Neutron scattering techniques have been used to study the structureof amorphous materials. The experiment used both polarizedincident and scattered neutron beams andso did not need to assume a collinear magnetic structure. Five different Fe-based amorphous materials were studied and the structures were found to differ. In the case of Fe8,B,, the spins are canted in a magnetic fieldof 2 T about 30" from the applied direction. The transverse components have only very short-range order. Other materials show less canting. Fe-Ni amorphous materials shows a large amount of disorder in the spin directions and in the aligned moment. ThissuggeststhattheNi atomsdocarryamagneticmomenlbulthatit may be largely misaligned to the Fe moment. Inelastic measurements of the density of magnetic statesshow averydifferent distribution tothatexpected fromapowderedferroma$net.This may arise from 'hidden' short-wavelength excitations.

No abstract

No abstract

The performance of the new neutron powder diffraction instrument PEARL that is installed at the research reactor of Delft University of Technology is reported. It is based on the optimization concepts developed by Cussen [Nucl. Instrum. Methods Phys. Res. Sect. A (2007), 583, 394–406], which lead to high performance competing with existing constant‐wavelength neutron powder diffractometers, despite the relatively low source brightness of the 2 MW reactor of Delft University of Technology.

The neutron scattering cross section below the Neel temperature in RbMnF3 has been studied with the aid of neutron spin polarisation analysis. In addition to the spin-wave scattering, a small central component was observed and found to be longitudinal in character. This longitudinal scattering is quasi-elastic, with an intensity that decreases with increasing wavevector and with decreasing temperature below TN.