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

Abstract

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.

7 pages, 6 figures

References in corpus (4)

• Realization of XNOR and NAND spin-wave logic gates
• Magnonic spin-wave modes in CoFeB antidot lattices
• Connecting the timescales in picosecond remagnetization experiments
• Analytical expression of the magneto-optical Kerr effect and Brillouin light scattering intensity arising from dynamic magnetization

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