High-[Formula Omitted] DC SQUIDs for Magnetoencephalography

We have investigated the microstructural and electron transport properties of 45[Formula Omitted] step-edge Josephson junctions grown on MgO substrates and used them for the preparation of superconducting quantum interference device (SQUID) magnetometers intended for magnetoencephalography (MEG) mea...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.1600705-1600705
Main Authors: Faley, M. I, Poppe, U, Dunin-Borkowski, R. E, Schiek, M, Boers, F, Chocholacs, H, Dammers, J, Eich, E, Shah, N. J, Ermakov, A. B, Slobodchikov, V. Y, Maslennikov, Y. V, Koshelets, V. P
Format: Article
Language:English
Subjects:
Direct current
Magnesium oxide
Magnetoencephalography
Magnetometers
NMR
Nuclear magnetic resonance
SQUIDs
Superconducting quantum interference devices
Superconductivity
Superconductors
Transformers
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Summary:We have investigated the microstructural and electron transport properties of 45[Formula Omitted] step-edge Josephson junctions grown on MgO substrates and used them for the preparation of superconducting quantum interference device (SQUID) magnetometers intended for magnetoencephalography (MEG) measurement systems. The high-[Formula Omitted] SQUID magnetometers also incorporate 16 mm multilayer superconducting flux transformers on the MgO substrates and demonstrate a magnetic field resolution of [Formula Omitted] at 77 K. Results are illustrated for the detection of auditory evoked magnetic responses of the human cortex and compared between high-[Formula Omitted] SQUIDs and a commercial low-[Formula Omitted] MEG system. Our results demonstrate that MEG systems can be upgraded using high-[Formula Omitted] SQUIDs to make them independent of helium and more user-friendly, saving operating costs and leading to the widespread utilization of MEG systems in clinical practice and at universities.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2012.2229094