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Hyperfine Interactions

, Volume 224, Issue 1–3, pp 299–305 | Cite as

Iron nano-clusters in ytterbium films: a 57Fe Mössbauer spectroscopic study

  • C. Rojas-Ayala
  • W. T. Herrera
  • I. S. Dinóla
  • M. Kraken
  • E. C. Passamani
  • E. Baggio-Saitovitch
  • F. J. Litterst
Article

Abstract

We have performed a Mössbauer study on iron clusters that are formed in ytterbium films prepared by vapor co-deposition onto kapton substrates kept at room temperature. The film thicknesses were chosen in a range between 2.5 and 2.8 \(\upmu\)m. XRD of the films reveals a mixture of fcc- and hcp-like ytterbium. Iron concentrations were between 0.3 and 5 at %. All samples reveal hyperfine spectra attributed to only two types of iron clusters with well defined hyperfine parameters. The clusters are supposed to be formed at boundaries of hcp- and fcc-like grains. In addition there is found a small contribution from monomeric iron. Spectra taken at 4.2 K reveal a complex distribution of magnetic hyperfine fields. The dynamic origin of the spectral shape is supported by susceptibility data revealing spin-freezing at temperatures below ca. 10 K. This proves that the iron clusters have sizes on the order of nm.

Keywords

Mössbauer spectroscopy Iron nano-clusters Ytterbium films Vapor deposition Spin-freezing 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • C. Rojas-Ayala
    • 1
    • 2
  • W. T. Herrera
    • 1
  • I. S. Dinóla
    • 1
  • M. Kraken
    • 3
  • E. C. Passamani
    • 4
  • E. Baggio-Saitovitch
    • 1
  • F. J. Litterst
    • 1
    • 3
  1. 1.Centro Brasileiro de Pesquisas FísicasRio de JaneiroBrazil
  2. 2.Facultad de Ciencias FísicasUniversidad Nacional Mayor de San MarcosLimaPeru
  3. 3.Institut für Physik der Kondensierten MaterieTechnische Universität BraunschweigBraunschweigGermany
  4. 4.Departamento de FísicaUniversidade Federal do Espírito SantoVitóriaBrazil

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