Design of improved integrated thin-film planar dc SQUID gradiometers

Journal Article · Sun Dec 01 04:00:00 EST 1985 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.335519· OSTI ID:6341050

Ketchen, M B

Key issues in the design of improved first and second derivative, thin-film, planar dc SQUID gradiometers are discussed. The introduction of a planar coupling scheme to optimally couple the planar dc SQUID to the gradiometer pickup loops leads to significantly increased sensitivity as well as elimination of the sensitivity differences between series and parallel gradiometer loop configurations. Two-hole and figure-8 SQUID designs are presented which are consistent with intrinsic gradiometer balance < or approx. =10/sup -4/ against uniform field changes. Straightforward calculations together with data from existing low-noise SQUIDs suggest improvements in gradient sensitivity on the order of 10/sup 2/ over existing planar gradiometers.

• Research Organization: IBM T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598
• OSTI ID: 6341050
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 58:11; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment &amp; Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COUPLING
DESIGN
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
FLUXMETERS
MAGNETIC FIELDS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
SENSITIVITY
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
THIN FILMS