Magneto-impedance in Fe73.5Cu1Nb3Si13.5B9 amorphous films at microwave frequencies

In this work MI studies in films of amorphous Fe73.5Cu1Nb3Si13.5B9 with thickness between 50 nm and 20 μm under frequencies up to 1.8 GHz are presented. The real and imaginary parts of the impedance were measured using a specially developed sample holder which makes use of a strip line like configuration. The dependence of the impedance on film thickness and annealing conditions are investigated. Evidences of FMR features are observed in the as-deposited and annealed samples