Abstract
We present an original method for studying the low frequency flux noise due to vortices in superconducting quantum interference device (SQUID) systems. We use two SQUIDs connected to the same washer in order to study the correlation of their outputs. A dedicated electronic system has been built so as to operate both SQUIDs at the same time. It was thus possible to distinguish fluctuations due to vortices located in the film far from the SQUID from fluctuations originating from vortices located close to the SQUID itself. In this article, the experimental setup is described and some preliminary noise measurements are presented.
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