Characteristics of strong ferromagnetic Josephson junctions with epitaxial barriers

C Bell*, R Loloee, G Burnell, MG Blamire, Chris Bell

*Corresponding author for this work

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

56 Citations (Scopus)

Abstract

We present the measurement of superconductor/ferromagnetic Josephson junctions, based on an epitaxial Nb bottom electrode and epitaxial Fe20Ni80 barrier. Uniform junctions have been fabricated with a barrier thicknesses in the range 2-12 nm. The maximum critical current density similar to 2.4 +/- 0.2 x 10(9) Am-2 was found for a device with a 3-nm-thick barrier at 4.2 K, corresponding to an average characteristic voltage ICRN similar to 16 mu V. The ICRN showed a nonmonotonic behavior with Fe20Ni80 thickness. The variation of the resistance of a unit area AR(N), of the junctions with barrier thickness gave a Nb/Py specific interface resistance of 6.0 +/- 0.5 f Omega m(2) and Fe20Ni80 resistivity of 174 +/- 50 n Omega m, consistent with other studies in polycrystalline samples.

Original languageEnglish
Article number180501
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume71
Issue number18
DOIs
Publication statusPublished - May 2005

Keywords

  • SUPERCONDUCTIVITY
  • MULTILAYERS
  • MAGNETISM
  • MAGNETORESISTANCE
  • FABRICATION
  • PERMALLOY

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