Open AccessIdentification of the interstitial Mn site in ferromagnetic (Ga,Mn)As
Author(s) -
T. A. L. Lima,
U. Wahl,
V. Augustyns,
D.J. Silva,
Ângelo Costa,
Kelly Houben,
K. W. Edmonds,
B. L. Gallagher,
R. P. Campion,
M. J. Van Bael,
M. R. da Silva,
J. G. Correia,
João P. Araújo,
K. Temst,
A. Vantomme,
L. M. C. Pereira
Publication year - 2015
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.4905556
Subject(s) - ferromagnetism , interstitial defect , manganese , crystallography , annealing (glass) , materials science , lattice (music) , condensed matter physics , chemistry , physics , metallurgy , doping , acoustics
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.
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