NDLI: Thin-film DC SQUID gradiometer

Content Provider	IEEE Xplore Digital Library
Author	Ketchen, M. Goubau, W. Clarke, J. Donaldson, G.
Copyright Year	1965
Abstract	A thin-film dc SQUID gradiometer has been fabricated on a single planar substrate. The superconducting pick-up loops consist of a lead strip in the form of a 48 × 16 mm rectangle with a niobium strip bisecting the rectangle. A tunnel junction dc SQUID is symmetrically located on the niobium strip. If there is a spatial gradient in the magnetic field applied to the gradiometer so that the magnetic fluxes threading the two pick-up loops differ, a supercurrent is induced in the niobium strip that is detected by the SQUID. The noise power spectrum of the SQUID is white down to a frequency of about 5 × 10^-2Hz with a rms flux noise of 8 × 10^-5φoHz^-1/2, corresponding to a gradient sensitivity of 2 × 10^-10G cm^-1Hz^-1/2.
Sponsorship	IEEE Magnetics Society
Starting Page	372
Ending Page	374
Page Count	3
File Size	307717
File Format	PDF
ISSN	00189464
Volume Number	13
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1977-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transistors SQUIDs Strips Niobium Superconducting thin films Magnetic noise Superconducting device noise Substrates Josephson junctions Magnetic fields
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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