Abstract
A flip-chip-type gradiometer has been constructed with a 10 mm x 5 mm planar DCSQUID gradiometer fabricated on a SrTiO 3 bicrystal substrate and a flux transformer made from a YBCO * /YBCO/Ce0 2 /YSZ multilayer on a Φ50.8 mm Si wafer. The coupling coefficient between the flux transformer and the planar gradiometer is 0.18. The transformer increases effectively the resolution of the gradiometer. A magnetic field gradient resolution of 73 ff. cm -1 Hz -1/2 in the white region and 596 fT- cm -1 Hz -1/2 at 1 Hz has been obtained. High quality magnetocardiogram signals have been successfully measured by using this flip-chip-type gradiometer in an unshielded environment.
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