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首页> 外文期刊>RSC Advances >Insight into the origin of ferromagnetism in Fe-doped ZnO diluted magnetic semiconductor nanocrystals: an EXFAS study of local structure
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Insight into the origin of ferromagnetism in Fe-doped ZnO diluted magnetic semiconductor nanocrystals: an EXFAS study of local structure

机译：洞察掺铁的ZnO稀释的磁性半导体纳米晶体中铁磁性的起源：局部结构的EXFAS研究

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摘要

In this paper we have studied the structural, local structural and magnetic properties of sol-gel derived Zn1-xFexO (0 <= x <= 0.06) nanoparticles. The crystalline structure and crystallite size have been estimated by X-ray diffraction with Rietveld refinement and high-resolution transmission electron microscopy (HRTEM). Other structural and local structural properties have been studied by extended X-ray absorption fine structure (EXAFS)-, X-ray absorption near edge structure (XANES)- and Raman-analysis. Weak ferromagnetism is observed at room temperature and magnetization increases with increasing Feconcentration. The oxygen vacancy assisted bound magnetic polarons (BMPs) and possibly the grain boundaries are responsible for this room temperature ferromagnetism. Variation of resistivity with temperature has also been studied. Appearance of ferromagnetism in ZnO : Fe nanoparticles may open the potential in bio-imaging and drug-delivery applications.
机译：在本文中，我们研究了溶胶-凝胶衍生的Zn1-xFexO（0 <= x <= 0.06）纳米粒子的结构，局部结构和磁性。晶体结构和微晶尺寸已通过Rietveld精制的X射线衍射和高分辨率透射电子显微镜（HRTEM）进行了估算。通过扩展的X射线吸收精细结构（EXAFS），近边缘结构的X射线吸收（XANES）和拉曼分析研究了其他结构和局部结构特性。在室温下观察到弱的铁磁性，并且磁化随着铁浓度的增加而增加。氧空位辅助束缚磁极化子（BMP）以及可能的晶界是造成这种室温铁磁性的原因。还研究了电阻率随温度的变化。 ZnO：Fe纳米颗粒中铁磁性的出现可能为生物成像和药物递送应用打开潜力。

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