Open AccessHeteroepitaxial growth and surface structure of L1-MnGa(111) ultra-thin films on GaN(0001)
Author(s) -
Andrada-Oana Mandru,
Reyes García-Díaz,
Kangkang Wang,
Kevin Cooper,
Muhammad Haider,
David C. Ingram,
Noboru Takeuchi,
Arthur R. Smith
Publication year - 2013
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 - 10.1063/1.4826203
Subject(s) - molecular beam epitaxy , scanning tunneling microscope , stoichiometry , materials science , thin film , density functional theory , surface reconstruction , surface structure , epitaxy , condensed matter physics , crystallography , surface (topology) , optoelectronics , chemistry , nanotechnology , computational chemistry , geometry , layer (electronics) , mathematics , physics
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.
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