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 15.61: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Spin waves in semi-circular Permalloy ring segments in the presence of domain walls — •Christian Sandweg, Helmut Schultheiss, Sebastian Hermsdörfer, Peter Andreas Beck, Britta Leven, and Burkard Hillebrands — Fachbereich Physik and Forschungsschwerpunkt MINAS, TU Kaiserslautern, Germany

Semi-circular Ni₈₁Fe₁₉ ring segments are interesting systems to investigate spin wave properties in confined dimensions. The ring segments have a radius of 10 µm, a width of 500 nm and a thickness of 10 nm. A 200 nm wide protrusion has been added in the pole of the ring segment in order to create a nucleation site for a domain wall if an external field in radial direction is applied. Thereby it is possible to study spin wave spectra in the structure both in the presence and the absence of a domain wall just by applying an external magnetic field in radial or tangential direction, respectively. The ring segments have been prepared employing a combination of electron beam lithography using a lift-off process and molecular beam epitaxy. The spin waves have been detected with a spatial resolution of 300 nm by means of micro-focus Brillouin light scattering spectroscopy. The experiments reveal the typical spin wave quantization effects as expected in confined structures. However, in the presence of a domain wall the quantized wave profile is distorted in its vicinity as a result of the variation of the internal magnetic field. The authors acknowledge support of the Nano+Bio Center of the TU Kaiserslautern during sample preparation and financial support by the DFG within the SPP1133 and the NEDO project No 2004IT093 funded by the Japanese government.