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The spin-wave relaxation mechanisms after intense laser excitation inferromagnetic nickel films are investigated with all-optical pump-probeexperiments. Uniform precession (Kittel mode), Damon-Eshbach surface modes andperpendicular standing spin waves can be identified by their dispersion f(H).However, different to other ferromagnets f(H) deviates from the expectedbehavior. Namely, a mode discontinuity is observed, that can be attributed to anon-linear process. Above a critical field the power spectrum reveals aredistribution of the energy within the spin-wave spectrum populated.

Unusual spin-wave population in nickel after femtosecond laser pulse excitation