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

A. Espinosa*, A. Muñoz-Noval, M. García-Hernández, A. Serrano, J. Jiménez De La Morena, A. Figuerola, A. Quarta, T. Pellegrino, C. Wilhelm, M. A. García

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


In 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.

Original languageEnglish (US)
Article number1514
JournalJournal of Nanoparticle Research
Issue number4
StatePublished - Apr 2013
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgments This work was supported by the European project MAGNIFYCO (Contract NMP4-SL-2009-228622); Spanish Ministerio de Economía y Competitividad grants CSD2009-00013, MAT2011-27470-C02-02, and FIS-2008-06249; and Madrid Region Council project NANOBIO MAGNET (S2009/MAT-1726). A. F. acknowledges financial support from the Spanish MICINN through CTQ2009-06959


  • Antiphase boundaries
  • Magnetic nanoparticles
  • Superparamagnetism
  • X-ray absorption spectroscopy

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • General Materials Science
  • Condensed Matter Physics


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