Effect of oxygen defects on ferromagnetic of undoped ZnO
Effect of oxygen defects on ferromagnetic of undoped ZnO
复制标题
氧缺陷对未掺杂ZnO铁磁性的影响
DOI：
10.1063/1.3601107
复制
发表时间：
2011-07-01
影响因子：
3.2
通讯作者：
Tang, Xiaodong
中科院分区：
文献类型：
--
作者：
Liu, Weijing;Li, Wenwu;Tang, Xiaodong
采用溶液法合成了Mn掺杂ZnO纳米粒子，并分别在N2、O2和Ar中退火。x射线衍射和x射线光电子能谱测量表明，样品具有典型的纤锌矿结构，不含其他杂质相。测量了ZnO样品的磁化回路，并清楚地显示出典型的铁磁饱和行为。采用基于光致发光光谱的缺陷分析和第一性原理计算相结合的方法，研究了Mn掺杂ZnO中可能存在的磁性缺陷中心，研究了缺陷对ZnO铁磁性性质和来源的影响。结果表明，在Mn掺杂ZnO体系中，氧空位，特别是单离子氧空位在介导铁磁性中起着至关重要的作用。
Mn doped ZnO nano-particles were synthesized by a solution route and annealed in N2, O2, and Ar, respectively. X-ray diffraction and X-ray photoelectron spectroscopy measurements show that the samples possess typical wurtzite structure and have no other impurity phases. Magnetization loops for ZnO samples were measured and clearly show typical ferromagnetic saturation behavior. With the combination of defect analysis based on photoluminescence spectroscopy and first-principle calculations of the possible magnetic defect centers in Mn doped ZnO, the effect of defects on the nature and origin of ferromagnetism was investigated. The results suggest oxygen vacancies, especially singly ionized oxygen vacancies, play a crucial role in mediating ferromagnetism in the Mn doped ZnO system.