Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2006-06-05
Physics
Condensed Matter
Other Condensed Matter
15 pages
Scientific paper
Spin-wave instability is studied analytically in the case of parallel pumping for thin films under external field perpendicular to the film plane. It is examined whether the instability threshold derived from only the Landau-Lifshitz (LL) equation can explain experimental instability threshold without using the microscopically-derived spin-wave line width, which is conventionally used. It is revealed that the butterfly curve cannot be explained from only the LL equation at least in an analytical way. By contrast, for the case of perpendicular pumping, the Suhl instability was well explained from the LL equation. The difference between the two cases comes from the nonlinear terms describing the relaxation of spin waves. It is suggested how the nonlinear terms in the LL equation should be related to the spin-wave line width for parallel pumping.
Kudo Kazue
Nakamura Katsuhiro
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