Regensburg 2004 – scientific programme
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MA: Magnetismus
MA 9: Hauptvortrag Demokritov
MA 9.1: Invited Talk
Tuesday, March 9, 2004, 09:30–10:00, H10
Experimental observation of symmetry breaking soliton modes in an active ring — •Sergej O. Demokritov1, Alexander A. Serga1, Vladislav E. Demidov1, Burkard Hillebrands1, Michail P. Kostylev2 und Boris A. Kalinikos2 — 1Fachbereich Physik, Technische Universitaett Kaiserslautern, Erwin-Schroedinger-Strasse 56, 67663 Kaiserslautern, Germany — 2St. Petersburg Electrotechnical University, 197376 St. Petersburg, Russia
Solitons are large-amplitude, spatially confined wave packets in nonlinear media. A unique feature is their propagation without a change in shape owing to the stabilizing effect of the nonlinearity. We report on the first experimental study of solitons in an active ring and their novel properties due to phase quantization [1]. As a model system, we constructed an active nonlinear ring based on spin-wave propagation in a magnetic film. To address individually each eigen-mode of the ring a newly developed mode selecting mechanism based on phase sensitive amplification has been used. Several novel symmetry-breaking soliton-like modes are found, such as Möbius solitons, which break the fundamental symmetry of 2p-periodicity in the phase change acquired per loop: a Möbius soliton needs to travel twice around the ring to meet the initial phase condition.
A phase sensitive interaction between soliton-like modes has been discovered. This interaction provides the phase correlation between two travelling solitons if their distance is decreasing. [1] S.O. Demokritov et al. Nature 426, 159 (2003).