MAGNETISM AND NEUTRON-SCATTERING

Magnetic neutron scattering is very closely connected to the fundament al magnetic quantities of magnetisation and susceptibility. This is be cause, to a very high degree of approximation which becomes exact at l ong neutron wavelengths, the interaction of the neutron magnetic dipol e moment is with the local magnetic induction in the magnetic material . The strength of neutron scattering for the investigation of magnetic materials lies in this and the facility of the technique to probe Fou rier components of the moment and the susceptibility with wavelengths down to atomic distances, as well as to probe susceptibility fluctuati on time scales the same as those that are thermally excited. This pape r provides a concise account of the formal connection between neutron scattering cross sections and more familiar bulk magnetic parameters.