Applications of electron holography to the study of interfaces

J. K. Weiss, W. J. de Ruijter, M. Gajdardziska-Josifovska, Martha McCartney, David Smith

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Abstract

Electron holography has been applied to a variety of layered structures to assess its usefulness for supplying information about composition profiles across heterogeneous interfaces. The phase of the exit-surface electron wave, which to a first approximation is dependent upon the mean inner potential and the specimen thickness, was extracted from electron holograms acquired from suitable cross-sectional multilayer specimens. Line profiles from the reconstructed phase images were analyzed to obtain information about interface diffuseness and layer width with a spatial resolution of about 5 Å. Using spatial averaging parallel to the interface, increased measurement precision was obtainable in some special cases. Differences in interdiffusion widths between Mo-Si and Si-Mo interfaces in an Mo/Si multilayer structure were confirmed, and the width of the amorphous layer at Si3N4 grain boundaries was measured to be about 12 Å. It was concluded that off-axis electron holography represented a useful complementary technique for characterizing interfaces.

Original languageEnglish (US)
Pages (from-to)301-311
Number of pages11
JournalUltramicroscopy
Volume50
Issue number3
DOIs
StatePublished - Aug 1993

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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