L10-structured MnGa(111) ultra-thin films were heteroepitaxially grown on GaN(0001) under lightly Mn-rich conditions using molecular beam epitaxy. Room-temperature scanning tunneling microscopy (STM) investigations reveal smooth terraces and angular step edges, with the surface structure consisting primarily of a 2 × 2 reconstruction along with small patches of 1 × 2. Theoretical calculations were carried out using density functional theory, and the simulated STM images were calculated using the Tersoff-Hamman approximation, revealing that a stoichiometric 1 × 2 and a Mn-rich 2 × 2 surface structure give the best agreement with the observed experimental images.
REFERENCES
1.
T. J.
Nummy
, S. P.
Bennett
, T.
Cardinal
, and D.
Heiman
, Appl. Phys. Lett.
99
, 252506
(2011
).2.
S.
Mizukami
, T.
Kubota
, F.
Wu
, X.
Zhang
, T.
Miyazaki
, H.
Naganuma
, M.
Oogane
, A.
Sakuma
, and Y.
Ando
, Phys. Rev. B
85
, 014416
(2012
).3.
T.
Saito
and R.
Nishimura
, J. Appl. Phys.
112
, 083901
(2012
).4.
K. K.
Wang
, E.
Lu
, J. W.
Knepper
, F. Y.
Yang
, and A. R.
Smith
, Appl. Phys. Lett.
98
, 162507
(2011
).5.
T.
Graf
, C.
Felser
, and S.
Parker
, Prog. Solid State Chem.
39
, 1
(2011
).6.
X. Y.
Dong
, J. W.
Dong
, J. Q.
Xie
, T. C.
Shih
, S.
McKernan
, C.
Leighton
, and C. J.
Palmstrom
, J. Cryst. Growth
254
, 384
(2003
).7.
A.
Bedoya-Pinto
, C.
Zube
, J.
Malindretos
, A.
Urban
, and A.
Rizzi
, Phys. Rev. B
84
, 104424
(2011
).8.
E.
Lu
, D. C.
Ingram
, A. R.
Smith
, J. W.
Knepper
, and F. Y.
Yang
, Phys. Rev. Lett.
97
, 146101
(2006
).9.
V. P.
LaBella
, M. R.
Krause
, Z.
Ding
, and P. M.
Thibado
, Surf. Sci. Rep.
60
, 1
(2005
).10.
P.
Giannozzi
, S.
Baroni
, N.
Bonini
, M.
Calandra
, R.
Car
, C.
Cavazzoni
, D.
Ceresoli
, G. L.
Chiarotti
, M.
Cococcioni
, I.
Dabo
, A.
Dal Corso
, S.
Fabris
, G.
Fratesi
, S.
de Gironcoli
, R.
Gebauer
, U.
Gerstmann
, C.
Gougoussis
, A.
Kokalj
, M.
Lazzeri
, L.
Martin-Samos
, N.
Marzari
, F.
Mauri
, R.
Mazzarello
, S.
Paolini
, A.
Pasquarello
, L.
Paulatto
, C.
Sbraccia
, S.
Scandolo
, G.
Sclauzero
, A. P.
Seitsonen
, A.
Smogunov
, P.
Umari
, and R. M.
Wentzcovitch
, J. Phys.: Condens. Matter.
21
, 395502
(2009
).11.
J. P.
Perdew
, K.
Burke
, and M.
Ernzerhof
, Phys. Rev. Lett.
77
, 3865
(1996
).12.
K.
Laasonen
, A.
Pasquarello
, R.
Car
, C.
Lee
, and D.
Vanderbilt
, Phys. Rev. B
47
, 10142
(1993
).13.
J.
Tersoff
and D. R.
Hamman
, Phys. Rev. Lett.
50
, 1998
(1983
).14.
H.
Niida
, T.
Hori
, H.
Onodera
, Y.
Yamaguchi
, and Y.
Nakagawa
, J. Appl. Phys.
79
, 5946
(1996
).15.
A.
Sakuma
, J. Magn. Magn. Mater.
187
, 105
(1998
).16.
I.
Horcas
, R.
Fernandez
, J. M.
Gomez-Rodriguez
, J.
Colchero
, J.
Gomez-Herrero
, and A. M.
Baro
, Rev. Sci. Instrum.
78
, 013705
(2007
).© 2013 AIP Publishing LLC.
2013
AIP Publishing LLC
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