Room-Temperature Ferromagnetic Ga1-xMnAs (x <= 0.05) Nanowires: Dependence of Electronic Structures and Magnetic Properties on Mn Content
- Title
- Room-Temperature Ferromagnetic Ga1-xMnAs (x <= 0.05) Nanowires: Dependence of Electronic Structures and Magnetic Properties on Mn Content
- Date Issued
- 2009-03
- Publisher
- AMER CHEMICAL SOC
- 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 approximate to 0.03. X-ray pholoelectron 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 approximate to 0.03.
- Keywords
- SEMICONDUCTOR; GAAS; (GA,MN)AS; SPINTRONICS; INJECTION; GROWTH
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29028
- DOI
- 10.1021/CM8033388
- ISSN
- 0897-4756
- Article Type
- Article
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- There are no files associated with this item.
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