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A low-noise integrated SQUID gradiometer for biomagnetic sensors

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5 Author(s)
Y. H. Lee ; Korea Res. Inst. of Stand. & Sci., Taejon, South Korea ; H. C. Kwon ; J. M. Kim ; Y. K. Park
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We developed a low-noise and compact SQUID gradiometer for biomagnetic multichannel applications. The SQUID is based on a double relaxation oscillation SQUID and provides very large flux-to-voltage transfer coefficients, allowing simple flux-locked loop electronics to be used for SQUID operation. The pickup coil is a first-order planar gradiometer integrated on the same wafer as the SQUID and has a baseline of 40 mm. The field gradient noise of the SQUID gradiometer in flux-locked loop mode is around 1 fT/cm√Hz at 100 Hz, measured inside a magnetically shielded room

Published in:

IEEE Transactions on Magnetics  (Volume:35 ,  Issue: 5 )