Room-Temperature Ferromagnetic Ga1-xMnxAs (x ≤ 0.05) nanowires: Dependence of electronic structures and magnetic properties on Mn content

Title
Room-Temperature Ferromagnetic Ga1-xMnxAs (x ≤ 0.05) nanowires: Dependence of electronic structures and magnetic properties on Mn content
Authors
김한성조영태공강준김창현정경복박정희김재영윤정범정명화조영훈김봉수안재평
Keywords
nanowire; Ferromagnetic; TEM
Issue Date
2009-03
Publisher
Chemistry of materials
Citation
VOL 21, NO 6, 1137-1143
Abstract
Ga1−xMnxAs nanowires were synthesized with finely controlled Mn contents (x = 0, 0.01, 0.02, 0.03, and 0.05) by the vapor transport method. They consisted of single-crystalline GaAs nanocrystals (avg. diameter = 60 nm) grown along the [111] direction. The Mn doping decreases the lattice constant, most significantly at x ≈ 0.03. X-ray photoelectron spectroscopy revealed that as the Mn content increases, the binding energy of Ga 2p shifts to a higher energy, which can be correlated with the hybridization between the Mn2+ ions and the holes. X-ray absorption spectroscopy and X-ray magnetic circular dichroism confirmed that the Mn2+ ions substitute into the tetrahedrally coordinated Ga sites and that the magnetic moment is maximized at x = 0.03, where the lattice constant is minimized and the binding energy of Ga 2p is maximized. The magnetization measurement revealed that all of these nanowires exhibited room-temperature ferromagnetic behavior, which is also observed most significantly for x ≈ 0.03.
URI
http://pubs.kist.re.kr/handle/201004/36775
ISSN
0897-4756
Appears in Collections:
KIST Publication > Article
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