Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 5: Micro- and Nanostructured Magnetic Materials I

MA 5.6: Talk

Monday, March 22, 2010, 12:15–12:30, H23

Spin-wave propagation in a microstructured magnonic crystal — •Andrii V. Chumak¹, Philipp Pirro¹, Alexander A. Serga¹, Mikhail P. Kostylev², Robert L. Stamps², Helmut Schultheiss¹, Katrin Vogt¹, Sebastian J. Hermsdoerfer¹, Bert Laegel¹, P. Andreas Beck¹, and Burkard Hillebrands¹ — ¹FB Physik, Nano+Bio Center, and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — ²School of Physics, University of Western Australia, Crawley, Western Australia 6009, Australia

The transmission of spin waves through a magnonic crystal fabricated as permalloy (Py) waveguide with a periodically variable width was studied experimentally and theoretically. Electron beam lithography, molecular beam epitaxy, and lift-off process were used to fabricate the magnonic crystal in the form of a 40 nm thick Py stripe of periodically variable width between 2.5 μm and 1.5 μm. The lattice constant of the magnonic crystal is 1 μm. A bias magnetic field was applied perpendicularly to the waveguide in the film plane. Spin waves were excited by a 1 μm wide copper antenna and their characteristics were measured by spatially-resolved Brillouin light scattering microscopy. A rejection frequency band, where spin waves are not allowed to propagate, was clearly observed. The band gap frequency can be tuned in the range from 6.5 to 9 GHz by varying the applied magnetic field. The measured spin-wave intensity as a function of frequency and propagation distance is in good agreement with model calculations.

Financial support by the DFG within SE 1771/1-1 is acknowledged.