Coherent magnetization precession in ferromagnetic (Ga,Mn)As induced by picosecond acoustic pulses

Details Coherent magnetization precession in ferromagnetic (Ga,Mn)As induced by picosecond acoustic pulses Coherent magnetization precession in ferromagnetic (Ga,Mn)As induced by picosecond acoustic pulses

2010-06-21

arxiv.org/abs/1006.4133v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 3 figures

Scientific paper

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 magneto-crystalline 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.

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