Multiple squid direct signal injection device formed on a single

Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Measuring or testing system or device

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324248, 505846, H01L 3900, G01R 33035

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active

057670439

ABSTRACT:
A low-noise directly coupled dc SQUID magnetometer is disclosed. The magnetometer provides for single layer fabrication and is particularly applicable to high-T.sub.c superconductors operating at 77 Kelvin. A pair of dc SQUIDs are connected and biased in series such that the output voltage modulation with applied flux of the dual SQUID magnetometer, is double that of a single SQUID magnetometer. The bias current is applied to one SQUID and removed from the second SQUID of the pair. The magnetometer pick-up coil is directly coupled to the SQUID pair, providing for coherent modulation of the series-connected SQUIDS and a reduction of flux density noise of the device by a factor of 1/.sqroot.2.

REFERENCES:
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patent: 5219826 (1993-06-01), Kapitulnik
patent: 5252921 (1993-10-01), Nakane et al.
Clarke, J., "SQUIDS: Theory and Practice", New Superconductivity Electronics, Kluwer Academic Publishers (1993) pp. 123-180.
Miklich, A.H., et al., "Bicrystal YBCO Dc SQUIDs With Low Noise", IEEE Transactions of Applied Superconductivity (1993) 3:(1)2434-2437.
Koelle, D. et al., "DC SQUID magnetometers from single layers of YBa.sub.2 Cu.sub.3 O.sub.7-x ", Applied Phisics Letters (1993) 63:(16)2271-2273.
Zhang, Y., et al., "Sensitive rf-SQUIDs and Magnetometers Operating at 77 K", IEEE Transactions on Applied Superconductivity (1993) 3:(1)2465-2468.

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