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首页> 外文期刊>Physica, B. Condensed Matter >Characterisation of novel magnetic materials using the USANSPOL technique
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Characterisation of novel magnetic materials using the USANSPOL technique

机译：使用USANSPOL技术表征新型磁性材料

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摘要

USANSPOL is a novel ultra-small-angle scattering technique with polarised neutrons for investigation of magnetic materials. It represents a polarised neutron extension to traditional USANS which works with unpolarised neutrons. The high angular resolution of this technique relies on the narrow reflection width of perfect crystal reflections and is employed in a double-crystal diffractometer. Corresponding to the μrad resolution of the set-up, micro-structures of the order of a few tenths of a micrometre up to a few tens of micrometres may be investigated. Neutron polarisation is achieved by insertion of birefringent magnetic prisms between the monochromator crystal and the sample. Rocking the analyser crystal produces a scattering pattern for both neutron spin states in a single measurement but well separated in reciprocal space. By this technique, we have recently studied various amorphous Galfenol soft-magnetic ribbons which were produced by spinning from melt at different manufacturing conditions. USANSPOL allows for a determination of domain sizes of the non-magnetised samples and a study of the growing of magnetically homogeneous regions with increasing externally applied magnetic field. The manufacturing process of the ribbons is reflected in the magnetic micro-structure of the different specimens.
机译：USANSPOL是一种具有极化中子的新型超小角度散射技术，用于研究磁性材料。它代表了极化中子向传统USANS的扩展，它可以与非极化中子一起工作。该技术的高角度分辨率取决于完美晶体反射的窄反射宽度，并用于双晶体衍射仪中。对应于装置的μrad分辨率，可以研究十分之几微米到几十微米的微结构。中子极化是通过在单色仪晶体和样品之间插入双折射磁棱镜来实现的。摇摆分析仪晶体会在一次测量中产生两个中子自旋状态的散射图，但在倒数空间中会很好地分开。通过这种技术，我们最近研究了各种非晶态的Galfenol软磁带，它们是通过在不同的制造条件下从熔体中纺丝而制成的。 USANSPOL可以确定未磁化样品的磁畴大小，并可以研究随着外部施加磁场的增加而增加磁均匀区域的情况。条带的制造过程反映在不同样品的磁性微观结构中。

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