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Reconstructed Structures of Nanosized Co Islands on Ag/Ge(111) √3 × √3 Surfaces

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Abstract:

Structural evolution of Co/Ag/Ge(111) at high temperatures was studied by using scanning tunneling microscopy and low energy electron diffraction. The √3 × √3-Ag layer between the substrate Ge(111) and Co adatoms can avoid the formation of Co–Ge compounds below 800 K. The Co atoms nucleate to form islands where √13 × √13 or 2 × 2 reconstructions were observed after annealing between 373 K and 737 K. The √13 × √13 structure with mirror symmetry relative to [−211], [11-2], and [1-21] axes was observed for 1–2 layer Co islands. Co islands with over 2 layers appear 2 × 2 structure. All reconstruction structures of the nano-sized Co islands and substrate Ag/Ge(111) √3 × √3 surface were analyzed using the atomic hard sphere model. The bright protrusions of these reconstructions all sit in the centers of Ag or Ge trimers, which were predicted to have maximum binding energy.

Keywords: COBALT; GERMANIUM; LOW ENERGY ELECTRON DIFFRACTION; METAL-SEMICONDUCTOR MAGNETIC THIN FILM STRUCTURES; SCANNING TUNNELLING MICROSCOPY; SILVER

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.A045

Publication date: February 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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