Identification of the interstitial Mn site in ferromagnetic (Ga,Mn)As

We determined the lattice location of Mn in ferromagnetic (Ga,Mn)As using the electron emission channeling technique. We show that interstitial Mn occupies the tetrahedral site with As nearest neighbors (TAs) both before and after thermal annealing at 200 °C, whereas the occupancy of the tetrahedral...

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Bibliographic Details
Published in:Applied physics letters 2015-01, Vol.106 (1)
Main Authors: Lima, T. A. L., Wahl, U., Augustyns, V., Silva, D. J., Costa, A., Houben, K., Edmonds, K. W., Gallagher, B. L., Campion, R. P., Van Bael, M. J., da Silva, M. R., Correia, J. G., Araújo, J. P., Temst, K., Vantomme, A., Pereira, L. M. C.
Format: Article
Language:English
Subjects:
ANNEALING
Applied physics
CHANNELING
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON EMISSION
FERROMAGNETIC MATERIALS
FERROMAGNETISM
GALLIUM ARSENIDES
INTERSTITIALS
MANGANESE ARSENIDES
MANGANESE COMPLEXES
VISIBLE RADIATION
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Summary:We determined the lattice location of Mn in ferromagnetic (Ga,Mn)As using the electron emission channeling technique. We show that interstitial Mn occupies the tetrahedral site with As nearest neighbors (TAs) both before and after thermal annealing at 200 °C, whereas the occupancy of the tetrahedral site with Ga nearest neighbors (TGa) is negligible. TAs is therefore the energetically favorable site for interstitial Mn in isolated form as well as when forming complexes with substitutional Mn. These results shed new light on the long standing controversy regarding TAs versus TGa occupancy of interstitial Mn in (Ga,Mn)As.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4905556