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An HTS SQUID picovoltmeter with a flip-chip flux transformer

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3 Author(s)
Blomgren, J. ; Dept. of Microelectron. & Nanosci., Chalmers Univ. of Technol., Goteborg, Sweden ; Eriksson, T. ; Winkler, D.

An HTS SQUID picovoltmeter was constructed, which in two different configurations gave a voltage noise of en=3.2pV/√Hz and a current noise of in=310 pA/√Hz, and a voltage noise of en=75 pV/√Hz and a current noise of in=10 pA/√Hz, respectively. The low frequency noise was reduced to below 1 Hz using bias current reversal. The SQUID is coupled to the input coil via an intermediate flip-chip flux transformer. Measurements were performed to determine the input coil to SQUID mutual inductance for different input coil configurations

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )