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Investigation of thin film DC SQUID gradiometer using a single YBCO layer

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8 Author(s)
P. Seidel ; Inst. fur Festkorperphys., Friedrich-Schiller-Univ., Jena, Germany ; V. Zakosarenko ; F. Schmidl ; L. Dorrer
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Thin film DC SQUID gradiometers with a large effective pickup area using only a single YBa/sub 2/Cu/sub 3/O/sub 7-x/ layer and step edge Josephson junctions on SrTiO/sub 3/ substrate have been prepared. The planar gradiometer consist of two loops coupled directly to a small area SQUID in the center of the structure. The main advantage in comparison to magnetometers is the possibility of direct measurements in magnetically unshielded environment. At 77 K without bias reversal technique we obtain a white noise level about 3.6/spl times/10/sup -5/ /spl Phi//sub 0//Hz/sup 1/2/ or 700 fT/cmHz/sup 1/2/. Some peculiarities for a two SQUID arrangement with 4 Josephson junctions are observed and simulated on the base of the RSJ model.<>

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IEEE Transactions on Applied Superconductivity  (Volume:5 ,  Issue: 2 )