Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.74: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

Multiple spin-wave pulse recovery by parallel pumping — •Volker Kegel, Sebastian Schäfer, Alexander A. Serga, and Burkard Hillebrands — FB Physik und Forschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

We have studied the storage and parametrically stimulated recovery of microwave signals in a tangentially magnetized yttrium-iron-garnet (YIG) ferrite film. The microwave signal carried by a packet of magnetostatic surface spin waves (MSSW) is stored due to the excitation of dipolar-exchange standing spin-wave modes across the film thickness. A recovered MSSW packet appears in the film as a result of parametric amplification of one of these standing modes [1]. The recovery delay time as well as the duration and amplitude of the recovered signal are mostly controlled by the power of the pumping signal. Here we report on the behaviour of the spin-wave system under influence of multiple pumping pulses applied per one MSSW signal pulse. We demonstrate the ability of a multiple recovery process and discuss the dependence of its characteristics on the time interval between pumping pulses. Financial support by the DFG (SFB/TRR 49) is acknowledged.

[1] A.A. Serga, A.V. Chumak, A. Andre, G.A. Melkov, A.N. Slavin, S.O. Demokritov, and B. Hillebrands, PRL 99, 227202 (2007).