Room-Temperature Ferromagnetic Ga1-xMnAs (x <= 0.05) Nanowires: Dependence of Electronic Structures and Magnetic Properties on Mn Content
- Authors
- Kim, Han Sung; Cho, Yong Jae; Kong, Kang Jun; Kim, Chang Hyun; Chung, Gyeong Bok; Park, Jeunghee; Kim, Jae-Young; Yoon, Jungbum; Jung, Myung-Hwa; Jo, Younghun; Kim, Bongsoo; Ahn, Jae-Pyoung
- Issue Date
- 24-3월-2009
- Publisher
- AMER CHEMICAL SOC
- Citation
- CHEMISTRY OF MATERIALS, v.21, no.6, pp.1137 - 1143
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY OF MATERIALS
- Volume
- 21
- Number
- 6
- Start Page
- 1137
- End Page
- 1143
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/120408
- DOI
- 10.1021/cm8033388
- ISSN
- 0897-4756
- 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.
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Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
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