Title :
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
fDate :
6/1/2007 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.898677
