated. The design of ISTED was introduced and the transition temperature (Tc) of the absorbing layer was adjusted by both the thickness and the proportion Si doping of Nb.
The Superconducting Low-inductance Undulatory Galvonometer (SLUG) microwave amplifier is distinct from a conventional SQUID amplifier in that the signal to be amplified is directly injected into the SQUID loop, allowing high frequency operation. Here, we discuss a planar SLUG amplifier constructed with nanobridge weak-links fabricated from a single niobium layer. DC characterisation of the SLUG gain element is presented for two nanobridge fabrication techniques. Measurements show that junctions fabricated from Ne focused-ion-beam, and from 100 keV electron-beam lithography, have significantly different DC characteristics with critical currents on the order of 100 μA and 1mA respectively. Both variants exhibit maximum forward transfer functions greater than 1.5 mV/Φ0, which is larger than those reported in Nb SIS-junction SLUGs. Theoretical modelling has shown that an amplifier containing a planar, nanobridge SLUG as a gain element is expected to exhibit gain exceeding 15 dB with large instantaneous bandwidth, and can be designed to operate well in excess of 20 GHz.