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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.91: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Spin Wave Propagation in Micron and Submicron Ni₈₀Fe₂₀ Stripes — •Hans Bauer, Georg Woltersdorf, and Christian Back — Universität Regensburg, 93043 Regensburg, Germany

The wavelength of propagating spin waves has often been determined in thin ferromagnetic films and more recently in structured Ni₈₀Fe₂₀ films [1][2]. Thin stripes are of particular interest for micron-sized spin wave devices as they serve as the building blocks for spin wave wave guides in future spin logic devices and spin wave Mach-Zender interferometers. For realization of such devices with only a few micron in size, the knowledge of the damping length of propagating spin waves within the structure is essential.
We used a TR-MOKE setup with 250 nm spatial resolution to study propagating magnetostatic spinwaves in micron and submicron wide Ni₈₀Fe₂₀ stripes. As the MOKE signal is proportional to the amplitude of the dynamic magnetization the wavelength and the damping length can both be directly determined at the same time. The results are compared to analytical calculations taking the excitation profile into account as well as with micromagnetic simulations.
V. E. Demidov et al., Phys. Rev. B 77, 064406 (2008)
S. Neusser et al., Phys. Rev. Lett. 105, 067208 (2010)