Abstract
We present micromagnetic simulations of the spin-wave spectra in Landau domain patterns. Ultrashort field pulses of various spatial symmetries are used to excite distinct spin-wave eigenmodes. The frequencies as well as the symmetry of the mode patterns depend on the symmetry of the exciting torque. The latter is determined by the symmetries of the field pulse and the magnetic ground state. Landau domain patterns have collective excitations, i.e., the spin-wave modes cannot be considered for each domain individually. We find transversal modes as well as longitudinal modes as observed experimentally. From the mode profiles an effective dispersion relation is deduced which resembles the dispersion relation for infinitely extended thin films.
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