Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 46: Magnetic Imaging Techniques II

MA 46.1: Talk

Thursday, March 12, 2026, 09:30–09:45, POT/0361

Spin-Disorder-Induced Angular Anisotropy in Polarized Magnetic Neutron Scattering — Ivan Titov, •Venus Rai, and Andreas Michels — Department of Physics and Materials Science, University of Luxembourg, 162A Avenue de la Faiencerie, 1511 Luxembourg

We experimentally report a hitherto unseen angular anisotropy in the polarized small-angle neutron scattering (SANS) cross section of a magnetically strongly inhomogeneous material [1]. Based on an analytical prediction using micromagnetic theory, the difference between the spin-up and spin-down SANS cross sections is expected to show a spin-disorder-induced anisotropy. The effect is particularly pronounced in inhomogeneous magnetic materials, such as nanoporous ferromagnets, magnetic nanocomposites, or steels, which exhibit large nanoscale jumps in the saturation magnetization at internal pore-matrix or particle-matrix interfaces. Analysis of the experimental neutron data constitutes a method for determining the exchange-stiffness constant. Our results for the nuclear-magnetic interference terms contained in the polarized magnetic neutron scattering cross section might also be of relevance to other neutron techniques.

[1] I. Titov, M. Bersweiler, M. P. Adams, E. P. Sinaga, V. Rai, Š. Liščák, M. Lahr, T. L. Schmidt, V. M. Kuchkin, A. Haller, K. Suzuki, N.-J. Steinke, D. A. Venero, D. Honecker, J. Kohlbrecher, L. F. Barquín, and A. Michels, Phys. Rev. Lett. 135, 196706 (2025)

Keywords: angular anisotropy; small angle neutron scattering; spin disorder; micromagnetism; nanoporous ferromagnets