Neutron reflectometry at Dhruva reactor: Specular and off-specular neutron reflectivity studies

A polarized neutron reflectometer (PNR) has been installed at the Dhruva reactor, Trombay. This instrument has been designed for vertical sample geometry, where the reflectivity is measured in the horizontal plane of reflection. Polarized neutron reflectometry is an important non-destructive tool to determine the chemical as well as magnetic structure of thin film samples. Specular reflectivity data collected on a neutron monochromator and Fe/Ge multilayer sample is presented. Off-specular reflectivity data from Ni film has been used to obtain the morphology of the air-film interface and of a buried interface. (author)