Observation of Periodic pi-Phase Shifts in Ferromagnet-Superconductor Multilayers

Details Observation of Periodic pi-Phase Shifts in Ferromagnet-Superconductor Multilayers Observation of Periodic pi-Phase Shifts in Ferromagnet-Superconductor Multilayers

2005-12-22

arxiv.org/abs/cond-mat/0512593v1

Phys. Rev. B 73,1 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.73.174506

We report complementary studies of the critical temperature and the critical current in ferromagnet (Ni) - superconductor (Nb) multilayers. The observed oscillatory behavior of both quantities upon variation of the thickness of the ferromagnetic layer is found to be in good agreement with theory. The length scale of oscillations is identical for both quantities and is set by the magnetic length corresponding to an exchange field of 200 meV in Ni. The consistency between the behavior of the two quantities provides strong evidence for periodic pi- phase shifts in these devices.

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