Single layer YBaCuO-Gradiometer galvanically coupled to DC-SQUIDs were
Prepared on bicrystal substrates. The devices were operated at 77 K w
ithout any shielding. The best performance obtained was a field gradie
nt resolution of 0,5 pT/cm root Hz for a device with a baseline of 7 m
m and a pickup-area of 2 cm(2).