Effect of oxygen deficiency on room temperature ferromagnetism in Co doped ZnO

被引：53
|
作者：
Gu, Hao [1 ]
Zhang, Wen [2 ]
Xu, Yongbing [2 ]
Yan, Mi [1 ]
机构：
[1] Zhejiang Univ, Dept Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China
[2] Univ York, Dept Elect, York Lab Spintron & Nanodevices, York YO10 5DD, N Yorkshire, England
来源：
APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 20期
基金：
中国国家自然科学基金;
关键词：
DILUTED MAGNETIC SEMICONDUCTOR;
D O I：
10.1063/1.4717741
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigated the correlation between magnetization and oxygen vacancies in Zn0.95Co0.05O nanoparticles. Enhanced magnetizations were found in SiO2 nanopowders and carbon nanotubes (CNTS) treated Zn0.95Co0.05O, which are attributed to minimizing nanoparticle size and increasing oxygen vacancy concentration. After oxygen annealing, the magnetization of both non-treated Zn0.95Co0.05O and CNTS treated Zn0.95Co0.05O decreased sharply with the filling of the oxygen vacancies, while the SiO2 treated Zn0.95Co0.05O was influenced little as the amorphous SiO2 shell prevents the diffusion of oxygen into magnetic particles. It demonstrated that the ferromagnetism comes from the interfacial oxygen deficiency and is tunable by changing the oxygen vacancies. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4717741]
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页数：4
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