Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Spin-Dynamics / Spin-Torque I

MA 2.8: Vortrag

Montag, 23. März 2009, 12:45–13:00, HSZ 04

Interaction of spin-wave envelope solitons with potential barriers and wells — •Ulf-Hendrik Hansen, Vladislav E. Demidov, and Sergej O. Demokritov — Institute for Applied Physics, University of Muenster, Corrensstr. 2-4, 48149 Muenster, Germany

The interaction of nonlinear waves with potential barriers and wells has recently attracted a strong interest, since it is believed that the tunneling-associated dynamics of nonlinear wave-packets in complex potentials can bring a new important knowledge to the physics of universal nonlinear phenomena [1]. Spin waves in thin ferromagnetic films are uniquely positioned as a flexible and convenient model nonlinear system. Recently it was demonstrated that linear spin waves can tunnel through a potential barrier, formed by an inhomogeneity of the static magnetic field [2]. Here we report an experimental study of interaction of nonlinear spin-wave packets, propagating in yittrium iron garnet films, with magnetic potential barriers and wells. We have found that the nonlinearity in the system causes a noticeable modification of this interaction in comparison to the linear case. The strongest modification is observed under conditions, where spin-wave envelope solitons are formed. Our findings show that for the case of potential barriers the solitons demonstrate an enhanced tunneling. Moreover, the nonlinear enhancement of the interaction was found to be stronger for potential wells, which was associated with its resonant character.

[1] O. Morsch and M. Oberthaler, Rev. Mod. Phys. 78, 179 (2006). [2] S.O. Demokritov et al., Phys. Rev. Lett. 93, 047201 (2004).