Laser induced ultrafast demagnetization in diluted magnetic semiconductor nanostructures
INRIA Nancy Grand-Est and Institut de Recherche en Mathématiques Avancées, 7 rue René Descartes, 67084 Strasbourg, France
2 IPCMS, 23, rue du Loess, 67037 Strasbourg, France
Corresponding author: a firstname.lastname@example.org
Published online: 24 January 2009
We present a dynamical model that reproduces the observed time evolution of the magnetization in diluted magnetic semiconductor films after weak laser excitation. Based on a many-particle expansion of the exact p–d exchange interaction, our approach goes beyond the usual mean-field approximation. Numerical results demonstrate that the hole spin relaxation plays a crucial role for explaining the ultrafast demagnetization processes observed experimentally. The influence of the laser power on the magnetization dynamics is also investigated.
PACS: 78.20.Ls – Magnetooptical effects / 78.30.Fs – III-V and II-VI semiconductors
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009