ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
In this work, the structural and magnetic properties of polycrystalline Zn1-xCoxO (x = 0,0.02, 0.05, 0.0625, 0.10 and 0.15) oxides were studied in detail. Rietveld refinement of x-raydiffraction spectra indicates that a single-phase wurtzite structure was formed in Zn1-xCoxO samplesfor x up to 0.10. The magnetization for x = 0.02 can be fitted to a model with a paramagnetic Curieterm and a diamagnetic constant which could arise from spins of isolated free Co ions and adiamagnetic background, respectively. For x 〉 0.02, however, an additional antiferromagneticCurie-Weiss term needs to employ for fitting. This is due to an additional contribution fromclustered Co ions that are in nearest neighbor positions through oxygen ions. Results show that thesubstitution of Co at the Zn site does not occur in a completely random manner but Co ions appearto have a tendency for clustering. In addition, the homogenous ZnO:Co thin film prepared byPulsed Laser Deposition on SiO2/Si substrate shows ferromagnetic behavior at room temperature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.2520.pdf
