铁磁性
凝聚态物理
材料科学
磁性半导体
磁矩
氧气
磁化
居里温度
空位缺陷
兴奋剂
矫顽力
自旋极化
电子
化学物理
化学
磁场
物理
量子力学
有机化学
作者
Meng Ge,H. Wang,Enjun Liu,J. F. Liu,J.Z. Jiang,Y. K. Li,Zhu‐An Xu,Huaxun Li
摘要
Magnetic behaviors of pure CeO2 nanoparticles and nanocubes have been investigated both experimentally and theoretically. It is found that monodisperse CeO2 nanocubes with an average size of 5.3 nm do show ferromagnetic behavior at ambient temperature with a saturation magnetization of about 5.7 memu/g and coercive force of about 69 Oe. First-principles calculations reveal that oxygen vacancies in pure CeO2 cause spin polarization of f electrons for Ce ions surrounding oxygen vacancies, resulting in net magnetic moment for pure CeO2 samples. One oxygen vacancy at surface can induce more magnetic moments than those induced by one oxygen vacancy in bulk. The results obtained here provide evidence that pure CeO2 sample with oxygen vacancies can indeed have magnetic behavior. This study will stimulate more investigations for understanding the origin of ferromagnetic TM-doped CeO2 (TM=3d transition metals) in a particular case and TM-doped semiconductor oxides in general at ambient temperature.
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