期刊
JOURNAL OF APPLIED CRYSTALLOGRAPHY
卷 48, 期 -, 页码 1437-1450出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600576715013187
关键词
small-angle neutron scattering; correlation function; micromagnetics; magnetic materials
资金
- National Research Fund of Luxembourg (CORE/INTER) [INTER/DFG/12/07]
- National Research Fund of Luxembourg (ATTRACT) [FNR/A09/01]
On the basis of the continuum theory of micromagnetics, the correlation function of the spin-misalignment small-angle neutron scattering cross section of bulk ferromagnets (e.g. elemental polycrystalline ferromagnets, soft and hard magnetic nanocomposites, nanoporous ferromagnets, or magnetic steels) is computed. 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 d Sigma(M)/d Omega along the forward direction. When the applied magnetic field is perpendicular to the incoming neutron beam, the characteristics of d Sigma(M)/d Omega (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 Delta M in the saturation magnetization at internal interfaces. Here, the corresponding one- and two-dimensional real-space correlations are analyzed as a function of applied magnetic field, the ratio H-p/Delta M, the single-particle form factor and the particle volume fraction. Finally, the theoretical results for the correlation function are compared with experimental data on nanocrystalline cobalt and nickel.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据