Neutron Reflectivity to Characterize Nanostructured Films


Neutron reflectivity is a powerful nondestructive technique to characterize thin films and nanostructured materials. This technique works equally well for various types of systems like organic, inorganic, and biological materials both in solid and liquid forms. Neutron reflectivity measurements provide information regarding the thickness and density of a thin film as a function of depth and also about the roughness of the top surface and buried interfaces. In comparison with x-ray reflectivity study, the neutron reflectivity measurements provide much improved contrast for elements with close values of atomic numbers, even for isotopes of same element. Furthermore, the detail of the in-plane spin arrangement can be obtained from polarization analysis. Neutron reflectivity is more than a complementary technique to x-ray reflectivity measurement for structural and morphological studies and is essential for the study of magnetic ordering due to its capability to measure the average magnetic moment in absolute units simultaneously with the structural information. In this chapter we discuss the theory of neutron reflectivity technique and illustrate the merit of this technique with some recent examples. We explain also the analysis techniques of neutron reflectivity data in detail. Although the nature of interaction of neutron with matter is different from that of x-ray, the basic formalism for reflectivity presented here utilizing the wave nature of thermal/cold neutrons remain valid for both measurements.

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Neutron Reflectivity to Characterize Nanostructured Films
Book Title
Magnetic Characterization Techniques for Nanomaterials
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  • Challa S.S.R. Kumar Send Email (1)
  • Editor Affiliation
  • 1 Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC), Rowland Institute of Science, Harvard University, Cambridge, Massachusetts, USA
  • Authors
  • Sirshendu Gayen Send Email (2)
  • Milan K. Sanyal Send Email (2)
  • Max Wolff Send Email (3)
  • Author Affiliation
  • 2 Surface Physics and Material Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, 700 064, Kolkata, India
  • 3 Department of Physics and Astronomy, Uppsala University, P.O. Box 516, Uppsala, SE-75120, Sweden
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