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dc.contributor.authorMartínez Benjamin, Joan Josepcat
dc.contributor.authorSandiumenge Ortiz, Felipcat
dc.contributor.authorBalcells i Argemí, Lluíscat
dc.contributor.authorArbiol i Cobos, Jordicat
dc.description.abstractIn this work we carefully analyze the role of the microstructure on the magnetic properties of Co-doped ZnO nanoparticles prepared by the vaporization-condensation method in a solar reactor. We show that a close correlation exists between microstructural features and the appearance of ferromagnetism. Both shape and size of the particles, as well as the microstructure, can be controlled by changing the pressure inside the evaporation chamber, as evidenced by transmission electron microscopy micrographs and high resolution electron microscopy HREM. X-ray diffraction patterns and HREM make evident the absence of any significant Co segregation or any other phase different from würtzite type ZnO. On the other hand, electron energy loss spectroscopy analyses performed on several particles of würtzite type ZnO yielded an average Co concentration in good agreement with the nominal composition. Samples prepared in low pressure 10 Torr exhibit a very homogeneous microstructure and are ferromagnetic at low temperature but they have a very small saturation moment, well below that expected for a Co2+ ion. Conversely, samples prepared at higher pressure conditions 70–100 Torr show a defective microstructure and are paramagnetic and increasing the Co content does not induce ferromagnetism.-
dc.publisherThe American Physical Societycat
dc.relation.isformatofReproducció digital del document publicat en format paper, proporcionada per PROLA i
dc.relation.ispartofPhysical Review B, 2005, vol. 72, num. 16, p. 165202-1-165202-8cat
dc.rights(c) The American Physical Society, 2005cat
dc.sourceArticles publicats en revistes (Enginyeria Electrònica i Biomèdica)-
dc.subject.classificationPropietats magnètiquescat
dc.subject.otherMagnetic properties and materialseng
dc.titleStructure and magnetic properties of Co-doped ZnO nanoparticleseng
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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