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We have analyzed the microwave behavior of soft nanogranular [([Fe.sub.0.7] [Co.sub.0.3]).sub.71]B.sub.22][Ni.sub.7] films which present a de permeability from 60 to 280, a resistivity of 8 to 9 [10.sup.-7] [OMEGA] m and a zero-field double ferromagnetic resonance peak at frequencies ranging from 3.8 to 8.35 GHz. The high frequency and large line-width of the observed resonances allows for possible applications in microwave absorbers in a frequency range extending from 6 to 10 GHz. Index Terms--Anisotropy, FeCo films, ferromagnetic resonance, magnetic thin films, microwave properties, nanogranular films.

We have investigated the microwave properties of a set of Co-Fe-Al-O films with different thicknesses. The films show a well-defined in-plane anisotropy due to the bias field applied during deposition. The resonance frequency is determined through the scattering parameters measured with a vector network analyzer and a probing station connected to a coplanar waveguide. The results show that the resonance peak features depend on the direction of the applied/RF field and on the applied field history. Index Terms--Anisotropy, FeCo films, ferromagnetic resonance, magnetic thin films, microwave properties, nanogranular films.

We have analyzed the microwave behavior of soft nanogranular (Fe0.7Co0.3)71B22Ni7 films which present a dc permeability from 60 to 280, a resistivity of 8 to 9 10-7 Ω m and a zero-field double ferromagnetic resonance peak at frequencies ranging from 3.8 to 8.35 GHz. The high frequency and large line-width of the observed resonances allows for possible applications in microwave absorbers in a frequency range extending from 6 to 10 GHz. [ABSTRACT FROM AUTHOR]