Title :
Laser-Induced Precession of Magnetization in GaMnAs
Author :
Eva Rozkotova;Petr Nemec;Daniel Sprinzl;Petra Horodyska;Frantisek Trojanek;Petr Maly;Vit Novak;Kamil Olejnik;Miroslav Cukr;Tomas Jungwirth
Author_Institution :
Fac. of Math. & Phys., Charles Univ. in Prague, Prague
Abstract :
We report on the photo-induced precession of the ferromagnetically coupled Mn spins in (Ga,Mn)As, which is observed even with no external magnetic field applied. We concentrate on various experimental aspects of the time-resolved magneto-optical Kerr effect (TR-MOKE) technique that can be used to clarify the origin of the detected signals. We show that the measured data typically consist of several different contributions, among which only the oscillatory signal is directly connected with the ferromagnetic order in the sample.
Keywords :
"Magnetization","Magnetic materials","Probes","Optical pumping","Optical pulses","Pump lasers","Magnetooptic effects","Kerr effect","Signal detection","Optical materials"
Journal_Title :
IEEE Transactions on Magnetics
DOI :
10.1109/TMAG.2008.2003061
