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The temperature and frequency dependences of the admittance real part σ(T, f) in granular (Fe45Co45Zr10)x(Al2O3)100−x nanocomposite films around the percolation threshold xC were investigated. The behaviour of σ(T, f) vs. the temperature and frequency over the ranges 77–300 K and 50 Hz–1 MHz, respectively, displays the predominance of an activation (hopping) conductance mechanism for the samples below the percolation threshold xC and of a metallic one beyond the xC determined as 54± 2 at.%. The mean hopping range d for the nanoparticles diameter D was estimated at different metallic phase content x.

acta physica polonica. a

The Features of Real Part of Admittance in the Nanocomposites (Fe45Co45Zr10)x(Al2O3)100 - xManufactured by the Ion-Beam Sputtering Technique with Ar Ions