Multilayer thin films as polarizing monochromators for neutrons

Recent progress in the development of polarizing multilayer thin-film monochromators for neutrons is reported. In particular, multilayers consisting of thin films of Fe and Ge with bilayer thicknesses of the order of 50 Å have been made with high peak reflectives and polarizing efficiencies. The results of measurements of multibilayer reflectivity and polarizing efficiency are compared with other neutron polarizers. A picture of the microscopic structure of the individual Fe and Ge films has also been obtained. Finally, practical applications of polarizing multibilayers are discussed.