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arXiv 1210.4698cond-mat.mtrl-sci
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Mn掺杂铁磁ZnO薄膜的结构、形貌、光学和磁性

Structural, Morphological, Optical and Magnetic Property of Mn doped Ferromagnetic ZnO thin film

R. Karmakar, S. K. Neogi, Aritra Banerjee, S. Bandyopadhyay

摘要:

采用溶胶-凝胶法制备了Zn_(1-x)Mn_xO(0 < x < 0.05)薄膜,并对其结构、光学和磁学性质进行了分析。膜是单相的性质,并没有形成任何第二相已检测到从结构分析。从形态学研究中也证实了这些薄膜中没有磁性杂质相。随着Mn掺杂浓度的增加,晶格常数和晶胞体积有增加的趋势。Mn 2+离子的掺入在系统中引入无序。这也导致随着掺杂的增加,薄膜的结晶质量略有下降。晶粒尺寸随Mn掺杂比例的增加而减小。带隙随掺杂浓度的增加而发生红移,局域态宽度随掺杂浓度的增加而增大。这是由于杂质带的形成和Mn原子的俘获导致禁带内缺陷态的产生。光致发光(PL)光谱显示出随着Mn掺杂的增加,激子和缺陷相关峰的强度逐渐降低。5at%Mn掺杂的ZnO薄膜在室温下也具有缺陷介导的内禀铁磁性。反铁磁(AFM)相互作用的强烈存在减少了所观察到的铁磁矩。

英文摘要:

The structural, optical and magnetic properties of the Zn1-xMnxO (0 < x < 0.05) thin films synthesized by sol-gel technique have been analyzed in the light of modification of the electronic structure and disorder developed in the samples due to Mn doping. The films are of single phase in nature and no formation of any secondary phase has been detected from structural analysis. Absence of magnetic impurity phase in these films confirmed from morphological study also. Increasing tendency of lattice parameters and unit cell volume has been observed with increasing Mn doping concentration. The incorporation of Mn2+ ions introduces disorder in the system. That also leads to slight degradation in crystalline quality of the films with increasing doping. The grain size reduces with increase in Mn doping proportion. The band gaps shows red shift with doping and the width of localized states shows an increasing tendency with doping concentration. It is due to the formation of impurity band and trapping of Mn atoms, which leads to the generation of the defect states within the forbidden band. Photoluminescence (PL) spectra shows gradual decrease of intensity of exitonic and defect related peaks with increasing Mn doping. Defect mediated intrinsic ferromagnetism has been observed even at room temperaturenfor 5at% Mn doped ZnO film. The strong presence of antiferromagnetic (AFM) interaction reduces the observed ferromagnetic moments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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