Kossel interferences of proton-induced X-ray emission lines to study thin film waveguides

J. P. Zhang, C. Pendenque, K. Le Guen, R. Delaunay, I. Vickridge, D. Schmaus, Q. G. Fu, P. Jonnard

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

PIXE combined in Kossel geometry was developed as a non-destructive structural characterization method of nanometer thin films deposited on Si. The method is applied to study Pt/Fe/Pt and Ta/Cr/Pt thin films designed as X-ray planar waveguides. The intensities of characteristic X-ray emissions versus the detection angle (grazing exit), called Kossel curves, were measured by an energy dispersive X-ray camera. It is found that an interfacial compound is formed in Pt/Fe/Pt waveguide, whereas oxidation and mixing occur in the Ta/Cr/Pt system. It was not possible to obtain the description of the successive layers when considering only grazing incidence x-ray reflectivity. When PIXE-Kossel experiments are considered, supplementary constraints have to be fulfilled when fitting the values of the stack parameters (number, composition, thickness, roughness and density of the layers)which restrict the possible descriptions of waveguides. Thus PIXE-Kossel is suitable to characterize stacks of nanometer thin films designed as an x-ray waveguide.

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume452
DOIs
StatePublished - 1 Aug 2019

Keywords

  • Kossel diffraction
  • PIXE
  • Thin film
  • X-ray reflectometry
  • X-ray waveguide

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