Triplet correlations at ferromagnet/superconductor interfaces. Mechanism and implications

The interface between a ferromagnet and an s-wave superconductor offers a rich variety of physical phenomenons due to different intrinsic correlation effects. Even more interesting phenomenons are to be expected if the interface region allows for some kind of spin-flip mechanism, thus generating equal-spin spin-triplet correlations which are compatible with the ferromagnetic exchange field and leading to the observable long-range proximity effect. Here, we present results based on numerical solutions of the spin-generalised microscopic Bogoliubov-de Gennes equations incorporating a tight-binding model in the clean limit. We compare different types of interfaces that have been suggested to generate spin-triplet pairing correlations and discuss implications on the effectiveness.