Polarized neutron scattering is a very important analysis technique for studies of magnetism, spintronics, and high-sensitivity measurements, among others, offering invaluable information. Yet, the efficiency of such experiments rely on the performance of the polarizing neutron optics to provide high reflectivity and polarization. Presently, state-of-the-art polarizers like Fe/Si supermirrors are not able to polarize neutrons at low scattering angles in a monochromatic beam or able to polarize neutrons with a variety of wavelengths as for a non-monochromatic beam. To overcome this limitation, it is suggested to use Co/Ti multilayers on Ti substrates owing to their favorable scattering length density characteristics. It is shown that this approach enables a wavelength bandwidth several times larger than achievable with state-of-the-art materials on Si or glass substrates. Consequently, enabling the possibility of polarizing neutrons across an extended wavelength range, including those with very high wavelengths.
@article{arxiv.2404.04930,
title = {Eliminating the spin-down critical angle in polarizing neutron optics for expanding the polarization bandwidth},
author = {A. Zubayer and N. Ghafoor and A. Glavic and J. Stahn and M. Lorentzon and A. Le Febvrier and P. Eklund and J. Birch and F. Eriksson},
journal= {arXiv preprint arXiv:2404.04930},
year = {2024}
}