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

T. Kasama ; Mattias Thuvander (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; A. Siusys ; L. C. Gontard ; A. Kovacs ; S. Yazdi ; M. Duchamp ; A. Gustafsson ; R. E. Dunin-Borkowski ; J. Sadowski
Journal of Applied Physics (0021-8979). Vol. 118 (2015), 5,
[Artikel, refereegranskad vetenskaplig]

Doping mechanisms of Mn in GaAs nanowires (NWs) that have been grown self-catalytically at 600 degrees 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 (22 +/- 4 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.

Denna post skapades 2015-09-03. Senast ändrad 2015-10-05.
CPL Pubid: 221879


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)



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Denna publikation är ett resultat av följande projekt:

Enabling Science and Technology through European Electron Microscopy (ESTEEM 2) (EC/FP7/312483)