Abstract
The correlation of the outputs of two dc-SQUIDs connected to the same solid washer wasstudied. A dedicated electronic system was used in order to operate both SQUIDs at thesame time. It was found that the temporal correlation of the SQUID outputs isstrongly dependent on the geometry of the SQUID loop. For a solid washer, theflux noise is mainly due to vortices located close to the SQUIDs. However, bysurrounding the SQUID loop with a hole patterned in the superconducting solidwasher, it is possible to drastically reduce the flux penetration around the loop. Theresulting flux noise becomes dominated by vortices located inside the washer farfrom the SQUIDs. Magneto-optical images were also used to visualize the fluxpenetration inside the washer around the slit of such SQUIDs. These confirm previousdescriptions of vortex penetration deduced from the electrical measurements.
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