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Updated: Jun 5, 2026
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Atom Probe Tomography Studies on the Cu(In,Ga)Se2 Grain Boundaries
Published on: April 22, 2013
在脉冲激光沉积培养的Zn0.9Co0.1O薄膜中,使用原子探头断层扫描技术证明了超对磁性协集群的证据
Rodrigue Lardé1, Etienne Talbot, Philippe Pareige
1Groupe de Physique des Matériaux, UMR 6634 CNRS, Université et INSA de Rouen , Avenue de l'Université, B.P. 12, 76801 Saint Etienne du Rouvray, France. rodrigue.larde@univ-rouen.fr
Journal of the American Chemical Society
|January 7, 2011
概括
氧化物 (Co-ZnO) 薄膜中的室温铁磁性不是由集群引起的. 相反,实验证据表明,这些稀释的磁性半导体中观察到的铁磁性是由于缺陷造成的.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 稀释磁性半导体 (DMS) 对自旋电子应用具有前景.
- 添加氧化 (Co-ZnO) 是一个广泛研究的DMS材料,具有室温铁磁性.
- 铁磁在Co-ZnO的起源仍然是一个争论的主题,集群和内在缺陷是主要的候选人.
研究的目的:
- 为了研究纳米化集群在Co-ZnO薄膜铁磁性中的作用.
- 为了确定集群形成和磁性特性之间的相关性.
- 阐明Co-ZnO中室温铁磁性作用的潜在机制.
主要方法:
- 原子探头断层扫描 (APT) 用于高分辨率成像和分布的化学分析.
- 零场冷却/场冷却 (ZFC/FC) 磁化测量以研究磁放松现象.
- 磁化曲线分析以描述铁磁性行为.
主要成果:
- 使用APT.在Co-ZnO薄膜中毫不含糊地确定了纳米化集群 (大约3nm).
- 这些团的存在与ZFC/FC测量中观察到的超偏磁放松直接相关.
- 没有发现二级相的实验证据,铁磁性也不能归因于观察到的团.
结论:
- 这项研究提供了强有力的证据,证明集群不是Co-ZnO中室温铁磁性的来源.
- 这些发现强化了在Co-ZnO DMS中铁磁性是由内在缺陷引起的假设.
- 这项研究阐明了Co-ZnO中磁性的起源,指导了未来用于自旋电子应用的材料设计.
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