Combined XRD and SAXS analysis of nano-magnetic materials

Nano-magnetic materials have a variety of potential applications. For example, they can be used in high density data storage and in biomedical research and clinical diagnosis. Fundamentally, it is important to understand that the nano particle size is not always the crystallite size. One particle may contain several differently oriented crystallites or domains.

In the figures below, we demonstrate the analysis of both the crystallite size and nano particle size of magnetic FePt materials. XRD is sensitive to the crystal structure; hence it is suitable for the crystallite size analysis. On the other hand, SAXS is not sensitive to the crystal structure, but the particle size. Both the XRD and SAXS analyses were performed on the SmartLab multipurpose diffractometer. The XRD and the crystallite size results are shown in Figure 1.

XRD and the crystallite size results
Figure 1

The SAXS measurement and fitting results are shown in the left panel of figure 2. The resulting particle size distribution is shown in the right panel of Figure 2.

SAXS measurement and fitting result
Figure 2

For the particular sample analyzed here, the crystallite size is identical to the particle size, 2.9 nm. This indicates that each particles contains just a single domain.

The SmartLab is the most novel high-resolution diffractometer available today. Perhaps its most novel feature is the SmartLab Guidance software, which provides the user with an intelligent interface that guides you through the intricacies of each experiment. It is like having an expert standing by your side. Read more...

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