The ability to control magnetic state of superconducting/ferromagnet heterostructures (S/F) by superconductivity is attracting attention in applied research on superconducting spintronics [1-4]. While at the moment, most research efforts are focused on simple S/F structures such as bilayers and trilayers, both the superconducting and the magnetic properties of more complex [S/F]n superlattices may qualitatively differ from the properties of their S/F unit cells. Tuning of parameters of such S/F “metamaterials” is a complicated task which requires involving many experimental and theoretical methods. Polarized Neutron Reflectometry (PNR) is an effective method allowing for depth-resolved study of vector magnetic state of S/F heterostructures and its change due to proximity effects. In this talk we will discuss our recent results on magnetic proximity effect in Gd/Nb [5] and design of pseudo spin-valve based on Co/Nb [6] superlattices.