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We develop a theory of the spin wave dynamics excited by ultrafast focusedlaser pulses in a magnetic film. We take into account both volume and surfacespin wave modes in the presence of applied, dipolar and magnetic anisotropyfields and include the dependence on laser spot exposure size and magneticdamping. We show that the sound waves generated by local heating by anultrafast focused laser pulse can excite a wide spectrum of spin waves (on topof a dominant magnon-phonon contribution). Good agreement with recentexperiments supports the validity of the model.

Theory of spin and lattice wave dynamics excited by focused laser pulses