Abstract
A dc SQUID magnetometer, integrated on a 7.2 × 7.2 mm2 chip with 8 pick-up loops in parallel has been applied at millikelvin temperatures with a direct coupling to the magnetic samples. The SQUID was mounted in a superconducting hollow cylinder with frozen-in fields up to 6 mT, and only the Josephson junctions were shielded by attaching a foil of Nb3Sn (diameter 1mm) on the chip. The experimental set-up is used as a magnetic calorimeter for particle detection with high energy resolution.
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