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Title

Room-temperature ferromagnetism in the mixtures of the TiO2 and Co3O4 powders

AuthorsSerrano Rubio, Aída CSIC ORCID ; Fernández Pinel, E. CSIC; Quesada, Adrián CSIC ORCID ; Lorite, Israel CSIC; Plaza, M.; Pérez, Lucas; Jiménez-Villacorta, Félix CSIC ORCID ; Venta, José de la CSIC ORCID; Martín-González, Marisol; Costa Krämer, José Luis CSIC ORCID ; Fernández Lozano, José Francisco CSIC ORCID ; Llopis, J.; García García-Tuñón, Miguel Ángel
KeywordsCobalt compounds
Ferromagnetic materials
Magnetic particles
Magnetisation, reduction (chemical)
Surface chemistry
Surface magnetism
Titanium compounds
X-ray absorption spectra
Issue Date3-Apr-2009
PublisherAmerican Physical Society
CitationPhysical Review B 79 (2009)
AbstractWe report here the observation of ferromagnetism (FM) at 300 K in mixtures of TiO2 and Co3O4 powders despite the antiferromagnetic and diamagnetic characters of both oxides, respectively. The ferromagnetic behavior is found in the early stages of reaction and only for TiO2 in anatase structure; no FM is found for identical samples prepared with rutile-TiO2. Optical spectroscopy and x-ray absorption spectra confirm a surface reduction of octahedral Co+3Co+2 in the mixtures which is in the origin of the observed magnetism.
Publisher version (URL)http://link.aps.org
http://dx.doi.org/10.1103/PhysRevB.79.144405
URIhttp://hdl.handle.net/10261/15089
DOI10.1103/PhysRevB.79.144405
ISSN1098-0121
Appears in Collections:(IMN-CNM) Artículos
(ICV) Artículos
(ICMM) Artículos

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