Yh. Lee et al., 3-CHANNEL DOUBLE RELAXATION OSCILLATION SQUID MAGNETOMETER SYSTEM WITH SIMPLE READOUT ELECTRONICS, IEEE transactions on applied superconductivity, 5(2), 1995, pp. 2156-2159
Recently several approaches have been made to simplify the readout sch
eme of the standard de SQUID. A Double Relaxation Oscillation SQUID(DR
OS) consisting of a hysteretic de SQUID and a reference junction in se
ries shunted by an inductor and a resistor can provide a very large fl
ux-to-voltage transfer coefficient. Thus, a DROS with direct readout w
ith room temperature de amplifier can be a good candidate for the next
-generation SQUID magnetometer. We report on tile development of a 3-c
hannel magnetometer system based on DROS. The DROS is based on Nb/AlOx
/Nb Josephson junctions and the main feature of the system is its simp
le readout electronics.