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We describe the fabrication and operation of thin‐film dc SQUID’s of cylindrical geometry that make use of shunted Nb‐NbOx‐Pb tunnel junctions. A typical noise power spectrum is shown. At frequencies between 2×10−2 Hz and the electronic roll‐off frequency, the flux resolution is 3.5×10−5 φ0/(Hz)1/2, corresponding to a magnetic field resolution of 10−10 G/(Hz)1/2. This resolution appears to be set by intrinsic sensor noise. Below 2×10−2 Hz, the spectrum is approximately 1/f. A 20‐h plot of SQUID output as a function of time demonstrates an average drift of less than 2×10−5 φ0/h.

Thin-film dc SQUID with low noise and drift