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Applications of Parallel Josephson Junction Arrays for the Detection of Magnetic Flux

Published online by Cambridge University Press:  26 February 2011

J. H. Miller Jr ,
G. H. Gunaratne ,
Z. Zou ,
J. Huang  and
T. D. Golding
J. H. Miller Jr
Affiliation:
University of Houston, Department of Physics, Texas Center for Superconductivity, and Space Vacuum Epitaxy Center, Houston, Texas 77204–5506
G. H. Gunaratne
Affiliation:
University of Houston, Department of Physics, Texas Center for Superconductivity, and Space Vacuum Epitaxy Center, Houston, Texas 77204–5506
Z. Zou
Affiliation:
University of Houston, Department of Physics, Texas Center for Superconductivity, and Space Vacuum Epitaxy Center, Houston, Texas 77204–5506
J. Huang
Affiliation:
University of Houston, Department of Physics, Texas Center for Superconductivity, and Space Vacuum Epitaxy Center, Houston, Texas 77204–5506
T. D. Golding
Affiliation:
University of Houston, Department of Physics, Texas Center for Superconductivity, and Space Vacuum Epitaxy Center, Houston, Texas 77204–5506
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Abstract

We have carried out finite-inductance calculations of the critical current vs, flux(Ic-φ) and voltage vs, flux (V-φ) characteristics of superconducting interferometers with many Josephson junctions (JJ's) in parallel. At least two features of our calculations suggest that interferometers with many junctions, which we call Superconducting QUantum Interference Gratings, or SQUIG's, might be advantageous for the detection of magnetic flux. First, the voltage noise can potentially be reduced significantly as compared to a dc SQUID with the same overall voltage-to-flux transfer coefficient - a feature which might reduce 1/f noise and enhance the magnetic flux sensitivity of both low and high Tc superconducting (HTS) devices. In addition, nonuniformity of the junction critical currents appears to have little adverse effect on the predicted diffraction-grating like enhancement and narrowing of the peaks in the Ic-φcharacteristic, suggesting that flux uniformity, rather that critical current uniformity, is of primary importance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 759
Copyright
Copyright © Materials Research Society 1992

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References

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