Neutron diffraction study of the umbrella structure on holmium iron garnet

Abstract
In Ho3Fe5O12, canting of the rare-earth magnetic moments is evidenced by neutron diffraction. Assuming the garnet to be cubic, analytic expressions of the superstructure lines are given as simple combinations of both components (parallel and perpendicular to [111]) of the Ho3+ moments. New parameters of the ’’umbrella structure’’ are given.