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Extrinsic origin of ferromagnetism in doped ZnO

AutorBlasco, Javier; Bartolomé, Fernando; García, L. M.; García, Joaquín
Fecha de publicación21-mar-2006
EditorRoyal Society of Chemistry (Great Britain)
CitaciónJournal of Materials Chemistry 16: 2282–2288 (2006)
ResumenDifferent synthetic routes have been tested to prepare bulk doped ZnO. The doping elements were Mn, Fe and Co. We were able to prepare single-phase compounds at high temperature by using ceramic procedures and at very low temperature using a sol–gel method. No ferromagnetism has been observed for these samples. In contrast, spontaneous magnetization is observed in samples obtained from non-optimal conditions and exhibiting secondary phases. Magnetic impurities have been easily identified for Fe- and Co-doped samples. However, the nature of the room temperature magnetic impurity for the Mn-based compound is not so clear and different possibilities are discussed. We have also checked the effect of the grain size on the magnetic properties by synthesizing nano-materials using a sol–gel route. The single-phase nano-compounds are also not ferromagnets showing similar properties to the well-sintered polycrystalline materials.
Descripción7 pages, 9 figures, 1 table.
Versión del editorhttp://dx.doi.org/10.1039/b518418e
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