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Magnetic properties of iron oxide nanoparticles prepared by seeded-growth route

AuthorsEspinosa, A. ; Muñoz-Noval, A. ; García-Hernández, M. ; Serrano Rubio, Aída ; Jiménez de la Morena, J.; García García-Tuñón, Miguel Ángel
KeywordsMagnetic nanoparticles
X-ray absorption spectroscopy
Antiphase boundaries
Issue Date2013
CitationJournal of Nanoparticle Research 15: 1514 (2013)
AbstractIn this work we investigate the magnetic properties of iron oxide nanoparticles obtained by two-step synthesis (seeded-growth route) with sizes that range from 6 to 18 nm. The initial seeds result monocrystalline and exhibit ferromagnetic behavior with low saturation field. The subsequent growth of a shell enhances the anisotropy inducing magnetic frustration, and, consequently, reducing its magnetization. This increase in anisotropy occurs suddenly at a certain size (~10 nm). Electronic and structural analysis with X-ray absorption spectroscopy indicates a step reduction in the oxidation state as the particle reaches 10 nm size while keeping its overall structure in spite of the magnetic polydispersity. The formation of antiphase magnetic boundaries due to island percolation in the growing shells is hypothesized to be the mechanism responsible of the magnetic behavior, as a direct consequence of the two-step synthesis route of the nanoparticles.
Identifiersdoi: 10.1007/s11051-013-1514-8
e-issn: 1572-896X
issn: 1388-0764
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