Neutron depolarisation in ferrofluids during magnetising/demagnetising cycles

3-D neutron depolarisation data were taken from ferrofluids of several concentrations along magnetic loops with the field both parallel and perpendicular to the neutron direction. The data taken at a concentration of 10 vol % of Fe3O4 indicate a strong dependence of the organisation of the ferrofluid particles on the magnetic history over several cycles of the field.