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Long baseline thin film SQUID gradiometers

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5 Author(s)
Stolz, R. ; Dept. of Cryoelectron., Inst. for Phys. High Technol., Jena, Germany ; Zakosarenko, V.M. ; Fritzsch, L. ; Oukhanski, N.
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We have developed a highly sensitive SQUID gradiometer for unshielded operation in the Earth's magnetic field. It is implemented in an all-refractory Nb-AlOx-Nb technology, and consists of gradiometer pick-up loops with an inductance of about 250 nH coupled to the SQUID by a flux transformer. The SQUID is designed as a highly balanced second order gradiometer consisting of four pairs of washers. It has an inductance of about 300 pH. The gradiometer chip has a size of 6 cm ×2 cm. The baseline of the gradiometer is 4 cm and the effective volume is about 300 mm3. We measured a white noise level of below 10 μΦ0/Hz½, corresponding to a gradient field resolution smaller than 40 fT/m·Hz½. The total flux noise in the frequency band from 0.01 Hz to 10 Hz is below 150 μΦg. The balance of the gradiometer was determined by moving the gradiometer in the Earth's magnetic field. Due to the high balance we can operate the gradiometer in field experiments

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )