Superconducting-Magnetic Proximity Systems in the Clean Limit: Inhomogeneous Magnetization and Itinerant Heterostructures*

We analyze pair correlations and the magnetic structure in superconducting-magnetic heterostructures in the clean limit. Two models are considered. In the first, we study the effect of doping and impurities on pair correlations in a magnetic trilayer embedded between two superconductors. We focus on the singlet-triplet mixing for different inhomogeneities of the magnetic multilayer and compare the results with the diffusive regime. The second model is a heterostructure which is made from itinerant ferromagnets and superconductors. Contrary to the majority of previous models we do not fix the magnetic configuration in the material but study Hubbard-Heisenberg type single-band models which display itinerant ferromagnetism as a mean-field ground state. This allows us to investigate the influence of adjacent superconducting layers on the properties of the ferromagnetic.