Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 49: Magnetization Dynamics III of 3

MA 49.8: Talk

Friday, March 15, 2013, 11:15–11:30, H22

Spin waves in a microstructured metallic magnonic crystal with periodic variation of the saturation magnetization — •Björn Obry¹, Thomas Brächer^1,2, Philipp Pirro¹, Andrii V. Chumak¹, Florin Ciubotaru¹, Alexander A. Serga¹, Julia Osten³, Jürgen Fassbender³, and Burkard Hillebrands¹ — ¹FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — ²Graduate School Materials Science in Mainz, 67663 Kaiserslautern, Germany — ³Institut für Ionenstrahlphysik und Materialforschung, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany, and TU Dresden, 01062 Dresden, Germany

We study spin waves in a microstructured magnonic crystal consisting of a Ni₈₁Fe₁₉ (Permalloy) waveguide with a periodic variation of the saturation magnetization M_S. By localized ion implantation of the waveguide a modification of the saturation magnetization to M_S/M_S⁰ = 0.93 has been obtained. Brillouin light scattering microscopy measurements of the spin-wave propagation spectrum yield two pronounced band gaps, where spin-wave propagation is prohibited. Two cases of the spin-wave excitation inside and outside the magnonic crystal region are presented. Due to the narrow band gaps achieved by the absence of topographical structuring and due to the existence of nonlinear multi-magnon interactions this magnonic crystal allows for a deeper insight into the general wave dynamics in metamaterials.