Abstract:We present an integrated thin-film gradiometric SQUID sensor in Nb-Al/Al 2 O 3 -Nb technology. The dc-SQUID converter is designed as a parallel inductance double-washer SQUID. It is inductively coupled to a planar parallel inductance gradiometer antenna with 15 mm baseline by two series input coils with eight turns each. The field gradient sensitivity is 0.5 nT cm −1 −1 0 . The intrinsic field gradient resolution down to 1 Hz is 5 fT cm −1 Hz −1/2 , measured in a shielded environment.The sensor can be operated… Show more
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