Room-Temperature Ferromagnetic Ga1-xMnAs (x ≤ 0.05) Nanowires: Dependence of Electronic Structures and Magnetic Properties on Mn Content

被引：25

作者：

Kim, Han Sung ^{[1
]}

Cho, Yong Jae ^{[1
]}

Kong, Kang Jun ^{[1
]}

Kim, Chang Hyun ^{[1
]}

Chung, Gyeong Bok ^{[1
]}

Park, Jeunghee ^{[1
]}

Kim, Jae-Young ^{[2
]}

Yoon, Jungbum ^{[3
]}

Jung, Myung-Hwa ^{[3
]}

Jo, Younghun ^{[3
]}

Kim, Bongsoo ^{[4
]}

Ahn, Jae-Pyoung ^{[5
]}

机构：

[1] Korea Univ, Dept Chem, Jochiwon 339700, South Korea

[2] POSTECH, Pohang Accelerator Lab, Pohang 790784, South Korea

[3] Korea Basic Sci Inst, Quantum Mat Res Team, Taejon 305333, South Korea

[4] Korea Adv Inst Sci & Technol, Dept Chem, Taejon 305701, South Korea

[5] Korea Inst Sci & Technol, Adv Anal Ctr, Seoul 136791, South Korea

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 06期

关键词：

GAAS; SEMICONDUCTOR; (GA; MN)AS; INJECTION; GROWTH;

D O I：

10.1021/cm8033388

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：1137 / 1143

页数：7

共 42 条

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