Spectroscopic and magnetic properties of Mn doped GaN epitaxial films grown by plasma assisted molecular beam epitaxy
authors Vidyasagar, R; Lin, YT; Tu, LW
journal MATERIALS RESEARCH BULLETIN
author keywords Nitrides; Epitaxial growth; Raman spectroscopy; Magnetic properties; Optical properties
keywords ROOM-TEMPERATURE; TRANSPORT-PROPERTIES; FERROMAGNETISM; SEMICONDUCTOR; ELECTRONICS; BEHAVIOR; SPIN
abstract Spectroscopic and magnetic properties of Mn doped GaN, and GaN epitaxial films have been investigated by employing micro-photoluminescence, micro-Raman, and temperature dependent magnetoresistance measurements. The HR-XRD profiles have shown that the epitaxial films are in hexagonal wurtzite structures. Morphology and composition of the films have been examined by field emission scanning electron microscopy, and energy-dispersive X-ray analysis. Micro-photoluminescence spectrum displayed a dominant near band edge emission at 362 nm, which is assigned to near band edge transition within the hexagonal structure of GaN. Raman scattering profiles showed a new vibrational mode at 578 cm(-1), which is attributed to the vacancy-related local vibrational mode of Mn occupying the Ga site. Temperature dependent negative magnetoresistance measurements provide a direct evidence of magnetic ordering below 50 K for the Mn doped GaN thin film. (C) 2012 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0025-5408
year published 2012
volume 47
issue 12
beginning page 4467
ending page 4471
digital object identifier (doi) 10.1016/j.materresbull.2012.09.050
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000313851200087
link http://dx.doi.org/10.1016/j.materresbull.2012.09.050
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