NDLI: Integrated dc SQUID Magnetometers in Multichannel Systems for Biomagnetic Imaging

Content Provider	IEEE Xplore Digital Library
Author	Granata, C. Vettoliere, A. Russo, M.
Copyright Year	2007
Description	Author affiliation: Ist. di Cibernetica "E. Caianiello" del Consiglio Nazionale delle Ricerche, Pozzuoli (Granata, C.; Vettoliere, A.; Russo, M.)
Abstract	Improved design and reliable procedures to fabricate low noise superconducting quantum interference device (SQUID) magnetometers, based on niobium technology, have been developed. An improvement in magnetometer performances has been achieved by increasing the flux capture area of the pick-up coil loop together with a much higher SQUID inductance, in order to increase the mutual inductance between the input coil and the washer. In such a way an effective area of 3 $mm^{2},$ corresponding to a field-to-flux conversion efficiency of 0.7 $nT/Phi_{0}$ has been obtained. In order to reduce the cross-talk in systems consisting of a large number of SQUIDs a new feedback coil design has been developed. Furthermore a full additional positive feedback (APF) circuit has been integrated on the same chip together with a feedback coil for flux-locked-loop (FLL) operations. Such devices exhibit a magnetic field sensitivity as low as 1.5 $fT/Hz^{1/2}$ in white noise region. The temperature dependence of sensor sensitivity is also reported. The measurements show a slow increasing of the field noise up to temperatures of about 5 K, giving a considerable tolerance of the working temperature of niobium magnetometers assembled in vacuum as in some innovative multichannel systems for magnetoencephalography. Due to their compactness and good performances, such devices well meet the requirements of large multichannel systems for biomagnetic imaging.
Starting Page	556
Ending Page	563
File Size	2096188
Page Count	8
File Format	PDF
ISBN	9781424408122
DOI	10.1109/EURCON.2007.4400594
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-09
Publisher Place	Poland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	SQUID magnetometers Biomagnetics Superconducting device noise Superconducting coils Temperature sensors Crosstalk Niobium Inductance Magnetic field measurement Superconducting devices Magnetometer Josephson devices SQUID
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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