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The European Physical Journal D

, Volume 43, Issue 1–3, pp 251–253 | Cite as

Ultrafast spin dynamics of an individual CoPt3 ferromagnetic dot

  • A. Laraoui
  • V. HaltéEmail author
  • M. Vomir
  • J. Vénuat
  • M. Albrecht
  • E. Beaurepaire
  • J.-Y. Bigot
Spectroscopy and Dynamics with Short Laser Pulses

Abstract.

We have studied the ultrafast magneto-optical response of CoPt3 ferromagnetic nanodots with diameters ranging from 0.2 to 1 μm. Our experiments combine an accurate temporal resolution using femtosecond laser pulses and a high spatial resolution (\(\leqslant\)300 nm) obtained with a reflective confocal Kerr microscope. Our experimental approach allows exploring the dynamics of the magnetization of magnetic nanostructures over a broad temporal scale ranging from 100 fs to 1 ns. We report the corresponding relaxation behavior of the electrons and the spins initially excited with a large excess energy above the Fermi level.

PACS.

78.20.Ls Magnetooptical effects 78.47+p Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter 42.65.Sf Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics  

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • A. Laraoui
    • 1
  • V. Halté
    • 1
    Email author
  • M. Vomir
    • 1
  • J. Vénuat
    • 1
  • M. Albrecht
    • 1
  • E. Beaurepaire
    • 1
  • J.-Y. Bigot
    • 1
  1. 1.Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 ULP-CNRSStrasbourg Cedex 2France

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