کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1786341 | 1023413 | 2014 | 5 صفحه PDF | دانلود رایگان |
• Single-crystalline Zn1−xCoxO films grown by molecular beam epitaxy.
• Observation of local vibration mode at 723 cm−1 by Co substitution in ZnO.
• Observation of oxygen vacancy combined local vibration mode at 699 cm−1.
Raman scattering spectroscopy has been performed on high quality Co-doped ZnO epitaxial films, which were grown on Al2O3 (0001) by oxygen-plasma assisted molecular beam epitaxy. Raman measurements revealed two local vibration modes (LVMs) at 723 and 699 cm−1 due to the substitution of Co2+ in wurtzite ZnO lattice. The LVM at 723 cm−1 is found to be an elemental sensitive vibration mode for Co substitution. The LVM at 699 cm−1 can be attributed to enrichment of Co2+ bound with oxygen vacancy, the cobalt–oxygen vacancy–cobalt complexes, in Zn1−xCoxO films associated with ferromagnetism. The intensity of LVM at 699 cm−1, as well as saturated magnetization, enhanced after the vacuum annealing and depressed after oxygen annealing.
Journal: Current Applied Physics - Volume 14, Issue 5, May 2014, Pages 744–748