Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Joint Session "Spincaloric Transport" (jointly with TT)

MA 50.4: Vortrag

Freitag, 30. März 2012, 10:15–10:30, EB 301

Spin-wave propagation and transformation in a thermal gradient — •Björn Obry, Vitaliy I. Vasyuchka, Andrii V. Chumak, Alexander A. Serga, and Burkard Hillebrands — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

We study the influence of a thermal gradient on the propagation behavior of spin waves in an yttrium iron garnet (YIG) waveguide. It is shown that the propagation of externally excited spin waves in regions of varying temperature results in a modification of the spin-wave wavelength. In a special case also the reflection of spin waves in a thermal gradient is observed. These observations can be attributed to a continuous change of saturation magnetization depending on the local temperature. The presented results reveal the potential of thermal gradients for the controlled manipulation of spin-wave propagation in waveguides. Financial support by the Deutsche Forschungsgemeinschaft (DFG, VA 735/1-1) within Priority Program 1538 "Spin Caloric Transport" is gratefully acknowledged.