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0-π oscillations in nanostructured Nb/Fe/Nb Josephson junctions

Author

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  • S. Piano
  • J. W.A. Robinson
  • G. Burnell
  • M. G. Blamire

Abstract

The physics of the π phase shift in ferromagnetic Josephson junctions may enable a range of applications for spin-electronic devices and quantum computing. We investigate transitions from “0” to “π” states in Nb/Fe/Nb Josephson junctions by varying the Fe barrier thickness from 0.5 nm to 5.5 nm. From magnetic measurements we estimate for Fe a magnetic dead layer of about 1.1 nm. By fitting the characteristic voltage oscillations with existing theoretical models we extrapolate an exchange energy of 256 meV, a Fermi velocity of 1.98 ×10 5 m/s and an electron mean free path of 6.2 nm, in agreement with other reported values. From the temperature dependence of the I C R N product we show that its decay rate exhibits a nonmonotonic oscillatory behavior with the Fe barrier thickness. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Suggested Citation

  • S. Piano & J. W.A. Robinson & G. Burnell & M. G. Blamire, 2007. "0-π oscillations in nanostructured Nb/Fe/Nb Josephson junctions," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 58(2), pages 123-126, July.
    • Handle: RePEc:spr:eurphb:v:58:y:2007:i:2:p:123-126
    DOI: 10.1140/epjb/e2007-00210-8
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