Diffraction at GaAs/Fe3Si core/shell nanowires: The formation of nanofacets

B. Jenichen, M. Hanke, M. Hilse, J. Herfort, A. Trampert, S. C. Erwin

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4 Scopus citations


GaAs/Fe3Si core/shell nanowire structures were fabricated by molecular-beam epitaxy on oxidized Si(111) substrates and investigated by synchrotron x-ray diffraction. The surfaces of the Fe3Si shells exhibit nanofacets. These facets consist of well pronounced Fe3Si{111} planes. Density functional theory reveals that the Si-terminated Fe3Si{111} surface has the lowest energy in agreement with the experimental findings. We can analyze the x-ray diffuse scattering and diffraction of the ensemble of nanowires avoiding the signal of the substrate and poly-crystalline films located between the wires. Fe3Si nanofacets cause streaks in the x-ray reciprocal space map rotated by an azimuthal angle of 30° compared with those of bare GaAs nanowires. In the corresponding TEM micrograph the facets are revealed only if the incident electron beam is oriented along [1 1 0] in accordance with the x-ray results. Additional maxima in the x-ray scans indicate the onset of chemical reactions between Fe3Si shells and GaAs cores occurring at increased growth temperatures.

Original languageEnglish (US)
Article number055108
JournalAIP Advances
Issue number5
StatePublished - May 1 2016

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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