SPINE ANALYSIS AND NEW EFFECTS IN REFLECTIVITY MEASUREMENTS

We present two neu effects in polarized neutron reflectivity. We show that we have a nonsymmetric spin-flip signal in reflectivity measureme nts an magnetic films when the external field is not negligible. This phenomenon is due to different Larmor precessions for the two spin sta les and has to be taken into account in some experiments. The second e ffect is still not understood, but we present results indicating that the specular reflection on a nonmagnetic surface can induce a neutron beam depolarization or rotation.