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We have fabricated two different designs of niobium dc nano-SQUIDs using focussed ion beam (FIB) lithography with loops and track widths down to 70 nm. We report on the voltage-flux and noise performance of the devices in zero field and with magnetic fields of up to 1 T applied either in-plane or perpendicular to the plane at temperatures between 5 K and 9 K. We compare the measurements with modeled estimates of the inductance of the structures and the conventional theory of noise in dc SQUIDs.
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Romans et al. (2010) studied this question.
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