TY - JOUR
T1 - Strain in GaAs-MnAs core-shell nanowires grown by molecular beam epitaxy
AU - Hilse, M.
AU - Takagaki, Y.
AU - Ramsteiner, M.
AU - Herfort, J.
AU - Breuer, S.
AU - Geelhaar, L.
AU - Riechert, H.
PY - 2011/5/15
Y1 - 2011/5/15
N2 - 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.
AB - 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.
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U2 - 10.1016/j.jcrysgro.2010.10.126
DO - 10.1016/j.jcrysgro.2010.10.126
M3 - Article
AN - SCOPUS:79958018942
SN - 0022-0248
VL - 323
SP - 307
EP - 310
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 1
ER -