Title :
Probing of Spin Wave Resonances in (Ga,Mn)As by Time-Resolved Magneto-Optical Technique
Author :
Schmoranzerova, Eva ; Tesarova, Nad´a ; Janda, Tomas ; Butkovicova, Dagmara ; Trojanek, Frantisek ; Maly, Petr ; Novak, Vilem ; Olejnik, Kamil ; Jungwirth, Tomas ; Nemec, Petr
Author_Institution :
Fac. of Math. & Phys., Charles Univ. in Prague, Prague, Czech Republic
Abstract :
We report on all-optical detection of magnetization dynamics in the ferromagnetic semiconductor (Ga,Mn)As in the presence of spin-wave resonances (SWRs) using a time-resolved magneto-optical (TRMO) technique. In our previous experiments, we demonstrated the possibility to reconstruct the magnetization dynamics directly from the TRMO signals. In this paper, we present a detailed time-domain analysis of the TRMO traces obtained using this method to determine the exact influence of the higher SWR modes on the laser-induced magnetization dynamics. We focus on the effect of the SWR on the evolution of the spatially averaged magnetization.
Keywords :
III-V semiconductors; ferromagnetic resonance; gallium compounds; magnetic semiconductors; magnetisation; magneto-optical effects; manganese compounds; spin dynamics; time-domain analysis; SWR modes; TRMO traces; ferromagnetic semiconductor; laser-induced magnetization dynamics; optical detection; spin wave resonances; time-domain analysis; time-resolved magneto-optical technique; Magnetic recording; Magnetic resonance; Magnetization; Measurement by laser beam; Probes; Saturation magnetization; Ultrafast optics; Magnetization dynamics; magnetic semiconductors; magneto-optic effects; ultrafast laser spectroscopy;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2320778
