Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Micromagnetism / Computational Magnetics

MA 20.2: Vortrag

Mittwoch, 24. März 2010, 17:15–17:30, H22

Domain wall motion damped by the emission of spin waves — •Robert Wieser, Elena Y. Vedmedenko, and Roland Wiesendanger — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany

The domain wall motion of field driven transverse domain walls in biaxial ferromagnets is investigated by solving the Landau-Lifshitz-Gilbert equation. It is demonstrated that with increasing easy plane or hard axis anisotropy D_h different types of domain wall motion occur: The different scenarios correspond to different velocity equations. In the limit of absent hard axis anisotropy (D_h/J = 0) a precessional domain wall motion can be found, while for D_h/J ≠ 0 a steady domain wall motion interrupted by a Walker breakdown at high fields prevails. In the limit of huge anisotropies (D_h/J ≫ 0) a domain wall motion damped by emission of spin waves occurs. The emitted spin waves have been analyzed with aid of a spatial and a temporal Fourier transformation to give the corresponding energy dispersion. Furthermore, the connection between magnetic systems and the theory of solitons is discussed.
This work has been supported by the Deutsche Forschungsgemeinschaft in the framework of subproject B3 of the SFB 668 and by the Cluster of Excellence "Nanospintronics".