1 March 2010 Spin dynamics and manipulation in GaMnAs alloys
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We review recent experiments on spin excitation and manipulation in the ferromagnetic semiconductor GaMnAs. Spin dynamics in GaMnAs have been studied by two complementary approaches - by frequency-domain techniques, such as Brillouin light scattering (BLS) and ferromagnetic resonance (FMR); and by optical real-time techniques, such as ultrafast pump-probe magneto-optical spectroscopy. Using BLS and FMR, magnon frequencies (or resonance fields), were investigated as a function of Mn concentration, temperature and direction of magnetization, leading to information on magnetic anisotropy. Time-resolved magneto-optical Kerr effect, on the other hand, was used to study photo-induced femtosecond magnetization rotation, ultrafast optical demagnetization, and collective magnetization precession. Optically-induced transient changes in magnetization of GaMnAs produced by femtosecond laser pulses are analyzed and discussed in terms of the Landau-Lifshitz-Gilbert model. Finally, for completeness, we also discuss carrier-mediated nonthermal and thermal (lattice-heating) contributions to spin dynamics.
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X. Liu, Y. Y. Zhou, E. Harley, L. E. McNeil, J. Wang, J. Qi, Y. Xu, A. Steigerwald, N. Tolk, J. P. Zahn, A. Gamouras, S. March, K. C. Hall, J. K. Furdyna, "Spin dynamics and manipulation in GaMnAs alloys", Proc. SPIE 7600, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV, 76000T (1 March 2010); doi: 10.1117/12.840415; https://doi.org/10.1117/12.840415

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