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

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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 $1.98 \times 10^5$ 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.
7 pages, 5 figures, accepted for publication in Eur. Phys. J. B

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Superconductivity, Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/164176

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0612235
 http://arxiv.org/abs/cond-mat/0612235
 Eur. Phys. J. B 58, 123 (2007)
 doi:10.1140/epjb/e2007-00210-8

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arXiv