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Flip-chip-type high-Tc gradiometer for biomagnetic measurements in unshielded environment
Authors:TIAN Yongjun  WANG Tiansheng  CHEN Ke  CHEN Lie  ZHENG Dongning  TIAN Yongjun  WANG Tiansheng  QI Hanhong  Sven LINZEN  Frank SCHMIDL  Paul SEIDEL
Abstract:A flip-chip-type gradiometer has been constructed with a 10 mm×5 mm planar DC-SQUID gradiometer fabricated on a SrTiO3 bicrystal substrate and a flux transformer made from a YBCO*/YBCO/CeO2/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 fT·cm-1·Hz-1/2 in the white region and 596 fT·cm-1Hz-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.
Keywords:high-Tc  SQUIDs  gradiometer  magnetocardiogram
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