  The Riccati formulation of the quasiclassical theory of nonequilibrium
superconductors is developed for spin-dependent scattering near magnetic
interfaces. We derive boundary conditions for the Riccati distribution
functions at a spin-active interface that are applicable to a wide range of
nonequilibrium transport properties of hybrid systems of superconducting and
magnetic materials. We use these results to calculate spin, charge and heat
transport for normal metal-ferromagnet-superconductor (NFS) and
superconducting-ferromagnetic-superconducting (SFS) point contacts.
