Dc-SQUID magnetometers and gradiometers on the basis of quasiplanar ramp-type Josephson junctions

Nonaqueous Br-ethanol chemical etching was successfully used for the preparation of the Josephson junctions, vias and crossovers in magnetometers including flux transformers. PrBa/sub 2/Cu/sub 3/O/sub 7-x/ thin films were used for the barrier layer in the Josephson junctions of the SQUIDs and as an...

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Bibliographic Details
Published in:	IEEE transactions on applied superconductivity Vol. 7; no. 2; pp. 3702 - 3705
Main Authors:	Faley, M.I., Poppe, U., Urban, K., Krause, H.-J., Soltner, H., Hohmann, R., Lomparski, D., Kutzner, R., Wordenweber, R., Bousack, H., Braginski, A.I., Slobodchikov, V.Yu, Gapelyuk, A.V., Khanin, V.V., Maslennikov, Yu.V.
Format:	Journal Article
Language:	English
Published:	IEEE 01-06-1997
Subjects:	Chemicals Critical current density Electrodes Etching Josephson junctions Magnetic shielding Power transformer insulation SQUID magnetometers Temperature sensors Transistors
Online Access:	Get full text
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Summary:	Nonaqueous Br-ethanol chemical etching was successfully used for the preparation of the Josephson junctions, vias and crossovers in magnetometers including flux transformers. PrBa/sub 2/Cu/sub 3/O/sub 7-x/ thin films were used for the barrier layer in the Josephson junctions of the SQUIDs and as an insulation in the junctions and in the flux transformers. Dc-SQUID magnetometers with small inductances and even without flux antennas were used for NDE applications which mainly require a high dynamic range. Highly sensitive devices were prepared with flip-chip flux antennas. An ac-bias SQUID electronics significantly improves the sensitivity of the magnetometers at low frequencies.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	1051-8223 1558-2515
DOI:	10.1109/77.622222