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0-π oscillations in nanostructured Nb/Fe/Nb Josephson junctions |
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| Authors: | S Piano J WA Robinson G Burnell M G Blamire |
| Institution: | (1) Department of Materials Science, University of Cambridge - Pembroke Street, Cambridge, CB2 3QZ, UK;(2) Physics Department, CNR-Supermat Laboratory, University of Salerno - Via S. Allende, 84081 Baronissi (SA), Italy;(3) School of Physics and Astronomy, E.C. Stoner Laboratory, University of Leeds, Leeds-LS2 9, JT, UK |
| 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 ×105 m/s and an electron mean free path of 6.2 nm, in agreement with other reported values. From the temperature dependence of the ICRN product we show that its decay rate exhibits a nonmonotonic oscillatory behavior with the Fe barrier thickness. |
| 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 |
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