Spin valve Josephson junctions

C Bell*, G Burnell, CW Leung, EJ Tarte, MG Blamire, Chris Bell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

4 Citations (Scopus)

Abstract

We are currently researching Nb-based Josephson junctions with magnetic barriers in which the magnetic character can be actively changed, with the final aim of producing a magnetically controllable pi-junction. Pseudo-spin-valve Nb/Fe20Ni80/Cu/Co/Nb Josephson junctions have been grown by d.c. magnetron sputtering. As we have previously reported [1], the spin-valve magnetoresistance could be measured at high bias at 4.2 K. The zero field critical current of the junction could also be varied by preparing the spin valve in different remanent states. Jumps and smooth changes in the critical current were observed, in line with the changes in magnetoresistance. In this work we discuss the effect of varying the total barrier thicknesses on the change in the critical current, as well as varying the Co : Fe20Ni80 ratio.

Original languageEnglish
Pages (from-to)908-911
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume15
Issue number2
Publication statusPublished - Jun 2005
Event2004 Applied Superconductivity Conference - Jacksonville, FL, United States
Duration: 3 Oct 20048 Oct 2004

Keywords

  • Josephson junctions
  • magnetoresistive devices
  • FERROMAGNET
  • FILMS
  • SUPERCONDUCTORS
  • FABRICATION

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