DC SQUIDS with planar input coils

Conference · Thu Feb 28 23:00:00 EST 1985 · IEEE Trans. Magn.; (United States)

OSTI ID:6485530

Pegrum, C M; Donaldson, G B; Hutson, D; Tugwell, A

We describe the key parts of our recent work to develop a planar thin-film DC SQUID with a closely-coupled spiral input coil. Our aim has been to make a device that is superior to present RF SQUID sensors in terms of sensitivity and long-term reliability. To be compatible with an RF SQUID the inductance of the input coils must be relatively large, typically 2..mu..H, and the input noise current in the white noise region should be below 10pA Hz /SUP -1/2/ . A low level of 1/f noise is also necessary for many applications and should be achieved without the use of complex noisecancelling circuitry. Our devices meet these criteria. We include a description of work on window and edge junction fabrication using ion beam cleaning, thermal oxidation and RF plasma processing.

• Research Organization: Department of Applied Physics, University of Strathclyde, Glasgow, Scotland
• OSTI ID: 6485530
• Report Number(s): CONF-840937-
• Journal Information: IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. MAG-21:2; ISSN IEMGA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMICAL REACTIONS
CURRENTS
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FLUXMETERS
FREQUENCY RANGE
HZ RANGE
JUNCTIONS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OXIDATION
PERFORMANCE
RELIABILITY
SPUTTERING
SQUID DEVICES
SUPERCONDUCTING COILS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS