Angular dependence of superconductivity in superconductor/spin-valve heterostructures

Alejandro A. Jara, Christopher Safranski, Ilya N. Krivorotov, Chien Te Wu, Abdul N. Malmi-Kakkada, Oriol T Valls, Klaus Halterman

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62 Scopus citations

Abstract

We report measurements of the superconducting transition temperature, Tc, in CoO/Co/Cu/Co/Nb multilayers as a function of the angle α between the magnetic moments of the Co layers. Our measurements reveal that Tc(α) is a nonmonotonic function, with a minimum near α=π/2. Numerical self-consistent solutions of the Bogoliubov-de Gennes equations quantitatively and accurately describe the behavior of Tc as a function of α and layer thicknesses in these superconductor/spin-valve heterostructures. We show that experimental data and theoretical evidence agree in relating Tc(α) to enhanced penetration of the triplet component of the condensate into the Co/Cu/Co spin valve in the maximally noncollinear magnetic configuration.

Original languageEnglish (US)
Article number184502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number18
DOIs
StatePublished - May 8 2014

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