Berlin 2005 – scientific programme

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MA: Magnetismus

MA 8: Spindynamik I

MA 8.6: Talk

Friday, March 4, 2005, 16:30–16:45, TU H1028

Stopping of spin wave pulses using a non-stationary bias magnetic field — •Alexander A. Serga¹, Alexander André¹, Burkard Hillebrands¹, Thomas Schneider¹, 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 new phenomenon of phase-coherent recovery of a spin wave packet stopped and stored in standing spin waves was observed. The process is realized by means of a local alteration of the applied magnetic field. The field change shifts temporarily the dispersion curve in frequency and converts the modes comprising the spin wave packet from magnetostatic surface wave modes into exchange standing spin waves and vice versa. The converted standing spin waves were conserved for a storage time much larger than the spin wave relaxation time using parallel parametric pumping applied to the magnetic medium. The restored propagating spin wave packet preserves its phase coherency with the initial input packet irrespective of the initial phase of the parametrical pumping and the conservation time.