Evidence of defect-mediated magnetic coupling on hydrogenated Co-doped ZnO.
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Date
2013
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Abstract
Hydrogenated bulk Zn1_xCoxO samples were synthesized via standard solid-state reaction route with Co molar concentrations up to 15 at.%. Magnetic characterization demonstrates a room temperature ferromagnetic behavior associated to a paramagnetic Curie–Weiss component. Detailed microstructural analysis was carried out to exclude the presence of extrinsic sources of ferromagnetism. The magnetization increases linearly as a function of Co concentration. Hall measurements reveal an insulating character for the whole set of samples. In this context, the defect mediated magnetic coupling between the Co atoms under the scope of the bound magnetic polarons model is used to interpret the observed room temperature ferromagnetism.
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Keywords
Solid state reactions, Oxide materials, Magnetically ordered materials, X-ray diffraction, Scaning tunnelling microscopy
Citation
GODOY, M. P. F. de et al. Evidence of defect-mediated magnetic coupling on hydrogenated Co-doped ZnO. Journal of Alloys and Compounds, v. 555, p. 315-319, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0925838812020890>. Acesso em: 13 fev. 2015.