Magnetic Scattering of Neutrons by Noncollinear Spin Densities

The spin densities associated with magnetic ions in a ferromagnet are not necessarily collinear with the net magnetization. It is shown that neutron scattering techniques can be used to distinguish noncollinear densities from the usual densities. The generalizations of neutron scattering theory required to account for these phenomena are indicated, and the effect of noncollinear spin densities on certain measurements is considered. (D.C.W.)