Title :
A double DC-SQUID device for flux locked loop operation
Author :
Foglietti, V. ; Giannini, M.E. ; Petrocco, G.
Author_Institution :
IESS-CNR, Rome, Italy
fDate :
3/1/1991 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
