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Hyperfine Interactions

, Volume 148, Issue 1–4, pp 275–284 | Cite as

Magnetism of Nanosized Oxide Systems Investigated by Mössbauer Spectroscopy

  • S. G. Marchetti
  • R. C. Mercader
Article

Abstract

The Mössbauer characterization of nanosized iron oxides is based on the dependence of the magnetic relaxation time on several parameters. Because the contributions of the magnetic anisotropy and of the particle volume cannot be separated, the knowledge of properties other than hyperfine by the use of several techniques is needed to achieve a full understanding of the studied system. In this work, after a brief review of the difference between bulk and nanostuctured magnetism, we show how Mössbauer spectroscopy, complemented by other techniques, applied to nanosized systems of maghemite and hematite, yields a good characterization of the solids and of the interparticle interactions. In the case of hematite we also show that more work is needed to identify in depth the parameters that determine the Morin transition.

magnetism of nanosized iron oxides Mössbauer spectroscopy superparamagnetism nanoparticle size determination 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • S. G. Marchetti
    • 1
  • R. C. Mercader
    • 2
  1. 1.Departamento de Química, CINDECA, Facultad de Ciencias ExactasUniversidad Nacional de La PlataLa PlataArgentina
  2. 2.Departamento de Física, IFLP, Facultad de Ciencias ExactasUniversidad Nacional de La PlataLa PlataArgentina

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