Photo-induced precession of magnetization in ferromagnetic (Ga,Mn)As

Y. Hashimoto; H. Munekata

doi:10.1103/PhysRevLett.100.067202

Photo-induced precession of magnetization in ferromagnetic (Ga,Mn)As

Materials Science 2009-11-13 v2

Authors: Y. Hashimoto , H. Munekata

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Abstract

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 polarization plane of linearly-polarized probe pulses, but is reproduced by gyromagnetic theory incorporating an impulsive change in an effective magnetic field due to changes in magnetic anisotropy. It is inferred from the shape of the impulse that the changes in anisotropy result from non-equilibrium carrier population: cooling of hot photo-carriers and subsequent annihilation of photo-carriers.

Keywords

photo-induced precession magnetization (Ga,Mn)As time-resolved magneto-optical measurement magnetic anisotropy non-equilibrium carrier population

Cite

@article{arxiv.0707.4055,
  title  = {Photo-induced precession of magnetization in ferromagnetic (Ga,Mn)As},
  author = {Y. Hashimoto and H. Munekata},
  journal= {arXiv preprint arXiv:0707.4055},
  year   = {2009}
}

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