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Bismuth substituted lutetium iron garnet (BLIG) films exhibit larger Faradayrotation, and have a higher Curie temperature than yttrium iron garnet. We haveobserved magnetic stripe domains and measured domain widths of 1.4 {\mu}{\mu}musing Fourier domain polarization microscopy, Faraday rotation experimentsyield a coercive field of 5 Oe. These characterizations form the basis ofmicromagnetic simulations that allow us to estimate and compare spin waveexcitations in BLIG films. We observed that these films support thermal magnonswith a precessional frequency of 7 GHz with a line width of 400 MHz. Further,we studied the dependence of precessional frequency on the externally appliedmagnetic field. Brillouin light scattering experiments and precessionfrequencies predicted by simulations show similar trend with increasing field.

Magnetization spin dynamics in a (LuBi)3Fe5O12 (BLIG) epitaxial film