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

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.

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.