Development of a Josephson Junction-Based Superconducting True-Field Magnetometer

Author

Mitchell, E.E. ; Tilbrook, D.L. ; Lewis, C.J. ; Sullivan, P.R. ; Foley, C.P.

Author_Institution

CSIRO, Lindfield

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

714

Lastpage

717

Abstract

We have designed and fabricated a new range of thin-film superconducting true-field magnetometers (TFM) for use in detecting the true value of the magnetic field. Our TFMs enhance the applied magnetic field sensed at a Josephson junction by up to 70 times, as confirmed by a significant compression of the critical current versus magnetic field (Fraunhofer) characteristic. The resulting magnetic field sensitivities demonstrated were ~2 pT/radicHz. We compare the device parameters and performance at 77 K of several TFMs for two basic designs fabricated from thin films of YBCO.

Keywords

barium compounds; high-temperature superconductors; magnetic field measurement; magnetic sensors; magnetometers; superconducting junction devices; superconducting thin films; thin film sensors; yttrium compounds; Fraunhofer characteristics; Josephson junction-based magnetometer design; TFM fabrication; YBCO thin films; YBa₂Cu₃O₇ - System; magnetic field sensitivities; magnetic field sensor; temperature 77 K; thin-film superconducting true-field magnetometers; Critical current; Josephson junctions; Magnetic field measurement; Magnetic fields; Magnetic sensors; SQUID magnetometers; Superconducting filters; Superconducting thin films; Transfer functions; Yttrium barium copper oxide; Absolute magnetic field sensors; Josephson junction; superconducting magnetometer;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.898677

Filename

4277604