  Using a self-consistent Bogoliubov-de Gennes approach, we theoretically study
the proximity-induced density of states (DOS) in clean SFF spin-valves with
noncollinear exchange fields. Our results clearly demonstrate a direct
correlation between the presence of a zero energy peak (ZEP) in the DOS
spectrum and the persistence of spin-1 triplet pair correlations. By
systematically varying the geometrical and material parameters governing the
spin-valve, we point out to experimentally optimal system configurations where
the ZEPs are most pronounced, and which can be effectively probed via scanning
tunneling microscopy. We complement these findings in the ballistic regime by
employing the Usadel formalism in the full proximity limit to investigate their
diffusive SFF counterparts. We determine the optimal normalized ferromagnetic
layer thicknesses which result in the largest ZEPs. Our results can serve as
guidelines in designing samples for future experiments.
