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We study transport phenomena through a ballisticferromagnet-superconductor-ferromagnet (F/S/F) junction, comparing the case inwhich the ferromagnetic order in the two F layers is of the standard Stonertype with the case where it is driven by a spin mass mismatch (SMM). It isshown that the two mechanisms lead to a different behavior in the charge andthe spin conductances, especially when compared to the correspondingnon-superconducting ferromagnet-normal-ferromagnet (F/N/F) junctions. Inparticular, when the injected current is perpendicular to the barrier, for highbarrier transparency and large magnetization of the F layers, the large massmismatch gives rise to an enhancement of both low-bias charge and spinconductances of the F/S/F junction, which is not observed in the equal-masscase. When all the allowed injection directions are considered, the low biasenhancement of the charge conductance for SMM leads still holds for highbarrier transparency and large magnetization of the F layers. However, in thecase of non-transparent interfaces, spin transport with SMM ferromagnetsexhibits an opposite sign response with respect to the Stoner case at highbiases for all magnetization values, also manifesting a significantamplification induced by superconductivity at the gap edge. The above mentioneddifferences can be exploited to probe the nature of the electronic mechanismunderlying the establishment of the ferromagnetic order in a given material.

Spin and charge transport in ferromagnet-superconductor-ferromagnet heterostructures: Stoner versus spin mass mismatch mechanism