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Self-organized nano-structuring of CoO islands on Fe(001)

Brambilla, A. ; Picone, A. ; Giannotti, D. ; Riva, M. ; Bussetti, G. ; Berti, G. ; Calloni, A. ; Finazzi, M. ; Ciccacci, F. ; Duò, L.

Applied surface science, 2016-01, Vol.362, p.374-379 [Peer Reviewed Journal]

Elsevier B.V

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  • Title:
    Self-organized nano-structuring of CoO islands on Fe(001)
  • Author: Brambilla, A. ; Picone, A. ; Giannotti, D. ; Riva, M. ; Bussetti, G. ; Berti, G. ; Calloni, A. ; Finazzi, M. ; Ciccacci, F. ; Duò, L.
  • Subjects: Auger electron spectroscopy ; Cobalt oxide ; Dislocations ; Electron spectroscopies ; Iron ; Molecular structure ; Morphology ; Nanostructure ; Networks ; Scanning tunneling microscopy ; Segregations ; Self-organization ; Variance
  • Is Part Of: Applied surface science, 2016-01, Vol.362, p.374-379
  • Notes: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Description: [Display omitted] •CoO grown on the Co(001)-p(1×1)O surface of a 5 ML thick Co layer on Fe(001).•The growth process does not induce Fe cation migration and/or oxidation.•A misfit dislocation network develops in the very early stages of CoO growth.•Such a network acts as a template for a three-dimensional CoO nanostructuration.•The dimensions of CoO wedding-cake square mounds scale linearly with thickness. The realization of nanometer-scale structures through bottom-up strategies can be accomplished by exploiting a buried network of dislocations. We show that, by following appropriate growth steps in ultra-high vacuum molecular beam epitaxy, it is possible to grow nano-structured films of CoO coupled to Fe(001) substrates, with tunable sizes (both the lateral size and the maximum height scale linearly with coverage). The growth mode is discussed in terms of the evolution of surface morphology and chemical interactions as a function of the CoO thickness. Scanning tunneling microscopy measurements reveal that square mounds of CoO with lateral dimensions of less than 25nm and heights below 10 atomic layers are obtained by growing few-nanometers-thick CoO films on a pre-oxidized Fe(001) surface covered by an ultra-thin Co buffer layer. In the early stages of growth, a network of misfit dislocations develops, which works as a template for the CoO nano-structuring. From a chemical point of view, at variance with typical CoO/Fe interfaces, neither Fe segregation at the surface nor Fe oxidation at the buried interface are observed, as seen by Auger electron spectroscopy and X-ray Photoemission Spectroscopy, respectively.
  • Publisher: Elsevier B.V
  • Language: English
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