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Coherent oscillations associated with spin precessions were observed inultrafast optical experiments on ferromagnetic (Ga,Mn)As films. Using acomplete theoretical description of the processes by which light couples to themagnetization, values for the exchange and anisotropy constants were obtainedfrom the field-dependence of the magnon frequencies and theoscillation-amplitude ratios. Results reveal a relatively large negativecontribution to the energy due to surface anisotropy leading to excitationsthat are a mixture of bulk waves and surface modes.Comment: 17 pages, 4 figure

Light-induced magnetic precession in (Ga,Mn)As slabs: Hybrid standing-wave Damon-Eshbach modes