Study of ZnO crystals and Zn1−xMxO (M=Co, Mn) epilayers grown by pulsed laser deposition on substrate
- 作者：Zheng ; Y. ; Boulliard ; J.C. ; Demaille ; D. ; Bernard ; Y. ; Pé ; troff ; J.F.
- 关键词：61.10.&minus ; i ; 61.72.Ff ; 68.55.&minus ; a ; 75.50.Dd ; 81.15.Fg ; A1. Defects ; A1. High-resolution X-ray diffraction ; A1. X-ray topography ; A3. Pulsed laser deposition ; B1. Zinc oxide ; B2. Magnetic materials
- 刊名：Journal of Crystal Growth
- 出版年：2005
- 期刊代码：49_00220248
- 类别：ch
- 出版时间：January 15, 2005
- 卷：274
- 期：1-2
- 页码：156-166
- 文件大小：530 K
摘要
Crystal defects in Seeded Chemical Vapour Transport (SCVT) and hydrothermal ZnO substrates were characterised mainly by X-ray topography and diffraction. Zn1−xMxO (M=Co, Mn) epilayers were grown on hydrothermal Formula Not Shown substrate by Pulsed Laser Deposition (PLD). It is shown that the epitaxy strains are partially relaxed through dislocations in the {10.0} glide planes. The crystal perfection of the epilayers was analysed by high-resolution X-ray diffraction. Almost intrinsic rocking curves were observed for Zn1−xCoxO epilayers and the c-axis parameter increases proportionally with the Co content. This suggests that Co atoms are well located at substitutional sites in the ZnO matrix. A larger distortion of the ZnO matrix is induced by the insertion of Mn atoms. A paramagnetic behaviour was observed in Zn1−xCoxO epilayers with a low proportion of active Co atoms. A weak ferromagnetic behaviour was observed only for Zn1−xCoxO epilayers when a few Al atoms (1.6%) were incorporated.