Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 31: Postersitzung II

MM 31.41: Poster

Mittwoch, 16. März 2011, 17:15–18:45, P5

Spin wave modes in magnetic nanostructures as seen by Ferromagnetic Resonance — •Sven Stienen, Ralf Meckenstock, Christoph Hassel, Jürgen Lindner, Nathalie Reckers, and Michael Farle — Fakultät für Physik and Center for Nanointegration (CeNIDE), Universität Duisburg-Essen, Lotharstraße 1, 47057 Duisburg

Micromagnetic simulations using the 3D Object Orientated Micromagnetic Framework (OOMMF) software were performed for a permalloy (Py) stripes arranged in a the form of crosses. In difference to most previous work, we apply a small time-dependent magnetic field with a fixed frequency (10GHz) to simulate the microwave field used in ferromagnetic resonance (FMR). Different spin wave excitations like the uniform, edge and not-aligned modes can be identified and visualized in time and space. In the simulation an external in-plane angular dependent magnetic field is varied between 0mT and 400mT yielding spectra as in the experimental ferromagnetic resonance. These simulated spetra are compared to experimental spectra of structured samples. Our simulation yields visualizations of the distribution of the excitation inside the stripes thus unambiguously identifying more than 10 different modes occurring in the stripes. These simulated images and spectra are helpful to find the best conditions for locally resolved ferromagnetic resonance measurements. This work has been supported by the Deutsche Forschungsgemeinschaft (DFG) via SFB 491.