| CdS:Mn/SiO2复合纳米颗粒的反常的磁学特性 |
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| 引用本文： | 赵普琴,薛洪涛.CdS:Mn/SiO2复合纳米颗粒的反常的磁学特性[J].原子与分子物理学报,2009,26(5):848-852. |
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| 作者姓名： | 赵普琴 薛洪涛 |
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| 作者单位： | 1. 南京工业大学理学院应用物理系,南京,210009
2. 南京邮电大学应用物理系,南京,210003 |
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| 基金项目： | 南京邮电大学青蓝计划（NY207097）资助项目 |
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| 摘 要： | 采用反胶束法，合成了硅土包裹的Mn2+掺杂的CdS纳米颗粒。利用高分辨透射电镜(HRTEM)和电子自旋共振谱 (EPR) 对这些纳米颗粒的结构进行了表征。利用超导量子干涉磁力计（SQUID）测量了这些纳米颗粒在低温下的磁学特性。研究结果表明：扩散在硅土基质中的CdS:Mn纳米颗粒的磁滞回线相对于磁场轴有明显的偏移，而有致密包裹层SiO2的CdS:Mn纳米颗粒却使磁滞回线的偏移消失，对于磁性纳米颗粒在磁化过程中出现的这一奇特的现象进行了合理的解释。
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| 关 键 词： | 纳米晶 CdS:Mn2+/SiO2 磁学特性 磁滞回线 |
| 收稿时间： | 7/9/2009 12:00:00 AM |
Anomalous magnetic behaviour of CdS:Mn/SiO2 nanocomposites |
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| Zhao Pu-Qin and Xue Hong-Tao.Anomalous magnetic behaviour of CdS:Mn/SiO2 nanocomposites[J].Journal of Atomic and Molecular Physics,2009,26(5):848-852. |
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| Authors: | Zhao Pu-Qin and Xue Hong-Tao |
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| Institution: | Department of Applied Physics, Nanjing University of Technology,Department of Applied Physics, College of Mathematics & Physics, Nanjing University of Post &Telecommunication |
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| Abstract: | Silica-overcoated CdS nanocrystals doped with Mn2+ ions were synthesized by a reverse-micelle method. Structural characterization of the nanoparticles was carried out with high resolution transmission electron microscopy (HRTEM) and the electron paramagnetic resonance (EPR) and their magnetic properties were measured by superconducting quantum interference device (SQUID) magnetometry at lower temperature. The result of measurement indicates that as-synthesized nanocrystals dispersed in a silica matrix exhibit obvious shift of the hysteresis loop toward the field direction, however, the nanocrystals coated with compact SiO2 shell display symmetric hysteresis loop. The reasonable explain are presented for the unusual phenomenon during magnetization process. |
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| Keywords: | Nanocrystals CdS:Mn2+/SiO2 magnetic properties hysteresis loop |
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