Functional properties of nickel cobalt oxide thin films
Functional properties of nickel cobalt oxide thin films
Iacomi, F.; Calin, G.; Scarlat, C.; Irimia, M.; Doroftei, C.; Dobromir, M.; Rusu, G. G.; Iftimie, N.; Sandu, A. V.
Cobalt–nickel oxide films of known stoichiometry (x = Ni / (Co + Ni) = 0.30–0.63) were deposited on glass slides by using a spin-coating method and were UV irradiated for 2 h. The structure and morphology of thin films evidenced nanocrystalline spinel structures. Thin films with x = 0.63–0.5 have a mixed phase structure and good sensing properties for ethanol. Thin films with x = 0.30–0.40 have a single spinel phase, are ferrimagnetic and highly conductive at 300 K and have magnetoresistance ratios of 5–8%. Four-probe measurements indicate an insulator–metal transition at temperatures slightly below ferromagnetic Curie temperature. Metallic Ni and Co particles improve thin film functional properties.
Keywords: Spinel structure; Electrical properties; Magnetic properties; Gas sensor
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
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Thin Solid Films 520(2011)1, 651-655
DOI: 10.1016/j.tsf.2011.08.067
Cited 27 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-17409