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

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

2008-03-26

arxiv.org/abs/0803.3686v2

Physical Review B 82 (2010), 134443

Physics

Condensed Matter

Other Condensed Matter

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.82.134443

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

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