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

S. Piano (), J. W.A. Robinson, G. Burnell and M. G. Blamire

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 58, issue 2, 123-126

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

Keywords: 74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects, 74.25.Sv Critical currents, 74.78.Db Low-Tc films, 74.25.Ha Magnetic properties, (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00210-8

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