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Evidence of defect-mediated magnetic coupling on hydrogenated Co-doped ZnO

2012; Elsevier BV; Volume: 555; Linguagem: Inglês

10.1016/j.jallcom.2012.11.105

1873-4669

Marcio Peron Franco de Godoy, Alexandre Mesquita, Waldir Avansi, P. P. Neves, V. A. Chitta, Wilmar Barbosa Ferraz, M. A. Boselli, Antônio Claret Soares Sabioni, H. B. de Carvalho,

Gas Sensing Nanomaterials and Sensors

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.