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The European Physical Journal B

, Volume 74, Issue 4, pp 467–474 | Cite as

Transition from antiferromagnetic interlayer ordering to superparamagnetic state in Fe/Cr nanostructures by varying Fe thickness

  • V. V. Ustinov
  • M. A. Milyaev
  • L. N. Romashev
  • A. V. Korolev
  • V. A. Tsurin
  • N. S. Yartseva
  • S. V. Yartsev
  • J. C. ParlebasEmail author
Solid State and Materials

Abstract

Transition from antiferromagnetic exchange coupling of the Fe layers to superparamagnetic state of the Fe/Cr nanostructures is studied experimentally and theoretically. The experimental study are performed by means of magnetoresistance and magnetization measurements as well as Mössbauer spectroscopy for the nanostructures with Fe layers thicknesses from 1.4 Å up to 16 Å alternating by 10 Å of Cr layers. It is shown that Fe layers in the nanostructures with thicknesses less than 2 Å are not continuous but consist of separate ferromagnetic clusters. Such cluster-layered nanostructures exhibit Langevin paramagnetism of the superparamagnetic clusters and the Kondo-like behavior of the resistance. For the considered nanostructures, a modeling of Fe and Cr atoms random deposition for the interface layers and self-consistent calculations of the magnetic moments distribution in Periodic Anderson model are carried out. It is shown that, for nanostructures with extremely thin Fe layers, the Fe clusters with lateral size in the range of 11 to 20 Å are self-organized. Calculations of magnetic moments distribution result in histograms which coincide with the hyperfine field distributions obtained by Mössbauer spectroscopy.

Keywords

Average Magnetic Moment Statistical Histogram Periodic Anderson Model Magnetic Moment Distribution Cluster Magnetic Moment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • V. V. Ustinov
    • 1
  • M. A. Milyaev
    • 1
  • L. N. Romashev
    • 1
  • A. V. Korolev
    • 1
  • V. A. Tsurin
    • 1
  • N. S. Yartseva
    • 1
  • S. V. Yartsev
    • 2
  • J. C. Parlebas
    • 3
    Email author
  1. 1.Institute of Metal Physics UD of RASEkaterinburgRussia
  2. 2.ZAO NPO “Spektr”, 14 Zapadnaya promzona, BerezovskiySverdlovskaya oblast’Russia
  3. 3.Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS-UDSStrasbourg Cedex 2France

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