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MA: Fachverband Magnetismus

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

MA 50.6: Vortrag

Freitag, 30. März 2012, 10:45–11:00, EB 301

Magnon mediated heat transport in a magnetic insulator — •Vitaliy I. Vasyuchka, Alexander A. Serga, Andrii V. Chumak, and Burkard Hillebrands — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

In a magnetic system thermal gradients can appear as a natural result of thermalization of artificially excited magnons. Detection and measurement of such gradients provides information about the heat transport by magnon currents. In our experiments, the temperature gradient created by coherent surface and volume magnons excited in a tangentially magnetized yttrium iron garnet (YIG) film was detected using an infrared thermography technique. In the case of volume magnons the temperature distribution along the YIG film was found symmetrical relative to the antenna, while the thermalization of the surface magnons results in an unsymmetrical distribution. Moreover, the shift of the temperature maximum apart from the antenna was registered in the case of surface magnons. The difference in the temperature profiles is understood as a result of a nonreciprocal propagation of surface magnons. The time dynamics of the magnon-induced thermal gradients was studied.

Financial support by the Deutsche Forschungsgemeinschaft (DFG, VA 735/1-1) within Priority Program 1538 "Spin Caloric Transport" is gratefully acknowledged.