کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1592791 | 1002674 | 2012 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Defects enhanced ferromagnetism in Cu-doped ZnO thin films Defects enhanced ferromagnetism in Cu-doped ZnO thin films](/preview/png/1592791.png)
We present here new evidences of point defects enhanced ferromagnetism in Cu-doped ZnO thin films by different characterization methods. Cu-doped ZnO thin films with Cu concentrations ranging from 0.05 to 5 at.% were prepared by an inductively coupled plasma enhanced physical vapor deposition system. Room-temperature ferromagnetism is observed in all the films. The saturation magnetization shows an increasing trend with the increase of Cu concentration except a slight decrease for the 1 at.% Cu-doping. Further study performed by Raman spectra, X-ray absorption spectra and extended X-ray absorption fine structure indicate the existence of Cu2+ ions and point defects in all the films. The local structural characterization and magnetic properties reveal that the sample with larger saturation magnetization has a higher concentration of point defects.
► Cu-doped ZnO thin films were prepared by an ICP-PVD deposition system.
► Room-temperature ferromagnetism is observed in all the films.
► Raman and XAS spectra indicate the existence of Cu2+ ions and point defects.
► The ferromagnetism was enhanced by point defects in the Cu-doped thin films.
Journal: Solid State Communications - Volume 152, Issue 4, February 2012, Pages 257–260