Measurement of electronic structure at nanoscale solid-solid interfaces by surface-sensitive electron spectroscopy

We explore the use of electron spectroscopy that samples the near-surface region of a crystal to study the electronic structure at the buried interfaces between two dissimilar transition-metal oxides. The interface is probed by comparing experimental ultraviolet photoelectron spectra to model spectr...

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Bibliographic Details
Published in:Applied physics letters 2008-01, Vol.92 (1)
Main Authors: Wang, Hui-Qiong, Altman, Eric I., Henrich, Victor E.
Format: Article
Language:English
Subjects:
COBALT OXIDES
CRYSTAL GROWTH
CRYSTALS
ELECTRONIC STRUCTURE
INTERFACES
IRON OXIDES
LAYERS
MATERIALS SCIENCE
MOLECULAR BEAM EPITAXY
NANOSTRUCTURES
NICKEL OXIDES
PHOTOELECTRON SPECTROSCOPY
ULTRAVIOLET RADIATION
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Summary:We explore the use of electron spectroscopy that samples the near-surface region of a crystal to study the electronic structure at the buried interfaces between two dissimilar transition-metal oxides. The interface is probed by comparing experimental ultraviolet photoelectron spectra to model spectra and by taking sequential differences between the experimental spectra as one oxide is grown on another. Using (100) Fe3O4–NiO and Fe3O4–CoO interfaces grown by molecular beam epitaxy, we show that there is a much higher density of electronic states at the Fe3O4–CoO interface than at the Fe3O4–NiO interface. The origin of this difference is discussed.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2831000