Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Spin Dynamics / Spin Torque I

MA 19.9: Vortrag

Mittwoch, 27. Februar 2008, 16:00–16:15, EB 301

Spin waves in curved Ni₈₁Fe₁₉ nanowires in the presence of domain walls — •Christian W. Sandweg, Sebastian J. Hermsdörfer, Helmut Schultheiss, P.Andreas Beck, Britta Leven, and Burkard Hillebrands — FB Physik and FSP MINAS, TU Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern, Germany

We present a study of spin-wave properties in curved Ni₈₁Fe₁₉ nanowires in the presence of domain walls. The spin-wave spectra are detected with a lateral resolution of 300 nm employing Brillouin light scattering microscopy. The elements are prepared using a combination of EBL and MBE. The structure dimensions are a radius of 10 µm, a width of 500 nm and a thickness of 10 nm. A protrusion with a radius of 250 nm acts as artificial domain wall pinning site. In the absence of a domain wall we observe typical spin wave quantization effects due to the lateral confinement in radial direction. In contrast, in the presence of a domain wall the quantized wave profile is distorted in the vicinity of the domain wall due to the variation of the internal magnetic field. The domain structure was investigated by Lorentz microscopy in collaboration with the group of John Chapman, Glasgow university. First results on artificially excited spin waves as well as their decay length in Ni₈₁Fe₁₉ are presented. Technical support by the Nano+Bio Center of the TU Kaiserslautern and financial support by the DFG within SPP1133, the EU-MRTN SPINSWITCH (MRTN-CT-2006-035327) and the NEDO grant No 2004IT093 is acknowledged.