Neutron Depolarisation in Magnetic Recording Materials (Neutronen Depolarisatiein Materialen voor Magnetische Registratie)

摘要

In this thesis the three-dimensional neutron depolarization (ND) technique wasapplied to study the magnetic properties of magnetic recording materials. In order to apply ND to this study and also to the study of the magnetic properties of other materials, the ND set-ups SP and KP were upgraded by installing new polarizers and analyzers. For the SP a new depolarization module was designed and installed. This module allows one to perform fully automated and computer controlled measurements of the depolarization as a function of the position and transmission angle of the neutron beam in the sample. The rotation compensation method and a spin-echo coil system (SpECS) were developed, tested and installed in the SP.