A double dc SQUID based magnetometer

A double dc SQUID based magnetometer

We have developed a double dc SQUID based magnetometer with a direct read-out circuit and measured its signal and noise characteristics. The inductances of the input SQUID and SQUID-preamplifier were 120 and 250 pH. Thin-film flux transformers on the separate substrates had an inductance of the orde...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity Vol. 5; no. 2; pp. 3241 - 3243
Main Authors: Maslennikov, Yu.V., Baljaev, A.V., Snigirev, O.V., Kaplunenko, O.V., Mezzena, R.
Format: Journal Article
Language:English
Published: IEEE 01-06-1995
Subjects:
Circuit noise
Dynamic range
Energy resolution
Inductance
Magnetic circuits
Noise measurement
SQUID magnetometers
Substrates
Thin film circuits
Transformers
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Summary:We have developed a double dc SQUID based magnetometer with a direct read-out circuit and measured its signal and noise characteristics. The inductances of the input SQUID and SQUID-preamplifier were 120 and 250 pH. Thin-film flux transformers on the separate substrates had an inductance of the order of 1 /spl mu/H each and a current sensitivity of 0.54 and 0.32 /spl mu/A//spl Phi//sub 0/ for the first and the second SQUIDs, respectively. The intrinsic energy resolution of the fabricated magnetometer for an optimal gain of 58 for the first stage was close to 1.6/spl times/10/sup -32/ J/Hz. The dynamic range and the slew rate were about 126 dB and 4/spl times/10/sup 4/ /spl Phi//sub 0//s.< >
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ISSN:1051-8223
1558-2515
DOI:10.1109/77.403282