Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.61: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

Brillouin light scattering observation of the spin wave dynamics in magnonic crystals — •Andrii Chumak, Alexander Serga, and Burkard Hillebrands — FB Physik and FSP MINAS, TU Kaiserslautern, Germany

Artificial media based on periodic magnetic structures, so-called magnonic crystals, offer wide tunability of their electromagnetic parameters and are an excellent object for the investigation of linear and nonlinear spin-wave dynamics. We report on the design and test of one-dimensional yttrium-iron-garnet (YIG) film-based magnonic crystals. The periodical structure of grooves on the film surface was produced using photolithography and chemical etching techniques. The grooves were perpendicularly oriented with respect to the spin-wave propagation direction. The microwave spectra were measured for different crystal geometrical parameters and, in particular, for different depth of the grooves. Spectrum rejection bands were clearly observed. The bands width and deepness increase with increasing grooves depth. This can be explained by an increase of the interaction of the "pure" magnonic crystal (groove structure on the YIG film surface) with the underlaying uniform magnetic film. The reflection of spin wave packets, compression and localization (storage) in the magnonic crystal area were detected using the space- and time-resolved Brillouin light scattering technique.