Thin-film dc SQUID with low noise and drift

Journal Article · Fri Aug 01 00:00:00 EDT 1975 · Appl. Phys. Lett., v. 27, no. 3, pp. 155-156

DOI:https://doi.org/10.1063/1.88391· OSTI ID:4169869

Clarke, J; Goubau, W M; Ketchen, M B

The fabrication and operation of thin-film dc SQUID's of cylindrical geometry that make use of shunted Nb-NbO/sub x/-Pb tunnel junctions are described. A typical noise power spectrum is shown. At frequencies between 2 x 10$sup -2$ Hz and the electronic roll-off frequency, the flux resolution is 3.5 x 10$sup -5$ phi/sub 0//(Hz)/sup $sup 1$$/$$sub 2$/, corresponding to a magnetic field resolution of 10$sup -10$ G/(Hz)/sup $sup 1$$/$$sub 2$/. This resolution appears to be set by intrinsic sensor noise. Below 2 x 10$sup 2$ Hz, the spectrum is approximately 1/f. A 20-h plot of SQUID output as a function of time demonstrates an average drift of less than 2 x 10$sup -5$ phi/sub 0//h. (auth)

• Research Organization: Univ. of California, Berkeley
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-000529
• OSTI ID: 4169869
• Journal Information: Appl. Phys. Lett., v. 27, no. 3, pp. 155-156, Journal Name: Appl. Phys. Lett., v. 27, no. 3, pp. 155-156; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

*MAGNETOMETERS-- SQUID DEVICES
*SQUID DEVICES-- PERFORMANCE
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OPERATION