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中子散射在磁性材料研究中的应用

Investigation of magnetic materials by neutron scattering

  • 摘要: 中子具有天然磁矩,穿透能力强且对轻元素敏感等独特的优势,是目前研究材料中磁结构最有力的工具。发展中子散射技术对开发新型磁性材料和研究磁性物理机理等方面具有重大意义。文章介绍了几种常用的中子散射技术(如粉末衍射、小角散射、反射等),并通过典型的实例来说明它们在磁性材料研究中的具体应用。针对国内介绍中子反射技术的资料相对较少,尤其是极化中子反射技术在精确定量表征薄膜磁性大小和分布方面的研究极度匮乏的现状,文章重点介绍了这一特色技术以及应用实例。

     

    Abstract: Neutron scattering is a powerful tool to investigate magnetic order in materials, because neutrons exhibit unique characteristics such as natural spin polarization, strong penetration, and sensitivity to the light elements. Thus, the development of neutron scattering technology has tremendous bearing on the discovery of new magnetic materials and novel magnetic phenomena. We introduce here three commonly used neutron scattering techniques (powder diffraction, small angle scattering, and reflectometry), and discuss their applications in the study of magnetic materials. Since there are not many references so far on polarized neutron reflectometry in China, we will emphasis the recent progress of the quantitative determination of magnetization and its depth profile in magnetic thin films and heterostructures based on this technique.

     

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