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Phys Rev Lett. 2006 Feb 10;96(5):057402. Epub 2006 Feb 6.

Ultrafast light-induced magnetization dynamics of ferromagnetic semiconductors.

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Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas and Department of Physics, University of Crete, Heraklion, Greece.


We develop a theory of ultrafast light-induced magnetization dynamics in ferromagnetic semiconductors. We demonstrate magnetization control during femtosecond time scales via the interplay between nonlinear circularly polarized optical excitation, hole-spin damping, polarization dephasing, and Mn-hole-spin interactions. Our results show magnetization relaxation and precession for the duration of the optical pulse governed by the nonlinear optical polarizations and populations.

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