Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 555, Issue -, Pages 315-319Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.11.105
Keywords
Solid state reactions; Oxide materials; Magnetically ordered materials; X-ray diffraction; Scanning tunnelling microscopy; STM, Synchrotron radiation; Magnetic measurements
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Funding
- FAPEMIG
- CNPq
- FAPESP
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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. (C) 2012 Elsevier B.V. All rights reserved.
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