Contribution to a conference proceedings FZJ-2012-00802

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High-Tc DC SQUIDs for magnetoencephalography

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2012
IEEE New York, NY

The Applied Superconductivity Conference, PortlandPortland, Oregon, 7 Oct 2012 - 12 Oct 20122012-10-072012-10-12 New York, NY : IEEE ()

Abstract: We have investigated the microstructural and electron transport properties of 45° 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-Tc SQUID magnetometers also incorporate 16 mm multilayer superconducting flux transformers on the MgO substrates and demonstrate a magnetic field resolution of ~ 4 fT/√Hz at 77 K. Results are illustrated for the detection of auditory evoked magnetic responses of the human cortex and compared between high-Tc SQUIDs and a commercial low-Tc MEG system. Our results demonstrate that MEG systems can be upgraded using high-Tc 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.

Classification:

Contributing Institute(s):
  1. Zentralinstitut für Elektronik (ZEA-2)
  2. Physik der Medizinischen Bildgebung (INM-4)
  3. Mikrostrukturforschung (PGI-5)
Research Program(s):
  1. 423 - Sensorics and bioinspired systems (POF2-423) (POF2-423)

Appears in the scientific report 2012
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Institutssammlungen > INM > INM-4
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