TY - JOUR
T1 - Photoinduced precession of magnetization in ferromagnetic (Ga,Mn)As
AU - Hashimoto, Y.
AU - Kobayashi, S.
AU - Munekata, H.
PY - 2008/2/13
Y1 - 2008/2/13
N2 - Precession of magnetization induced by pulsed optical excitation is observed in a ferromagnetic semiconductor (Ga,Mn)As by time-resolved magneto-optical measurements. It appears as complicated oscillations of a polarization plane of linearly polarized probe pulses, but is reproduced by gyromagnetic theory incorporating an impulsive change in an effective magnetic field due to a change in the magnetic anisotropy. The shape of the impulse suggests a significant nonthermal contribution of photogenerated carriers to the change in anisotropy through spin-orbit interaction.
AB - Precession of magnetization induced by pulsed optical excitation is observed in a ferromagnetic semiconductor (Ga,Mn)As by time-resolved magneto-optical measurements. It appears as complicated oscillations of a polarization plane of linearly polarized probe pulses, but is reproduced by gyromagnetic theory incorporating an impulsive change in an effective magnetic field due to a change in the magnetic anisotropy. The shape of the impulse suggests a significant nonthermal contribution of photogenerated carriers to the change in anisotropy through spin-orbit interaction.
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U2 - 10.1103/PhysRevLett.100.067202
DO - 10.1103/PhysRevLett.100.067202
M3 - Article
AN - SCOPUS:40849113678
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 6
M1 - 067202
ER -