Abstract
We report a theoretical and experimental investigation of standing spin wave (SSW) spectra of amorphous soft ferromagnetic thin films. The experiments were performed on Co 1 - x Zr x amorphous thin films as a function of Zr concentration. The observed systematic variations of the experimental spectra and theoretical consideration lead us to eliminate deposition related inhomogeneities or the surface anisotropy as the origin of the pinning process. A new theoretical model is proposed where the pinning of the SSW modes is explained by the random local anisotropy K 1 which is an intrinsic inhomogeneity related to the amorphous structure. This structure is simulated by a model of small exchange coupled cubic cells where only the direction of K 1 varies randomly from cell to cell. For small K 1 and large applied field one can obtain explicit expressions for the dispersion relationship and mode intensities for perpendicular resonance. The overall characteristics of the experimental spectra are well explained by the present model. The values of exchange constant D and K 1 can be deduced from the features of the spectra. The variation of K 1 with concentration are discussed in term of the single-ion anisotropy model and structural investigations.
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