Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions

Details Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions

2006-06-02

arxiv.org/abs/cond-mat/0606067v2

Physics

Condensed Matter

Superconductivity

4 pages 3 figures 1 table. Revised version as accepted for publication. To appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.97.177003

We report magnetic and electrical measurements of Nb Josephson junctions with strongly ferromagnetic barriers of Co, Ni and Ni80Fe20 (Py). All these materials show multiple oscillations of critical current with barrier thickness implying repeated 0-pi phase-transitions in the superconducting order parameter. We show in particular that the Co barrier devices can be accurately modelled using existing clean limit theories and so that, despite the high exchange energy (309 meV), the large IcRN value in the pi-state means Co barriers are ideally suited to the practical development of superconducting pi-shift devices.

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