Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 8: Spindynamik I
MA 8.7: Vortrag
Freitag, 4. März 2005, 16:45–17:00, TU H1028
Parametric Generation of Forward and Phase-Conjugated Spin-Wave Bullets in Magnetic Films — •Alexander A. Serga1, Burkard Hillebrands1, Sergey O. Demokritov2, Andrey N. Slavin3, P. Wierzbicki3, Vitaliy Vasyuchka4, Oleksandr Dzyapko4, and Andriy Chumak4 — 1Fachbereich Physik, Technische Universität Kaiserslautern, Kaiserslautern, Germany — 2Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Münster, Germany — 3Department of Physics, Oakland University, Rochester, Michigan 48309, USA — 4Department of Radiophysics, Taras Shevchenko National University of Kiev, Kiev, Ukraine
The new physical effect of parametrically stimulated generation of two-dimensional nonlinear objects, so-called spin-wave bullets, has been observed in a magnetic film. It has been shown experimentally and by numerical simulation that interaction of a linear two-dimensional spin wave packet with the microwave magnetic field in a pulsed parametric pumping process leads to the formation of strongly self-focused spin wave bullets propagating both in forward and reversed directions. The focusing of the reversed (phase-conjugated) bullet is strongly pronounced due to the combined effects of the nonlinear four-wave self-focusing and linear focusing caused by the two-dimensional wave front reversal process.