FERROMAGNETIC-RESONANCE AND EDDY CURRENTS IN HIGH-PERMEABLE THIN-FILMS

The effect of eddy currents and ferromagnetic resonance (FMR) on the f requency dependence of the permeability of FeTaN thin films is studied . An equation is given that describes the combination of these two eff ects. The agreement between the theoretical calculations and the exper imental data is excellent. Already at 1 MHz the imaginary part of the permeability is significantly changed by FMR. Above 10 MHz the real pa rt of the permeability is decreased by FMR. The combined effect is bes t observed in extremely high permeable, 1 mu m thick films. A value fo r the ferromagnetic damping constant is obtained. (C) 1997 American In stitute of Physics.