Limitations of the kinematic approximation in neutron reflectivity measurements for the analysis of bilayers
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Droulias, Sotirios A.
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Uppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, SwedenUppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, Sweden
Droulias, Sotirios A.
[1
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Palsson, Gunnar K.
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Uppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, SwedenUppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, Sweden
Palsson, Gunnar K.
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Hjorvarsson, Bjorgvin
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Uppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, SwedenUppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, Sweden
Hjorvarsson, Bjorgvin
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Wolff, Max
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Uppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, SwedenUppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, Sweden
Wolff, Max
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[1] Uppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, Sweden
The limitations of a phenomenological fitting approach compared to simulations of the optical model including reflection and refraction at all interfaces are demonstrated using the example of hydrogen loading in ultra-thin vanadium layers. Fe/V superlattices are loaded with deuterium and the lattice expansion and deuterium concentration are extracted from neutron reflectivity data. A noticeable difference is found between the extraction of concentrations and bilayer thicknesses directly from the superlattice peaks and fits of the density profile using the Parratt formalism. The results underline the importance of carefully considering the limitations of phenomenological approaches, in order to obtain robust results. The limitations of the kinematic approximation for the analysis are discussed in detail.