Séminaire de groupe
|Magnetization Dynamics in Nanostructures|
|jeudi 04 avril 2013 , 14h00|
|Salle de séminaire du groupe de Physique Statistique|
Ultrafast light-induced magnetization dynamics in ferromagnetic film and in Diluted Magnetic Semiconductors is today an active area of research. Ferromagnetic semiconductors are obtained by the substitution a small molar fraction of cations of a III-V semiconductor with high-spin ions. The magnetism can be efficiently modified by controlling the doping density or by excitation of electron–hole pairs with a laser pulse. We present a dynamical model that explains the time evolution of the magnetization in 2D diluted magnetic semiconductors. Based on the pseudo-fermion formalism and many-particle expansion the exchange interaction, our approach includes RKKY-like interactions and double-exchange mechanisms.