Abstract
The differential cross section of the spherical pores in ferrimagnetic materials is calculated by using the Born approximation in scattering theory. Using this scattering cross section, the theory is developed for evaluating the wave-vector dependence of the spin-wave linewidth. The wave-vector dependence of the spin-wave linewidth is $\frac{1}{k}$ in the long-wavelength region and is proportional to $k$ for the short-wavelength region, where $k$ is the wave vector of the spin waves. The present theory indicates that the spin-wave linewidth is a function of the number of pores and their radii. Agreement between the formula and the experimental results is good except in the region very near $k\ensuremath{\approx}0$.
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