Eur. Phys. J. D 52, 155-158 (2009)
https://doi.org/10.1140/epjd/e2008-00281-1

Laser induced ultrafast demagnetization in diluted magnetic semiconductor nanostructures

¹ 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 morandi@dipmat.univpm.it

Received: 19 September 2008
Published online: 24 January 2009

Abstract

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.