• DocumentCode
    962741
  • Title

    Thin-film DC SQUID gradiometer

  • Author

    Ketchen, Mark B. ; Goubau, Wolfgang M. ; Clarke, John ; Donaldson, Gordon B.

  • Author_Institution
    University of California, Berkeley, California
  • Volume
    13
  • Issue
    1
  • fYear
    1977
  • fDate
    1/1/1977 12:00:00 AM
  • Firstpage
    372
  • Lastpage
    374
  • 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.
  • Keywords
    Magnetometers, superconducting; Josephson junctions; Magnetic fields; Magnetic noise; Niobium; SQUIDs; Strips; Substrates; Superconducting device noise; Superconducting thin films; Transistors;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.1977.1059485
  • Filename
    1059485
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=962741