Longitudinal polarization analysis in small-angle neutron scattering
Longitudinal polarization analysis in small-angle neutron scattering
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DOI：
10.1140/epjb/e2010-00191-5
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发表时间：
2010-07-01
影响因子：
1.6
通讯作者：
Michels, A.
中科院分区：
文献类型：
--
作者：
Honecker, D.;Ferdinand, A.;Michels, A.
由于He-3自旋滤波器的最新进展，现在才有可能在小角中子散射（SANS）实验中进行常规的纵向（一维）中子自旋分析（POLARIS）。本文的目的是简要介绍该技术并讨论第一次实验数据。特别是，对于最常见的散射几何形状，当外加磁场垂直于入射中子束时，我们给出了块体铁磁体的非自旋翻转和自旋翻转SANS截面的方程，并讨论了各种角度的各向异性和不对称性以及一些选择的基于铁铁的软磁纳米晶合金的实验结果。特别地，我们表明对自旋翻转数据的分析允许人们获得磁化的三个矢量（傅里叶）分量的幅度平方。
Due to recent progress in the development of He-3 spin filters, it has only now become possible to perform routinely longitudinal (one-dimensional) neutron-spin analysis (POLARIS) in small-angle neutron scattering (SANS) experiments. It is the purpose of this article to provide a brief introduction into the technique and to discuss first experimental data. In particular, for the most common scattering geometry where the applied magnetic (guide) field is perpendicular to the incident neutron beam, we write down the equations for the non-spin-flip and spin-flip SANS cross sections of a bulk ferromagnet, and we discuss the various angular anisotropies and asymmetries along with some selected experimental results on an FeCr based soft magnetic nanocrystalline alloy. In particular, we show that the analysis of the spin-flip data allows one to obtain the magnitude-squares of the three vector (Fourier) components of the magnetization.