Defect-Mediated Magnetism in Pure CaO Nanopowders

被引：46

作者：

Gao, Daqiang ^{[1
]}

Li, Jinyun ^{[1
]}

Li, Zhuoxin ^{[1
]}

Zhang, Zhaohui ^{[1
]}

Zhang, Jing ^{[1
]}

Shi, Huigang ^{[1
]}

Xue, Desheng ^{[1
]}

机构：

[1] Lanzhou Univ, Key Lab Magnetism & Magnet Mat MOE, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 27期

关键词：

OXIDES;

D O I：

10.1021/jp911957j

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：

The intrinsic nature of ferromagnetism in CaO nanopowders has been established with the experimental observation of magnetic hysteresis loop at room temperature. On the basis of the results of X-ray diffraction, magnetic properties, positron annihilation lifetime spectra, and first-principles calculations, it is found that there are correlations among the lattice constant, the defect concentration, and the magnetization of CaO nanopowders, which suggests that Ca defects are the main reason for the magnetic order and the defect concentration is related with the ferromagnetism. Such a ferromagnet without the presence of any transition metal could be a very good option for a class of spintronics.

引用

页码：11703 / 11707

页数：5

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