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首页> 外文期刊>Physica, B. Condensed Matter >Magnetic layered structure for the production of polarized neutron microbeams
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Magnetic layered structure for the production of polarized neutron microbeams

机译：用于生产极化中子微束的磁性分层结构

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摘要

A neutron waveguide is a three-layer structure in which a guiding layer with low optical potential is placed between two cladding layers with high optical potential. Under proper operation conditions, the neutron density is resonantly enhanced inside the guiding layer. In our experimental scheme, the neutron beam enters through the surface of the top layer at glancing angle and goes out from the edge of the guiding layer, with an angular distribution corresponding to Fraunhofer diffraction from a narrow slit. The incident neutron beam is relatively wide (0.1 mm) and highly collimated (0.01°). The outgoing sub-micron beam is extremely narrow at the outlet (0.1 μm) and more divergent (0.1°). So far only the production of unpolarized sub-micron neutron beams has been reported. Here we present first experiments on polarized sub-micron neutron beams. For these studies a polarized incident beam was used and two types of magnetic waveguides were investigated: a polarizing magnetic waveguide Fe(20 nm)/Cu(140 nm)/Fe(50 nm)//glass and a non-polarizing magnetic waveguide Py(10 nm)/Al(140 nm)/Py(50 nm)//glass (Py is permalloy). The waveguide samples were characterized by polarized neutron reflectometry.
机译：中子波导是三层结构，其中具有低光势的引导层被置于具有高光势的两个包层之间。在适当的操作条件下，中子密度在引导层内部共振增强。在我们的实验方案中，中子束以掠射角进入顶层表面，并从导向层的边缘射出，其角度分布对应于弗劳恩霍夫晶体从狭窄狭缝衍射的角度。入射中子束相对较宽（0.1毫米）且高度准直（0.01°）。出射的亚微米光束在出口处非常窄（0.1μm），并且发散度更大（0.1°）。迄今为止，仅报道了非极化的亚微米中子束的产生。在这里，我们介绍极化亚微米中子束的首次实验。为了进行这些研究，使用了偏振入射光束并研究了两种类型的磁波导：偏振磁波导Fe（20 nm）/ Cu（140 nm）/ Fe（50 nm）//玻璃和非偏振磁波导Py （10 nm）/ Al（140 nm）/ Py（50 nm）//玻璃（Py是坡莫合金）。通过极化中子反射法表征波导样品。

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