Physics – Condensed Matter – Superconductivity
Scientific paper
2006-12-11
Eur. Phys. J. B 58, 123 (2007)
Physics
Condensed Matter
Superconductivity
7 pages, 5 figures, accepted for publication in Eur. Phys. J. B
Scientific paper
10.1140/epjb/e2007-00210-8
The physics of the $\pi$ 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 ``$\pi$'' 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 $1.98 \times 10^5$ m/s and an electron mean free path of 6.2 nm, in agreement with other reported values. From the temperature dependence of the $I_CR_N$ product we show that its decay rate exhibits a nonmonotonic oscillatory behavior with the Fe barrier thickness.
Blamire Mark G.
Burnell Gavin
Piano Samanta
Robinson J. W. A.
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