Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 73: Spincaloric Transport II (jointly with MA)

TT 73.4: Talk

Wednesday, March 18, 2015, 15:45–16:00, H 0110

Spin-wave propagation through a magnonic crystal in a thermal gradient — •Thomas Langner, Andrii V. Chumak, Alexander A. Serga, Burkard Hillebrands, and Vitaliy I. Vasyuchka — Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern

Spin waves show a high potential to transport information in form of spin angular momentum. Magnonic crystals (MC), spin-wave waveguides with a periodic modulation of the magnetic properties, provide possibilities to code and process data in manifold ways. For the application of MC-based spin-wave devices it is of crucial importance to understand their behavior in thermally inhomogeneous surroundings since local heating might appear in real devices. We present studies on the dynamics of coherently excited spin waves in thermal gradients applied to a MC in form of an yttrium iron garnet (YIG) waveguide of varied thickness. We observe a broadening of the frequency bandgaps, the regions where spin-wave propagation is forbidden, as well as a decrease in the transmitted signal compared to the equilibrium temperature case. The mechanisms leading to these effects are discussed. The experimental results are accompanied by numerical calculations. A T-matrix formalism that includes the changes of the magnetic parameters induced by thermal gradients is used. We acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG) within priority program 1538 “Spin Caloric Transport“.