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

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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.

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Authors and Affiliations

  1. Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180, Rio de Janeiro, RJ, Brazil

    C. Rojas-Ayala, W. T. Herrera, I. S. Dinóla, E. Baggio-Saitovitch & F. J. Litterst

  2. Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, P.O. Box 14-149, Lima 14, Lima, Peru

    C. Rojas-Ayala

  3. Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, 38106, Braunschweig, Germany

    M. Kraken & F. J. Litterst

  4. Departamento de Física, Universidade Federal do Espírito Santo, 29075-910, Vitória, ES, Brazil

    E. C. Passamani

Authors
  1. C. Rojas-Ayala
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  2. W. T. Herrera
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  3. I. S. Dinóla
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  4. M. Kraken
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  5. E. C. Passamani
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  6. E. Baggio-Saitovitch
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  7. F. J. Litterst
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Corresponding author

Correspondence to C. Rojas-Ayala.

Additional information

Thirteenth Latin American Conference on the Applications of the Mössbauer Effect, LACAME 2012, Medellín, Colombia, 11–16 November 2012.

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Rojas-Ayala, C., Herrera, W.T., Dinóla, I.S. et al. Iron nano-clusters in ytterbium films: a 57Fe Mössbauer spectroscopic study. Hyperfine Interact 224, 299–305 (2014). https://doi.org/10.1007/s10751-013-0821-x

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  • DOI: https://doi.org/10.1007/s10751-013-0821-x

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