Phys. Rev. B 73, 174506 (2006) [5 pages]Observation of periodic π-phase shifts in ferromagnet-superconductor multilayersReceived 6 March 2006; published 8 May 2006 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 π phase shifts in these devices. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.73.174506
DOI:
10.1103/PhysRevB.73.174506
PACS:
74.78.Fk, 74.25.Ha, 74.25.Sv, 74.62.−c
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