Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 8: Spindynamik I
MA 8.4: Vortrag
Freitag, 4. März 2005, 16:00–16:15, TU H1028
Spin-Wave Eigenmodes of Permalloy Squares with Closure Domain Structure — •Korbinian Perzlmaier1, Matthias Buess1, Christian H. Back1, Vladislav E. Demidov2, Burkard Hillebrands2, and Sergej O. Demokritov3 — 1Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, D-93040 Regensburg, Germany — 2Fachbereich Physik und Forschungsschwerpunkt MINAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany — 3Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, D-48149 Münster, Germany
We investigate the magnetization dynamics of 16nm thick and 4 µm wide permalloy squares in a closure domain state using two complementary experimental techniques: Time Resolved Scanning Kerr Micoroscopy (TRSKEM) and Micro Focus Brillouin Light Scattering (µBLS). In the µBLS case, the spin wave spectrum is imaged for a sample excited perpendicularly at different frequencies, while in the TRSKEM case the response of the out-of plane component of the sample’s magnetization upon a fast rise time perpendicular field pulse excitation is recorded in the time domain. In the latter case, the mode structure is then extracted using Fourier Transformation. In addition to a low-frequency mode localized in the domain walls, additional modes in the domains with a main quantization perpendicular to the static magnetization were detected. While TRSKEM is better suited for the observation of low frequency modes, BLS yields better results for modes at higher frequencies. In the overlap of these two frequency spaces, good agreement can be found.