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Nuclear magnetic resonance investigations of the structure and magnetic properties of metallic multilayers and nanocomposites

机译：核磁共振研究金属多层和纳米复合材料的结构和磁性

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摘要

As a probe of the short-range chemical and topological order, nuclear magnetic resonance (NMR) has proved useful to investigate the nanostructure of magnetic multilayers or granular systems and, in particular, to evaluate the nature, sharp or diffuse. of interfaces in such nanocomposites. These structural aspects are shortly reviewed in the paper. A larger emphasis is given to the magnetic properties that are accessed by the technique. As a first output of an NMR experiment in ferromagnets, the hyperfine field gives a direct insight on the local magnetization. Hence, for example, one can estimate the magnetization profile at a diffuse interface between a magnetic and nonmagnetic phase. In addition, NMR can probe selectively the magnetic anisotropy or exchange energy in different parts of a composite sample. Therefore NMR is a unique tool to investigate the correlation. at a local scale, between the nanostructure and the magnetic properties of a sample. For example, one can evidence the different magnetic hardness of the interface and bulk moments in multilayers, or of the magnetic clusters and alloyed regions in nanogranular alloys. Some relevant results are presented, which have been obtained in the course of investigations of Go-based multilayers, ultrathin films and granular systems. [References: 17]
机译：作为短程化学和拓扑顺序的探针，核磁共振（NMR）已被证明对研究磁性多层或粒状系统的纳米结构特别是评估尖锐或扩散性质的有用。这种纳米复合材料的界面。本文将简要回顾这些结构方面。更大的重点是该技术可以访问的磁性能。作为铁磁体中NMR实验的第一个输出，超精细场可以直接观察局部磁化强度。因此，例如，人们可以估计在磁性和非磁性相之间的扩散界面处的磁化分布。另外，NMR可以选择性地探测复合样品不同部分的磁各向异性或交换能量。因此，NMR是研究相关性的独特工具。在局部范围内，在样品的纳米结构和磁性之间。例如，可以证明多层界面或纳米颗粒合金的磁簇和合金化区域的界面磁矩和体磁矩不同。提出了一些相关的结果，这些结果是在研究基于Go的多层，超薄膜和颗粒体系的过程中获得的。 [参考：17]

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