Abstract
A theory of ferromagnetic resonance is developed in which dipolar interaction is taken into account by means of the spin-wave formalism. Due to crystalline anisotropy and the poly-crystalline character of the material, the homogeneous mode of precession interacts with spin waves whose wavelength is of the order of, or larger than, the average linear grain size. The moments of the absorption line are calculated for the case of vanishingly small single-crystal linewidths. Linewidth and lineshift due to crystalline anisotropy are calculated by a perturbation-like approach in which interactions which do not involve the homogeneous mode are neglected. The theory predicts a very strong frequency- and shape-dependence of the linewidth for the case in which the homogeneous mode is approximately degenerate with long-wavelength spin waves propagating in directions perpendicular to the d.c. field.
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