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MA: Fachverband Magnetismus

MA 9: Micromagnetism/Computational Magnetics

MA 9.6: Vortrag

Montag, 25. Februar 2008, 18:00–18:15, H 1012

Computer experiments on standing spin wave resonances using Landau-Lifshitz-Gilbert dynamics — •Robert Wieser, Elena Y. Vedmedenko, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg

A new method to explore standing spin wave patterns based on the solution of the Landau-Lifshitz-Gilbert equation in two-dimensional nanostructures will be presented. We calculate numerically the power spectrum P of magnetic moments in an oscillating field. The simulations are directly comparable with classical ferromagnetic resonance experiments, where the imaginary part of the susceptibility χ″ ∝ P is observed. The advantage of this method is the direct information about the position and phase of the spin wave resonance as function of frequency or external magnetic field.

In the second part of the talk, the temperature dependence of the resonance spectrum of Fe/Ag(111) will be discussed. The temperature causes a shift in the T=0 resonance peaks as well as additional spin wave patterns.

ACKNOWLEDGMENTS: This work has been supported by the Deutsche Forschungsgemeinschaft (SFB 668).