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|Type:||Artigo de evento|
|Title:||Structural And Optical Properties Of Zn 1-xco Xo And Znco 2o 4 Thin Films|
|Abstract:||Thin films of Co substituted ZnO and ZnCo 2O 4 were deposited on c-axis (0001) oriented Al 2O 3 substrates using pulsed laser deposition. The XRD results showed all the films were highly (002) oriented with a less intense peak of (311) for ZnCo 2O 4 thin film. Micro-Raman spectra of ceramic targets showed the modes related to wurtzite ZnO and spinel ZnCo 2O 4 structures. In thin films of Zn 1-xCo xO no modes corresponding to ZnCo 2O 4 were detected. The intensity of E 1(LO) and multiphonon peak at 584 and 540 cm -1 respectively, increased with increase in Co substitution. The optical absorption of the films showed that the band gap decreased with increase of Co concentrations at room temperature along with the sub-bandgap absorptions due to d-d transitions of Co 2+. Similar sub-bandgap d-d transition was also observed in the absorption spectra ZnCo 2O 4 thin films. The highest saturated magnetization (0.2μB/Co) was obtained for 5%Co substituted ZnO. © 2006 Materials Research Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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