A double DC-SQUID device for flux locked loop operation

Author

Foglietti, V. ; Giannini, M.E. ; Petrocco, G.

Author_Institution

IESS-CNR, Rome, Italy

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

2989

Lastpage

2992

Abstract

A novel double DC SQUID device has been developed. It consists of two SQUIDs in a cascade configuration with the same electrical parameters but with a different geometry. This structure makes the device particularly suitable for flux-locked-loop operation without need for modulation flux. Consequently the readout electronic scheme is greatly simplified without degrading the noise performance of the first stage. The first DC SQUID has a gradiometer configuration with extra damping resistors shunting the inductance. The technology used is similar to the seven-layer IBM process with planar Nb-Nb₂O ₅-PbAuIn junctions and 2.5-μm minimum size lithography

Keywords

SQUIDs; flux flow; gold alloys; indium alloys; lead alloys; magnetometers; niobium; niobium compounds; 2.5 micron; Nb-Nb₂O₅-PbAuIn; cascade configuration; damping resistors; double DC-SQUID device; electrical parameters; flux locked loop operation; geometry; gradiometer configuration; minimum size lithography; noise performance; readout electronic scheme; seven-layer IBM process; Crosstalk; Damping; Degradation; Geometry; Inductance; Resistors; Resonance; SQUIDs; Superconducting device noise; Superconducting materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133839

Filename

133839