High-temperature single-layer SQUID gradiometers with long baseline and parasitic effective area compensation

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, , Citation C M Pegrum et al 1999 Supercond. Sci. Technol. 12 766 DOI 10.1088/0953-2048/12/11/322

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1 Department of Physics and Applied Physics, University of Strathclyde, Glasgow G4 0NG, UK

Dates

  1. Received 22 June 1999

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0953-2048/12/11/766

Abstract

First-order HTS SQUID gradiometers were fabricated on 30 × 10 mm2 bicrystal substrates. These devices have a baseline of 13 mm, intrinsic balance levels of ~1/700 and a typical gradient sensitivity at 1 kHz of 79 fT cm-1 Hz-1/2. A two-SQUID coupling scheme is discussed that further enhances the device's ability to reject uniform fields.

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10.1088/0953-2048/12/11/322