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Figure 2
Penetration depth D of neutrons as a function of αi/αc. The exemplar curve has been calculated for the cubic chiral magnet Fe0.75Co0.25Si at a neutron wavelength of 5 Å, resulting in a critical angle of αc = 0.37°. Depending on the material species, the absolute values of D and αi/αc will vary and can be determined from equations (1)[link] and (2)[link]. For αi/αc = 1, neutrons begin to undergo small-angle scattering within the bulk volume of the film in the NS-SANS regime. For increasingly larger incident angles, such that αi/αc > 1, the penetration depth of neutrons into the sample is greatly enhanced and NS-SANS measurements can be optimized towards bulk sensitivity in the range of 104 nm below the sample surface.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 4| August 2025| Pages 1455-1461
https://doi.org/10.1107/S1600576725005503
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