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Hyperfine Interactions

, Volume 170, Issue 1–3, pp 33–46 | Cite as

Vibrational dynamics of Fe in amorphous Fe–Sc and Fe–Al alloy thin films

  • B. Sahoo
  • W. Keune
  • E. Schuster
  • W. Sturhahn
  • J. Zhao
  • T. S. Toellner
  • E. E. Alp
Article
  • 57 Downloads

Abstract

The atomic vibrational dynamics of 57Fe in 800-Å thick amorphous (a-) 57Fe0.25Sc0.75, a-57Fe0.67Sc0.33 and a-57Fe0.14Al0.86 alloy thin films has been investigated at room temperature by nuclear resonant inelastic X-ray scattering (NRIXS) of synchrotron radiation. The amorphous phase has been successfully stabilized by codeposition of Fe and Sc or Al in ultrahigh vacuum onto substrates held at –140 °C during deposition. The amorphous structure of the samples was confirmed by X-ray diffraction and conversion electron Mössbauer spectroscopy. The 57Fe-projected partial vibrational density of states, g(E), has been obtained from the measured NRIXS vibrational excitation probability, together with thermodynamic quantities such as the probability of recoilless absorption (f-factor), the average kinetic energy per Fe atom, the average force constant, and the vibrational entropy per Fe atom. A plot of the reduced density of states, g(E)/E2, versus excitation energy E proves the existence of non-Debye-like vibrational modes (boson peak) with a peak energy, E bp , in the range of 3–7 meV. Both, the boson peak height H bp and E bp were found to depend on the composition. Above the boson peak, g(E)/E2 exhibits an exponential decrease. Our results demonstrates that the features of the boson peak depend on the amount and type of element M (M = Al, Si, Mg, Sc).

Key words

amorphous alloys Fe–Sc Fe–Al thin films conversion electron Mössbauer spectroscopy (CEMS) nuclear resonant inelastic X-ray scattering atomic vibrational density of states boson peak 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • B. Sahoo
    • 1
  • W. Keune
    • 1
  • E. Schuster
    • 1
  • W. Sturhahn
    • 2
  • J. Zhao
    • 2
  • T. S. Toellner
    • 2
  • E. E. Alp
    • 2
  1. 1.Department of PhysicsUniversity of Duisburg-EssenDuisburgGermany
  2. 2.Advanced Photon SourceArgonne National LaboratoryArgonneUSA

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