  Spatially resolved measurements of the magnetization dynamics induced by an
intense laser pump-pulse reveal that the frequencies of resulting spin wave
modes depend strongly on the distance to the pump center. This can be
attributed to a laser generated temperature profile. On a CoFeB thin film
magnonic crystal, Damon-Eshbach modes are expected to propagate away from the
point of excitation. The experiments show that this propagation is frustrated
by the strong temperature gradient
