Ultrafast spin dynamics of an individual CoPt3 ferromagnetic dot
Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 ULP-CNRS, B.P. 43, 67034 Strasbourg Cedex 2, France
Corresponding author: a email@example.com
Revised: 15 September 2006
Published online: 24 May 2007
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 (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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007