Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.63: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Spin-wave quantization in nanoscaled magnetic rings — •Sebastian Schäfer1, Helmut Schultheiß1, Patrizio Candeloro1, Hans T. Nembach2, Peter Andreas Beck1, Britta Leven1, Andrei N. Slavin3, and Burkard Hillebrands1 — 1FB Physik and Forschungsschwerpunkt MINAS, TU Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern — 2NIST, Boulder, Colorado, USA — 3Oakland University, Rochester, Michigan, USA
Spin dynamics in small confined structures is interesting with respect to fundamental understanding as well as in view of applications in, e.g. magnetic memory or logic devices. The eigenmode spectra of small magnetic elements were discussed extensevily in the past. Yet the question of (de-)coherence of spin waves was not adressed so far, even though this is an essential requirement for an eigenmode system. Spin wave spectra in mesoscopic magnetic ring structures made of Permalloy with a thickness of 15 nm, diameters ranging from 1 to 3 µm and radii from 100 to 300 nm respectively, are investigated by means of micro focus Brillouin light scattering spectroscopy. The two predominant remanent magnetic configurations of the ring structures, the so called onion and the vortex state, and their switching behavior were studied extensively. Model calculations and dynamic micromagnetic simulations using the OOMMF code reveal excellent agreement with our experimental results. This work is supported by the DPG within the SPP1133 and the Japanese government within the NEDO project 2004IT093.