Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Spin-Dynamics / Spin-Torque I

MA 2.6: Vortrag

Montag, 23. März 2009, 12:15–12:30, HSZ 04

Spin-wave signal recovering under influence of multipulse parametric pumping — •Sebastian Schäfer, Volker Kegel, Alexander A. Serga, and Burkard Hillebrands — FB Physik und Landesforschungszentrum 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).