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Micro X-ray diffraction analysis of thin films using grazing-exit conditions.

T Noma1, A Iida

  • 1Canon Research Center, Morinosato-Wakamiya, Atsugi, Kanagawa 243-01, Japan.

Journal of Synchrotron Radiation
|July 21, 2004
PubMed
Summary

A new hard X-ray microbeam technique enhances thin-film analysis by optimizing spatial resolution and surface sensitivity. This method improves signal-to-background ratios for precise material characterization.

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Area of Science:

  • Materials Science
  • Crystallography
  • Surface Science

Background:

  • Thin-film analysis is crucial for material characterization.
  • Existing X-ray diffraction techniques may lack optimal spatial resolution and surface sensitivity.

Purpose of the Study:

  • To develop an advanced X-ray diffraction technique for thin-film analysis.
  • To enhance spatial resolution and surface sensitivity in X-ray diffraction measurements.

Main Methods:

  • Utilized a hard X-ray microbeam technique.
  • Employed Kirkpatrick-Baez optics and a multilayer monochromator for X-ray focusing.
  • Focused X-ray beam size achieved was approximately 10 x 10 micrometers.
  • Experiments involved measuring X-ray diffraction patterns of Palladium (Pd), Platinum (Pt), and their layered structures.

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Main Results:

  • Optimized spatial resolution and surface sensitivity were achieved by using a large glancing angle for the X-ray microbeam and a small grazing exit angle for signal detection.
  • A small exit angle improved the signal-to-background ratio due to a reduced escape depth of X-rays.
  • Observed refraction effects of diffracted X-rays under grazing-exit conditions, confirming surface sensitivity.

Conclusions:

  • The developed hard X-ray microbeam technique offers improved spatial resolution and surface sensitivity for thin-film analysis.
  • The grazing-exit condition is effective in enhancing signal-to-background ratios and probing surface layers.
  • The technique demonstrates potential for detailed characterization of thin films and layered structures.