Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.13: Poster

Friday, April 4, 2014, 10:30–13:30, P2

Spin-wave control by thermal gradients — •Thomas Langner, Marc Vogel, Vitaliy Vasyuchka, Andrii Chumak, Alexander Serga, Georg von Freymann, and Burkard Hillebrands — TU Kaiserslautern and Landesforschungszentrum OPTIMAS

Spin waves, excitations of the spin system in a ferromagnetic material, show a high potential to transport information in form of spin angular momentum. In order to code and process data with spin waves one has to provide suitable means of manipulation. Magnonic crystals, magnetic media with periodic variation of the magnetic properties, provide a possibility to create a spin wave filter in analogy to photonic crystal based filters for light. In this work we investigate possibilities to create laser induced magnonic crystals. 532 nm continuous-wave laser-light patterns are generated by a spatial light modulator and imaged onto a spin-wave waveguide. The optically heated areas have a different saturation magnetization influencing the spin-wave propagation. First we study transmission and reflection of spin waves through a single thermally induced barrier. We then increase the number of light fringes focused to investigate the formation of a magnonic crystal and its influence on spin-wave transport. Controlling the laser power, heating time and distance between the fringes provides us with full control of all magnonic crystal parameters without the need to fabricate several samples.

We acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG) within priority program 1538 (Spin Caloric Transport).