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We consider a long diffusive Josephson junction where the weak link is a thinnormal metal (N) - ferromagnetic (F) bilayer (N and F form parallel linksbetween the superconductors (S)). We show that superconductivity in the weaklink can be described by an effective one-dimensional Usadel equationcontaining a "diluted" exchange field as well as a weak depairing term that iscaused by the inherent inhomogeneity of the bilayer. The depairing mechanismdistinguishes the S(N/F)S system from an SFS junction and affects the densityof states of the S(N/F)S junction. It results in the suppression of the minigapin the spin-resolved density of states. The depairing rate and the minigap areexpressed in terms of geometrical parameters, the Thouless energy and theeffective exchange field. The effective one-dimensional theory can be appliedto various structures with thin inhomogenous links and shows good agreementwith numerical solutions of the original two-dimensional equations. We alsodiscuss ways to reveal the predicted effect experimentally.

Minigap suppression in S(N/F)S junctions