Neutron spin-echo technique applied to 3-D neutron polarisation analysis in magnetised media

In this paper a method, based on the principle of neutron spin-echo, is described to perform 3-D neutron polarisation analysis in magnetised media. This method, the so-called rotation compensation method, allows for the determination of the magnetic properties of a magnetised sample that are contained in the parallel and perpendicular component of the polarisation, with respect to the sampleʹs magnetisation, after interaction with the sample. This can be done without any corrections for the depolarisation of the beam due to the finite wavelength distribution of the beam.