Synthesis, structural and magnetic characterization of lead-metaniobate/cobalt-ferrite nanocomposite films deposited by pulsed laser ablation

Detailed structural, microstructural and magnetic measurements were performed on (PbNb2O6)(1-x) -(CoFe2O4) (x) nanocomposite thin films deposited by laser ablation on Si(001)\Pt substrates, with different cobalt ferrite concentrations. The tuning of the lead concentration, due to the lead volatility...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2015-01, Vol.118 (1), p.275-281
Main Authors: Sá, Pedro, Barbosa, J., Gomes, Isabel T., Mendes, Jorge A., Ventura, João, Araújo, João P., Almeida, B. G.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Ciências Físicas
Ciências Naturais
Cobalt ferrites
Compressive properties
Condensed Matter Physics
Deposition
Laser ablation
Machines
Magnetic anisotropy
Magnetization
Manufacturing
Nanostructure
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Science & Technology
Strain
Surfaces and Interfaces
Thin Films
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Summary:Detailed structural, microstructural and magnetic measurements were performed on (PbNb2O6)(1-x) -(CoFe2O4) (x) nanocomposite thin films deposited by laser ablation on Si(001)\Pt substrates, with different cobalt ferrite concentrations. The tuning of the lead concentration, due to the lead volatility, was found to be particularly important in order to obtain the orthorhombic (ferroelectric) lead niobate phase. The lattice parameter of CoFe2O4 was below the bulk value, indicating the presence of compressive strains on this phase. A magnetic anisotropy was observed, which favored the orientation of the magnetization in the direction perpendicular to the plane of the films, for cobalt ferrite concentrations 40-50 %. The shape, stress and magnetocrystalline anisotropy fields on the composites were calculated and compared. It was found that the perpendicular magnetic anisotropy was induced by the presence of strain on the ferrite phase in the films. - This work has been supported by Fundacao para a Ciencia e Tecnologia (FCT) and FEDER, through the projects POCI/CTM/60181/2004 and PTDC/CTM/099415/2008. J. Barbosa and I. T. Gomes gratefully acknowledge Ph.D. grants from Fundacao para a Ciencia e Tecnologia (SFRH/BD/41913/2007 and SFRH/BD/36348/2007, respectively).
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-014-8676-9