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Performance of Co/Ti multilayers in a water window soft x-ray regime
Applied Optics
|October 20, 2017
Summary
Cobalt/Titanium multilayers were optimized for soft X-ray applications. The study found optimal performance around 20 bi-layers, achieving 2.5% reflectivity in the water window regime.
Area of Science:
- Materials Science
- Optics
- Condensed Matter Physics
Background:
- Multilayer coatings are crucial for manipulating X-ray beams.
- The water window (23-44 Å) is important for biological imaging.
- Optimizing multilayer reflectivity requires precise control over layer thickness and interfaces.
Purpose of the Study:
- Investigate Cobalt/Titanium (Co/Ti) multilayers for soft X-ray applications.
- Determine the optimal number of bi-layers for maximum reflectivity.
- Understand reflectivity saturation in Co/Ti multilayer systems.
Main Methods:
- DC magnetron sputtering for Co/Ti multilayer deposition.
- Grazing Incidence X-ray Reflectivity (GIXR) with hard X-rays for characterization.
- Soft X-ray reflectivity measurements using synchrotron radiation.
Main Results:
- Optimized deposition parameters for smooth Co and Ti single layers.
- GIXR showed maximum reflectivity at the first Bragg peak for 20 bi-layers.
- Achieved ~2.5% peak reflectivity at 30.7 Å wavelength using synchrotron radiation.
Conclusions:
- Co/Ti multilayers show promise for water window soft X-ray applications.
- Reflectivity saturates beyond a certain number of bi-layers, requiring further investigation.
- The study provides insights into optimizing multilayer structures for specific X-ray wavelengths.
