Fredrik Eriksson, Anton Zubayer, Naureen Ghafoor, Kristbjörg Thorarinsdottir, Sjoerd Stendahl, Artur Glavic, Jochen Stahn, Gyula Nagy, Grzegorgz Greczynski, Matthias Schwartzkopf, Arnaud Le Febvrier, Per Eklund, Fridrik Magnus, Jens Birch
Polarized neutrons are crucial for various research fields, but existing multilayer optics have limitations. By incorporating 11B4C into Fe/Si layers during deposition, we address these challenges. This method enhances reflectivity and polarization by creating smoother interfaces and optimizing scattering length density. Adding 15 at.% of 11B4C to Fe/Si multilayers improves reflectivity by 125% and polarization by 20%. It also reduces diffuse scattering and eliminates magnetic coercivity, making the layers magnetically soft. This enables saturation at low external fields. Our findings, supported by x-ray and neutron reflectivity measurements, suggest that integrating 11B4C into Fe/Si multilayers improves neutron optics, promising better performance in scattering facilities.
Ion-assisted magnetron sputter deposition have been used to deposit Ni/Ti multilayer neutron mirrors. Improved interface widths were obtained by using B4C doping, to eliminate nanocrystallites by amorphization, and a two-stage modulated ion assistance, to obtain abrupt and smooth interfaces. In situ high-energy wide angle X-ray scattering during multilayer depositions was used to monitor the microstructure evolution and to determine the most favourable growth conditions. Post growth X-ray reflectometry in combination with high resolution transmission electron microscopy confirmed the amorhization and revealed significant improvements in interface widths and reduction of kinetic roughening upon applying B4C doping and modulated ion assistance during growth. Significant improvement of neutron supermirror performance is predicted by employing this technique.
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