We have investigated the effect of device geometry on the excess low frequency 1/f noise of thin-film YBCO dc SQUIDs cooled in static magnetic fields. The key factor in eliminating this noise is the reduction of the linewidth of the SQUID loop to a value below the average separation of the flux vortices. The spectral density of the flux noise in these devices was independent of cooling field up to 33 /spl mu/T in the best case. Estimates indicate that incorporating this device into a directly-coupled magnetometer would not increase the noise further.
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Dantsker et al. (1997) studied this question.
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