Limitations of the kinematic approximation in neutron reflectivity measurements for the analysis of bilayers

被引：0

作者：

Droulias, Sotirios A. ^{[1
]}

Palsson, Gunnar K. ^{[1
]}

Hjorvarsson, Bjorgvin ^{[1
]}

Wolff, Max ^{[1
]}

机构：

[1] Uppsala Univ, Div Mat Phys, Dept Phys & Astron, Box 516, SE-75121 Uppsala, Sweden

来源：

JOURNAL OF APPLIED CRYSTALLOGRAPHY | 2018年 / 51卷

关键词：

neutron reflectivity; superlattices; deuterium; volume expansion; Parratt's algorithm; STRAIN;

D O I：

10.1107/S1600576718013092

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：1556 / 1563

页数：8

共 14 条

[1] Influence of boundaries on magnetic ordering in Fe/V superlattices [J].

Ahlberg, Martina ;

Marcellini, Moreno ;

Taroni, Andrea ;

Andersson, Gabriella ;

Wolff, Maximilian ;

Hjorvarsson, Bjorgvin .

PHYSICAL REVIEW B, 2010, 81 (21)

[2] Influence of compressive biaxial strain on the hydrogen uptake of ultrathin single-crystal vanadium layers [J].

Andersson, G ;

Hjorvarsson, B ;

Isberg, P .

PHYSICAL REVIEW B, 1997, 55 (03) :1774-1781

[3]

[Anonymous], 2001, ELEMENTS MODERN XRAY

[4] GenX:: an extensible X-ray reflectivity refinement program utilizing differential evolution [J].

Bjorck, Matts ;

Andersson, Gabriella .

JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2007, 40 :1174-1178

[5]

De Jeu W.H., 2016, Basic X-ray scattering for soft matter

[6] Crystal perfection by strain engineering: The case of Fe/V (001) [J].

Droulias, S. A. ;

Palsson, G. K. ;

Palonen, H. ;

Hasan, A. ;

Leifer, K. ;

Kapaklis, V. ;

Hjorvarsson, B. ;

Wolff, M. .

THIN SOLID FILMS, 2017, 636 :608-614

[7] Growth of epitaxial Fe/V(001) superlattice films [J].

Isberg, P ;

Hjorvarsson, B ;

Wappling, R ;

Svedberg, EB ;

Hultman, L .

VACUUM, 1997, 48 (05) :483-489

[8] Magnetic superlattices with variable interlayer exchange coupling:: A new approach for the investigation of low-dimensional magnetism -: art. no. 037202 [J].

Leiner, V ;

Westerholt, K ;

Blixt, AM ;

Zabel, H ;

Hjörvarsson, B .

PHYSICAL REVIEW LETTERS, 2003, 91 (03) :1-037202

[9] Deuterium-induced volume expansion in Fe0.5V0.5/V superlattices [J].

Palsson, Gunnar K. ;

Kapaklis, Vassilios ;

Dura, Joseph A. ;

Jacob, Julie ;

Jayanetti, Sumedha ;

Rennie, Adrian R. ;

Hjorvarsson, Bjorgvin .

PHYSICAL REVIEW B, 2010, 82 (24)

[10] ANOMALOUS DISPERSION AND SCATTERING OF X-RAYS [J].

PARRATT, LG ;

HEMPSTEAD, CF .

PHYSICAL REVIEW, 1954, 94 (06) :1593-1600

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