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Determination of the Parameters of High-T C RF SQUID from Its Small Signal Voltage-Frequency Characteristics

Determination of the Parameters of High-T C RF SQUID from Its Small Signal Voltage-Frequency... The present study is the extension of a recent theory of high-TC RF SQUIDs, operating in the presence of large thermal fluctuations. First, the explicit analytical expressions for the amplitudes of higher harmonics of the current circulating in a SQUID loop which are necessary for the determination of the junction critical current IC and the inductive coupling coefficient of the SQUID loop to its tank circuit, k2 , are found. Second, in order to find the junction resistance R with acceptable accuracy, the solution of Fokker–Plank equation to first order in parameter q = ωL/R, where ω is a bias frequency, L is a loop inductance, is obtained. These results allow one to derive the simple expressions for the determination of the junction critical current IC, its normal resistance R, and the inductive coupling coefficient of the SQUID loop to its tank circuit, k2 , from the experimental measured small signal voltage-frequency characteristics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Determination of the Parameters of High-T C RF SQUID from Its Small Signal Voltage-Frequency Characteristics

Greenberg, Ya.
Journal of Low Temperature Physics , Volume 114 (4) – Oct 14, 2004
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References (3)

Publisher
Springer Journals
Copyright
Copyright © 1999 by Plenum Publishing Corporation
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1023/A:1022528300952
Publisher site
See Article on Publisher Site

Abstract

The present study is the extension of a recent theory of high-TC RF SQUIDs, operating in the presence of large thermal fluctuations. First, the explicit analytical expressions for the amplitudes of higher harmonics of the current circulating in a SQUID loop which are necessary for the determination of the junction critical current IC and the inductive coupling coefficient of the SQUID loop to its tank circuit, k2 , are found. Second, in order to find the junction resistance R with acceptable accuracy, the solution of Fokker–Plank equation to first order in parameter q = ωL/R, where ω is a bias frequency, L is a loop inductance, is obtained. These results allow one to derive the simple expressions for the determination of the junction critical current IC, its normal resistance R, and the inductive coupling coefficient of the SQUID loop to its tank circuit, k2 , from the experimental measured small signal voltage-frequency characteristics.

Journal

Journal of Low Temperature Physics – Springer Journals

Published: Oct 14, 2004

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