Coherent magnetization precession in ferromagnetic (Ga,Mn)As induced by picosecond acoustic pulses.
We show that the magnetization of a thin ferromagnetic (Ga,Mn)As layer can be modulated by picosecond acoustic pulses. In this approach a picosecond strain pulse injected into the structure induces a tilt of the magnetization vector M, followed by the precession of M around its equilibrium orientation. This effect can be understood in terms of changes in magnetocrystalline anisotropy induced by the pulse. A model where only one anisotropy constant is affected by the strain pulse provides a good description of the observed time-dependent response.
Scherbakov
A V
AV
Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 194021 St. Petersburg, Russia.
Salasyuk
A S
AS
Akimov
A V
AV
Liu
X
X
Bombeck
M
M
Brüggemann
C
C
Yakovlev
D R
DR
Sapega
V F
VF
Furdyna
J K
JK
Bayer
M
M