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Poster (Scientific congresses, symposiums and conference proceedings)
Magnetic SANS correlation functions of bulk magnetic materials
Mettus, Denis; Michels, Andreas
2015VI European Conference on Neutron Scattering
 

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Keywords :
SANS; Magnetism; Correlation function; Modelling
Abstract :
[en] We present model calculations, based on the continuum theory of micromagnetics, for the correlation function of the spin-misalignment SANS cross section of bulk ferromagnets (e.g. elemental polycrystalline ferromagnets, soft and hard magnetic nanocomposites, nanoporous ferromagnets, or magnetic steels). For such materials, the spin disorder which is related to spatial variations in the saturation magnetization and magnetic anisotropy field results in strong spin-misalignment scattering dΣM/dΩ along the forward direction [1]. When the applied magnetic field is perpendicular to the incoming neutron beam, the characteristics of dΣM/dΩ (e.g. the angular anisotropy on a two-dimensional detector or the asymptotic power-law exponent) are determined by the ratio of magnetic anisotropy-field strength Hp to the jump ΔM in the saturation magnetization at internal interfaces. Here, we analyze the corresponding one and two-dimensional real-space correlations as a function of applied magnetic field, ratio Hp/ΔM, single-particle form factor, and particle volume fraction. Finally, we compare the theoretical results for the correlation function to experimental data on a Nd-Fe-B-based nanocomposite.
Disciplines :
Physics
Author, co-author :
Mettus, Denis ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Michels, Andreas  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
no
Language :
English
Title :
Magnetic SANS correlation functions of bulk magnetic materials
Publication date :
02 September 2015
Number of pages :
90x120 cm
Event name :
VI European Conference on Neutron Scattering
Event place :
Zaragoza, Spain
Event date :
from 30-08-2015 to 04-09-2015
Audience :
International
Available on ORBilu :
since 13 April 2016

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