Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 3: Micro- and nanostructured Materials
MA 3.7: Talk
Monday, March 7, 2016, 11:15–11:30, H32
Direct Imaging of Spin Wave Propagation in Antidot Lattice based Magnonic Crystals — •Joachim Gräfe1, Ajay Gangwar2, Ambra Caprile3, Matthias Noske1, Hermann Stoll1, Christan H. Back2, Gisela Schütz1, and Eberhard J. Goering1 — 1Max Planck Institute for Intelligent Systems, Stuttgart, Germany — 2Department of Physics, University of Regensburg, Regensburg, Germany — 3Istituto Nazionale di Ricerca Metrologica, Turin, Italy
Magnonic crystals are nanostructured metamaterials with periodically alternating magnetic properties, similar to photonic crystals, which have gained significant scientific interest and can be realised by a regular lattice of holes, a so-called antidot lattice (ADL), in a magnetic thin film. As the spin wave propagation in nanoscaled ADL cannot be visualized by time resolved Kerr microscopy, typical investigations use all electrical spin wave spectroscopy or Brillouin light scattering and are unable to directly image the propagation of spin waves in nanometer sized magnonic crystals. Here, we present results from advanced time resolved x-ray microscopy (MAXYMUS@BESSY) of spin wave propagation and the mechanisms behind selective transmission or damping in these magnonic crystals. Therefore, magnon modes spanning from 250 MHz up to 8 GHz were resonantly excited and the influence of a variable applied field was investigated. These measurements allowed the direct observation of the individual modes, their interaction with the ADL, and their respective localisation within the lattice.