"Skew" Scattering of Cold Unpolarized Neutrons in Ferromagnetic Crystal

• Published in: Journal of the Physical Society of Japan Vol. 82; no. 6; pp. 064714 - 064714-5
• Main Author: Udalov, Oleg Georgievich
• Format: Journal Article
• Language: English
• Published: The Physical Society of Japan 15-06-2013
• ISSN: 0031-9015; 1347-4073
• DOI: 10.7566/JPSJ.82.064714

The problem of neutron scattering by a single magnetic atom is theoretically considered in the second order perturbation theory. It is demonstrated that the elastic scattering of unpolarized neutron by a magnetic atom is skewed, i.e., it contains a term including the symmetry of a mixed product of the atom magnetic moment and the wave vectors of incident and scattered neutrons $([\mbi{k}\times \mbi{k}']\cdot \mbi{h})$. The problem of dynamical diffraction of unpolarized neutrons by a perfect ferromagnetic crystal is investigated. We consider the case when the Bragg condition is satisfied for two reciprocal lattice vectors. In this situation the neutron skew scattering manifests itself as a dependence of the diffracted beam intensity on the sign of the crystal magnetization. The diffraction of unpolarized neutrons by a Co crystal has been calculated. The change in the intensity through the magnetization reversal in this case is estimated at 40%.