Ferromagnetic resonance in granular thin films

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Abstract
A theoretical analysis has been done of the effects of granule size, shape, orientation, and concentration and the temperature effects on the ferromagnetic resonance (FMR) field H r in granular thin films. The granular Co x Ag 1−x thin films with 0.2<x<0.85 (the volumetric filling factor 0.17<ff p . For the Co–Ag system, persistence of a considerable SPM fraction is revealed by the superconducting quantum interference device data up to the highest f, and the effect at f=f p consists in a discontinuous jump of the H r (f) slope. Otherwise, the FMR data for granular Fe–SiO 2 films reveal a discontinuous jump in H r itself at f≈0.28. The latter can indicate a 1st kind-like magnetic percolation transition in that material. Thus FMR studies can effectively probe the internal structural processes in granular magnetic systems.