Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.85: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Dissipation and coupling of spin-wave eigenmodes in nano-scaled magnetic ring structures — •Katrin Vogt, Helmut Schultheiß, Björn Obry, Christian Sandweg, Sebastian Hermsdörfer, Sebastian Schäfer, Britta Leven, and Burkard Hillebrands — Fachbereich Physik and Research Center OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

Small magnetic ring structures magnetized in the onion state exhibit two spin-wave eigenmode systems confined at the pole and equatorial positions, respectively. With time-resolved Brillouin light scattering microscopy we analyzed the decay of these spin-wave eigenmodes after the resonant excitation with a microwave pulse. A strong dependency on the position within a single ring was found for the lifetime of the excited spin-wave eigenmodes showing that the damping of the magnetization dynamics is not constant within a single magnetic element. Furthermore, we demonstrate that the eigenmode frequencies can be tuned by means of an externally applied field. For certain frequency ratios of the eigenmode frequencies at the pole and equatorial position a nonlocal coupling of spin-wave eigenmodes is observed. Energy is transferred from spin-wave eigenmodes confined in the poles of the ring to spin waves at the equator if the frequency ratio is an integer number. Financial support by the DFG (SPP1133) is acknowledged.