通过碳热化合成的Mn/C编码的GaN纳米结构的增强铁磁性和可调节的和磁化
Zeyan Wang1, Baibiao Huang, Lin Yu
1State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China.
Journal of the American Chemical Society
|November 14, 2008
概括
碳配合增强了配合化 (GaN) 纳米结构中的铁磁性. 这项研究合成了Mn/C编码的GaN,观察了碳含量更高的磁性增加.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 固态物理 固态物理
背景情况:
- 化 (GaN) 是一种半导体,有可能用于自旋电子应用.
- 用磁性元素合GaN可以诱导铁磁性质.
- 控制纳米结构形态和磁性行为对于设备集成至关重要.
研究的目的:
- 为了合成和表征和碳编的GaN纳米结构.
- 为了研究碳配合对GaN.的形态学和铁磁性质的影响.
- 阐明碳对磁性合的影响的基本机制.
主要方法:
- 使用活性木炭进行合成的碳热化.
- 用X射线衍射 (XRD),扫描电子显微镜 (SEM) 和高分辨率传输电子显微镜 (HRTEM) 进行结构和形态分析.
- X射线光电子光谱 (XPS) 用于元素兴奋剂的确认.
- 磁化测量用于评估铁磁性质.
- 第一个原则密度函数理论 (DFT) 计算用于电子结构分析.
主要成果:
- 成功合成了Mn/C编码的GaN纳米结构,包括曲的纳米线和纳米螺丝.
- 在GaN矩阵中确认了Mn和C两种剂的存在.
- 观察到显著的室温铁磁性,与和磁化增加与C/Ga摩尔比.
- 证明Mn/C编的GaN中的铁磁性可以比Mn编的GaN强大约40倍.
- DFT的计算表明,Mn/C的编码和增强的铁磁合在能源上是有利的.
结论:
- 碳配合是调整形态和增强Mn-doped GaN纳米结构中的铁磁性的有效策略.
- 在控制和磁化方面,C/Ga摩尔比率起着至关重要的作用.
- 碳兴奋剂有利于位,并促进Mn兴奋剂之间的铁磁合,从而显著改善磁性.
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