Abstract
Domain wall oscillation in a pinning potential is described analytically in a one-dimensional model for the field-driven case. A proper description of the pinning potential has to go beyond harmonic contributions. Oscillations of a domain wall are observed by time-resolved magnetic soft x-ray microscopy. It is shown that nonharmonic terms are present in real samples with a strong restoring potential. In the framework of our model we gain deep insight into the domain wall motion by looking at different phase spaces. The corrections of the harmonic potential can change the motion of the domain wall significantly. The damping parameter of permalloy is determined via the direct imaging technique.
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