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退火气氛对脉冲激光沉积制备的Zn0.92Co0.08O薄膜铁磁性的影响

发表时间:2011-05-15  浏览量:1392  下载量:680
全部作者: 何琼,王浩,汪汉斌,王喜娜,张军
作者单位: 湖北大学物理学与电子技术学院
摘 要: 采用脉冲激光沉积方法在p型Si(100)和石英玻璃衬底上用ZnCoO陶瓷靶材制备出了Zn0.92Co0.08O薄膜。采用场发射扫描电子显微镜(field emission scan electronic microscopy, FE-SEM)、X-射线衍射(X-ray diffraction, XRD)、X-射线光电子能谱(X-ray photoemission spectroscopy, XPS)、紫外-可见透过光谱仪和振动样品磁强计对样品的表面形态、结构以及磁学性质进行了测试与分析。测试结果表明:薄膜中掺杂的Co2+取代了ZnO晶格中Zn2+的位置。制备态的Zn0.92Co0.08O薄膜具有室温铁磁性并且其饱和磁化强度为6.3 emu/cm3. 当将其在真空中进行退火,饱和磁化强度提高到7.0 emu/cm3. 反之,若将其在氧气氛中进行退火,饱和磁化强度下降到4.2 emu/cm3. 霍尔效应测量进一步表明,氧空位浓度在调制稀磁半导体薄膜的铁磁性中起到了重要的作用。
关 键 词: 微电子学与固体电子学;稀磁半导体;氧化锌;钴掺杂;磁性能;缺陷
Title: Effect of annealing atmosphere on ferromagnetism of Zn0.92Co0.08O thin films prepared by pulsed laser deposition
Author: HE Qiong, WANG Hao, WANG Hanbin, WANG Xina, ZHANG Jun
Organization: Faculty of Physics and Electronics, Hubei University
Abstract: Zn0.92Co0.08O thin films were fabricated on Si(100) and quartz glass substrates by pulsed laser deposition using a ZnCoO ceramic target. The structural and magnetic properties of the films were characterized by field emission scan electronic microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), UV-visible transmission spectrum and vibrating sample magnetometer. Substitutional doping of Co2+ in ZnO lattice was demonstrated in the films. The as-prepared Zn0.92Co0.08O thin films displayed room temperature ferromagnetism with saturation magnetization of 6.3 emu/cm3. After annealing the films under vacuum, the saturation magnetization of the films increased to 7.0 emu/cm3. On the contrary, the saturation magnetization decreased to the value of 4.2 emu/cm3 after the film was annealed under oxygen atmosphere. Hall effect measurements further indicated that an oxygen vacancy mediated exchange mechanism should be responsible for ferromagnetic ordering in the diluted magnetic semiconductor films.
Key words: microelectronics and solid state electronics; diluted magnetic semiconductor; ZnO; Co-doping; magnetic property; defect
发表期数: 2011年5月第9期
引用格式: 何琼,王浩,汪汉斌,等. 退火气氛对脉冲激光沉积制备的Zn0.92Co0.08O薄膜铁磁性的影响[J]. 中国科技论文在线精品论文,2011,4(9):820-825.
 
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