Inelastic mode of polarised reflectometer REFLEX-P for observation of surface phonons and magnons

Abstract

A new mode of the time-of-flight polarised neutron reflectometer for investigation of inelastic interaction between thermal neutrons and surface excitations via reflection by thin films is described. Using the direct inelastic method with rotating monochromator ( Δλ/λ=4×10 −2/λ, ΔE/E=0.09×10 −2×E 1/2, [λ]= A ̊ , [E] =meV) and time-of-flight energy analysis the upper limit of the probability of thermal neutron – surface phonon inelastic collision for the Ni/Ti multilayer structure in the energy transfer region near the maximum of state density function of bulk Ni has been estimated experimentally.