Eliminating the spin-down critical angle in polarizing neutron optics for expanding the polarization bandwidth
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arXiv
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| Format: | Preprint |
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2024
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| author | Zubayer, A. Ghafoor, N. Glavic, A. Stahn, J. Lorentzon, M. Febvrier, A. Le Eklund, P. Birch, J. Eriksson, F. |
| author_facet | Zubayer, A. Ghafoor, N. Glavic, A. Stahn, J. Lorentzon, M. Febvrier, A. Le Eklund, P. Birch, J. Eriksson, F. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_04930 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Eliminating the spin-down critical angle in polarizing neutron optics for expanding the polarization bandwidth Zubayer, A. Ghafoor, N. Glavic, A. Stahn, J. Lorentzon, M. Febvrier, A. Le Eklund, P. Birch, J. Eriksson, F. Materials Science 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. |
| title | Eliminating the spin-down critical angle in polarizing neutron optics for expanding the polarization bandwidth |
| topic | Materials Science |
| url | https://arxiv.org/abs/2404.04930 |