Strain in GaAs-MnAs core-shell nanowires grown by molecular beam epitaxy

M. Hilse, Y. Takagaki, M. Ramsteiner, J. Herfort, S. Breuer, L. Geelhaar, H. Riechert

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


We investigate the strain in coreshell nanowires consisting of a highly mismatched materials system of a GaAs core and a MnAs shell. The strain in the GaAs core is directly traced using Raman spectroscopy, whereas that in the MnAs shell is assessed by magnetization measurements. The Raman peak positions in the MnAs-capped nanowires are shifted in comparison to those in bare GaAs nanowires in a nonuniform manner. We theoretically explore the influence of the anisotropic strain in the coreshell nanowires on the peak shift. When the shell thickness considerably exceeds the core diameter, the shell is only weakly strained. This can be interpreted as the shell taking over the role of the rigid substrate. In addition, we evaluate the diffusion length in the MnAs growth.

Original languageEnglish (US)
Pages (from-to)307-310
Number of pages4
JournalJournal of Crystal Growth
Issue number1
StatePublished - May 15 2011

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry


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