Influence of the Geometry on the Structural Characteristics of Granular and Amorphous Microwires

摘要

The microstructural characteristics of granular and amorphous glass coated microwires are studied considering their geometry, which is connected to the fabrication conditions. In the case of granular microwires the existing Cu, Fe or Co phases (with crystallite sizes around 40nm) clearly depend on the ratio between the diameters of the metallic core and the external one of the layer. The scattering patterns of amorphous microwires consist of a complex superposition of halos corresponding to structural correlations in the pyrex layer and in the metallic core. Their normalization to absolute units shows that the higher the size of the core the higher the intensity (and hence the number of structural correlations there). Small changes can be detected in the short range order in the glassy core.