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

Autor:	Lenk, Benjamin, Eilers, Gerrit, Hamrle, Jaroslav, Münzenberg, Markus
Rok vydání:	2008
Předmět:	Condensed Matter - Other Condensed Matter
Zdroj:	Physical Review B 82 (2010), 134443
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.82.134443
Popis:	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. Comment: 7 pages, 6 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0803.3686 Zobrazit plný text záznamu View this record from Arxiv