Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 8: Spindynamik I

MA 8.8: Vortrag

Freitag, 4. März 2005, 17:00–17:15, TU H1028

Quasi-2D nonlinear spin wave waveforms in in-plane confined ferromagnetic films — •Alexander A. Serga¹, Mikhail Kostylev¹, Burkard Hillebrands¹, Sergey O. Demokritov², and Andrey N. Slavin³ — 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

The formation of quasi-2D spin-wave waveforms in longitudinally magnetized stripes of ferrimagnetic film was observed by using time- and space-resolved Brillouin light scattering technique. In the linear regime it was found that the confinement decreases the amplitude of dynamic magnetization near the lateral stripe edges. Thus, the so-called effective dipolar pinning of dynamic magnetization takes place at the edges. In the nonlinear regime a pronounced formation of focus and a collapse of the waveform were observed. The experiments and a numerical simulation of the pulse evolution show that the shape of the formed waveforms and their behavior are strongly influenced by the confinement.