Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 73: Spincaloric Transport II (jointly with MA)
TT 73.8: Vortrag
Mittwoch, 18. März 2015, 16:45–17:00, H 0110
Optically-Reconfigurable Dynamic Magnetic Materials for the Control of Spin Waves — •Marc Vogel1, Andrii V. Chumak1, Erik H. Waller1, Thomas Langner1, Vitaliy I. Vasyuchka1, Burkard Hillebrands1, and Georg von Freymann1,2 — 1Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Str. 56, 67663 Kaiserslautern, Germany — 2Fraunhofer-Institute for Physical Measurement Techniques IPM, Erwin-Schroedinger-Str. 56, 67663 Kaiserslautern, Germany
Spin waves - eigen excitations of the electrons' spin system - are of special importance nowadays due to the large potential for applications (e.g. processing, filtering or short-time storage of data). While all these applications rely on pre-defined constant structures, a dynamic variation of the structures opens access to novel physical phenomena and to novel applications. Here, we present the realization of such dynamic two-dimensional magnetic materials. By using laser light and a spatial light modulator, we reconstruct computer generated holograms on a ferrimagnetic yttrium iron garnet spin-wave waveguide. A black absorber (including carbon black nanoparticles) absorbs the light and creates thermal landscapes in the magnetic medium. The local change in temperature results in landscapes of the saturation magnetization. An acousto-optical modulator controls the temporal heating. Thus, the spin-wave characteristics can be controlled both in space and in time. The proposed fully-reconfigurable magnetic material is demonstrated using examples of one- and two-dimensional magnonic crystals.