Low d-spacing titanium-based multilayers for neutrons

Pierre Boher; Philippe Houdy; Andreas Magerl; K. Yamada; Yasuo Endoh; P. Ruterana

doi:10.1117/12.130620

23 November 1992 Low d-spacing titanium-based multilayers for neutrons

Pierre Boher, Philippe Houdy, Andreas Magerl, K. Yamada, Yasuo Endoh, P. Ruterana

Proceedings Volume 1738, Neutron Optical Devices and Applications; (1992) https://doi.org/10.1117/12.130620
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

The number of bilayers required in a neutron multilayer mirror depends directly on the different scattering cross sections of the materials selected for this purpose. So, conventional systems generally alternate two metallic systems: one with a high scattering cross section like Ni and one with a negative cross section like Ti. In this study, we show that more complicated systems such as TiN/Ti have improved potentials compared to conventional systems, due to the high scattering cross section of nitrogen. We present an experimental study of this new system using a pseudo-reactive rf-sputtering system and different in-situ and ex-situ characterization methods. Well-defined multi-layer structures are obtained with periodicities in the range 20 - 70 angstroms. Titanium and titanium nitride layers appear crystallized even for very low thickness. This induces a quite high interface roughness as observed by grazing x-ray reflection and transmission electron microscopy. Long range roughness appears limited and neutron reflectivity measured with cold neutrons ((lambda) equals 3.96 angstroms) is promising even for short periods around 40 angstroms.

Citation Download Citation

Pierre Boher, Philippe Houdy, Andreas Magerl, K. Yamada, Yasuo Endoh, and P. Ruterana "Low d-spacing titanium-based multilayers for neutrons", Proc. SPIE 1738, Neutron Optical Devices and Applications, (23 November 1992); https://doi.org/10.1117/12.130620

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