Observation of periodic π-phase shifts in ferromagnet-superconductor multilayers

V. Shelukhin, A. Tsukernik, M. Karpovski, Y. Blum, K. B. Efetov, A. F. Volkov, T. Champel, M. Eschrig, T. Löfwander, G. Schön, A. Palevski

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number174506
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number17
DOIs
StatePublished - 2006

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