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Title: Structure and magnetic properties of Co-doped ZnO nanoparticles
Author: Martínez Benjamin, Joan Josep
Sandiumenge Ortiz, Felip
Balcells i Argemí, Lluís
Arbiol i Cobos, Jordi
Sibieude, F.
Monty, C.
Keywords: Nanopartícules
Propietats magnètiques
Magnetic properties and materials
Issue Date: 2005
Publisher: The American Physical Society
Abstract: In 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.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2005, vol. 72, num. 16, p. 165202-1-165202-8
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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