GaAs/MnAs core/shell nanowire heterostructures were synthesized by catalyst-free molecular beam epitaxy. Transmission electron microscopy (TEM) reveals that the GaAs core predominantly grows with the zinc-blende crystal structure with a  growth direction. In a small population of wires, the crystal structure transitions from zinc blende to wurtzite with a  growth direction. Cross-sectional TEM shows that the MnAs grows epitaxially on the GaAs core in the NiAs prototype structure with an epitaxial relation of [̄2021] MnAs∥ GaAs and (̄0110) MnAs∥GaAs (̄110). When the GaAs core is in the wurtzite structure, the epitaxial relation between the GaAs and MnAs changes to  MnAs∥ GaAs and (̄1210) MnAs (̄1210) GaAs.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)