Role of dopant, defect, and host oxide in the observed room temperature ferromagnetism: Co–ZnO versus Co–CeO2
Role of dopant, defect, and host oxide in the observed room temperature ferromagnetism: Co–ZnO versus Co–CeO2
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DOI：
10.1063/1.3068648
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发表时间：
2009-03
影响因子：
3.2
通讯作者：
L. Shah;Weigang Wang;Haojun Zhu;B. Ali;Yuanqiang Song;Huaiwu Zhang;S. Shah;J. Xiao
中科院分区：
文献类型：
--
作者：
L. Shah;Weigang Wang;Haojun Zhu;B. Ali;Yuanqiang Song;Huaiwu Zhang;S. Shah;J. Xiao
对Co掺杂ZnO和CeO 2体样品的室温铁磁性进行了比较研究。Co-ZnO系统通过控制施主缺陷Zn：Zn Ni在铁磁性和顺磁性之间的转换。另一方面，Co-CeO 2总是铁磁性的。然而，铁磁性增加/减少施主缺陷，氧空位：VO。系统的结构，磁性和运输分析表明，施主缺陷和主机氧化物的性质在建立铁磁性中起着至关重要的作用。这项研究提供了一个洞察的基本机制，负责在Co-ZnO和Co-CeO 2的铁磁性。磁性杂质离子和缺陷的电子结构也支持上述机制。
A comparative study on the room temperature ferromagnetism of Co doped ZnO and CeO2 bulk samples is presented. Co–ZnO system has been observed to switch between ferromagnetic and paramagnetic by controlling the donor defects, interstitial zinc: Zni. On the other hand, Co–CeO2 is always ferromagnetic. However, ferromagnetism increases/decreases with increase/decrease in donor defects, oxygen vacancies: VO. Systemic structural, magnetic, and transport analyses reveal that the nature of donor defects and host oxide plays a vital role in establishing ferromagnetism. This study provides an insight into the underlying mechanisms that are responsible for the ferromagnetism in Co–ZnO and Co–CeO2. Moreover, the proposed mechanisms are supported by the electronic structure of magnetic impurity ions and defects.