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Systèmes oxyde pour l'électronique de spin : étude de l'oxyde magnétique dilué CeO2 dopé au cobalt et d'assemblées de nano-particules de cobalt dans TiO2−delta

Abstract : This work deals with the diluted magnetic oxide Co-doped CeO2 and with cobalt nano-particles embedded in a TiO2-delta matrix. These particles are not oxidized and they show very interesting magneto-transport properties. Thin films of (Ce,Co)O2 are textured on Si and epitaxially grown on SrTiO3. For both substrates, films grown under vacuum are ferromagnetic. There is a magnetic anisotropy with an easy axis perpendicular to the film plane. Films grown or annealed under oxygen are weakly ferromagnetic but after an annealing under vacuum, the magnetization of these films increases markedly. Thus, magnetic properties of (Ce,Co2) can be manipulated reversibly by appropriate annealing treatments. These magnetic properties are not due to a ferromagnetic secondary phase such as metallic cobalt. Spectroscopic measurements show that the ferromagnetic state is correlated with a high concentration of oxygen vacancies.
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https://tel.archives-ouvertes.fr/tel-00248420
Contributor : Boris Vodungbo <>
Submitted on : Friday, February 8, 2008 - 11:37:33 AM
Last modification on : Friday, May 29, 2020 - 3:59:38 PM
Long-term archiving on: : Monday, May 17, 2010 - 4:18:42 PM

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  • HAL Id : tel-00248420, version 1

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Boris Vodungbo. Systèmes oxyde pour l'électronique de spin : étude de l'oxyde magnétique dilué CeO2 dopé au cobalt et d'assemblées de nano-particules de cobalt dans TiO2−delta. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2007. Français. ⟨tel-00248420⟩

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