Effect of Reducing Atmosphere on the Magnetism of Zn1-xCoxO Nanoparticles

Simple item page
dc.creatorNaeem, M.
dc.creatorHasanain, S. K.
dc.creatorKobayashi, M.
dc.creatorIshida, Y.
dc.creatorFujimori, A.
dc.creatorBuzby, Scott
dc.creatorShah, S. Ismat
dc.date2005-12-22
dc.date.accessioned2026-07-07T06:53:39Z
dc.date.available2026-07-07T06:53:39Z
dc.descriptionWe report the crystal structure and magnetic properties of Zn1-xCoxO nanoparticles synthesized by heating metal acetates in organic solvent. The nanoparticles were crystallized in wurtzite ZnO structure after annealing in air and in a forming gas (Ar95%+H5%). The X-ray diffraction and X-ray photoemission spectroscopy (XPS) data for different Co content show clear evidence for the Co+2 ions in tetrahedral symmetry, indicating the substitution of Co+2 in ZnO lattice. However samples with x=0.08 and higher cobalt content also indicate the presence of Co metal clusters. Only those samples annealed in the reducing atmosphere of the forming gas, and that showed the presence of oxygen vacancies, exhibited ferromagnetism at room temperature. The air annealed samples remained non-magnetic down to 77K. The essential ingredient in achieving room temperature ferromagnetism in these Zn1-xCoxO nanoparticles was found to be the presence of additional carriers generated by the presence of the oxygen vacancies.
dc.description11 pages, 6 figures, submitted to Nanotechnology IOP
dc.identifierhttps://arxiv.org/abs/cond-mat/0512597
dc.identifierhttp://arxiv.org/abs/cond-mat/0512597
dc.identifierNanotechnology 17 (2006) 2675--2680
dc.identifierdoi:10.1088/0957-4484/17/10/039
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/105660
dc.subjectMaterials Science
dc.subjectOther Condensed Matter
dc.titleEffect of Reducing Atmosphere on the Magnetism of Zn1-xCoxO Nanoparticles
dc.typetext

Files

Collections

arXiv