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The scattering of photons from spin waves (Brillouin light scattering -- BLS)is a well-established technique for the study of layered magnetic systems. Theinformation about the magnetic state and properties of the sample is containedin the frequency position, width, and intensity of the BLS peaks. Previously[Phys. Rev. B 67, 184404 (2003)], we have shown that spin wave frequencies canbe conveniently calculated within the ultrathin film approach, treating theintralayer exchange as an effective bilinear interlayer coupling between thinvirtual sheets of the ferromagnetic layers. Here we give the consequentextension of this approach to the calculation of the Brillouin light scattering(BLS) peak intensities. Given the very close relation of the BLS cross-sectionto the magneto-optic Kerr effect (MOKE), the depth-resolved longitudinal andpolar MOKE coefficients calculated numerically via the usual magneto-opticformalism can be employed in combination with the spin wave precessionalamplitudes to calculate full BLS spectra for a given magnetic system. Thisapproach allows an easy calculation of BLS intensities even for noncollinearspin configurations including the exchange modes. The formalism is applied to aFe/Cr/Fe/Ag/Fe trilayer system with one antiferromagnetically coupling spacer(Cr). Good agreement with the experimental spectra is found for a wide varietyof spin configurations.Comment: 19 pages, 5 figure

Intensity of Brillouin light scattering from spin waves in magnetic multilayers with noncollinear spin configurations: Theory and experiment