Open AccessIron on GaN(0001) pseudo-1 × 1 (1+112) investigated by scanning tunneling microscopy and first-principles theory
Author(s) -
Wenzhi Lin,
Andrada-Oana Mandru,
Arthur R. Smith,
Noboru Takeuchi,
Hamad Albrithen
Publication year - 2014
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 - 10.1063/1.4874607
Subject(s) - monolayer , scanning tunneling microscope , scanning electron microscope , substrate (aquarium) , materials science , diffraction , electron diffraction , dimer , crystallography , deposition (geology) , atmospheric temperature range , condensed matter physics , molecular physics , chemistry , nanotechnology , optics , physics , thermodynamics , paleontology , oceanography , organic chemistry , sediment , composite material , biology , geology
We have investigated sub-monolayer iron deposition on atomically smooth GaN(0001) pseudo-1 × 1 (1+112). The iron is deposited at a substrate temperature of 360 °C, upon which reflection high energy electron diffraction shows a transformation to a 3×3-R30° pattern. After cooling to room temperature, the pattern transforms to a 6 × 6, and scanning tunneling microscopy reveals 6 × 6 reconstructed regions decorating the GaN step edges. First-principles theoretical calculations have been carried out for a range of possible structural models, one of the best being a Ga dimer model consisting of 2/9 monolayer of Fe incorporated into 7/3 monolayer of Ga in a relaxed but distorted structure.
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