1997•Journal of Applied PhysicsRequires access

Proximity and coupling effects in superconductor/ferromagnet multilayers (invited)

C. L. Chien, J. Samuel Jiang, John Q. Xiao, Dragomir M Davidović, Daniel H. Reich

Abstract

New features in superconductor/ferromagnet multilayers have been observed. A nonmonotonic dependence of the superconducting Tc on the ferromagnetic layer thickness, due to the coupling across a thin magnetic layer, has been observed in both Nb/Gd multilayers and trilayers. The results are consistent with those of the predicted π-phase coupling. Effects on superconductivity due to insulating ferromagnetic layers have been observed in NbN/GdN multilayers, where the main pair-breaking effect is that of the ferromagnetic walls. The insulating ferromagnetic layers also give rise to very large superconducting critical fields.

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Key concepts: Ferromagnetism, Condensed matter physics, Superconductivity, Materials science, Proximity effect (electron beam lithography), Coupling (piping), Phase (matter), Layer (electronics)