Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Magnetic Imaging and Scattering Techniques

MA 24.9: Vortrag

Mittwoch, 13. März 2013, 11:30–11:45, H22

Magnetic small–angle neutron scattering of two–phase bulk ferromagnets — •Dirk Honecker and Andreas Michels — Laboratory for the Physics of Advanced Materials, University of Luxembourg, Luxembourg

Based on micromagnetic theory we have derived analytical expressions for the magnetic small–angle neutron scattering cross section of a two–phase ferromagnet. The approach – valid close to magnetic saturation – provides access to several features of the spin structure such as perturbing magnetic anisotropy and dipolar stray fields. The micromagnetic SANS model inherently explains the ‘clover–leaf’ type angular anisotropies, which were previously observed for several nanostructured magnetic materials. Analysis of experimental neutron data of an iron–based soft magnetic nanocomposite yields information on the exchange–stiffness constant as well as on the anisotropy and dipolar fields.