The concentration behavior of the anomalous hall effect in granulated Fe/SiO2 films in the percolation transition region

The Hall effect is investigated in composite films prepared on the basis of nanogranules of iron in a dielectric matrix of SiO2 below the percolation threshold. The behavior of the Hall effect is studied in the vicinity of pe rcolation transition with decreasing metal content. It is found that the de crease in the Hall field on approaching the transition on the metal side is nonmonotonic, namely, it is accompanied by the emergence of a minimum. A q ualitative model of concentration behavior of the Hall effect is suggested, which is based on the notions of singularities of the conductivity of two- phase systems in the vicinity of the percolation threshold.