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Direct observation of doping incorporation pathways in self-catalytic GaMnAs nanowires

AutorKasama, Takeshi; Thuvander, M.; Siusys, A.; Gontard, Lionel C. ; kovács, A.; Yazdi, S.; Duchamp, Martial; Gustafsson, A.; Dunin-Borkowski, Rafal E.; Sadowski, J.
Fecha de publicación2015
EditorAmerican Institute of Physics
CitaciónJournal of Applied Physics
ResumenDoping mechanisms of Mn in GaAs nanowires (NWs) that have been grown self-catalytically at 600 C by molecular beam epitaxy (MBE) are investigated using advanced electron microscopy techniques and atom probe tomography. Mn is found to be incorporated primarily in the form of non-magnetic tetragonal Ga0.82Mn0.18 nanocrystals in Ga catalyst droplets at the ends of the NWs, while trace amounts of Mn (2264 at. ppm) are also distributed randomly in the NW bodies without forming clusters or precipitates. The nanocrystals are likely to form after switching off the reaction in the MBE chamber, since they are partially embedded in neck regions of the NWs. The Ga0.82Mn0.18 nanocrystals and the low Mn concentration in the NW bodies are insufficient to induce a ferromagnetic phase transition, suggesting that it is difficult to have high Mn contents in GaAs even in 1-D NW growth via the vapor-liquid-solid process
Versión del editorhttp://dx.doi.org/10.1063/1.4927623
URIhttp://hdl.handle.net/10261/121373
DOI10.1063/1.4927623
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