The Concentration Behavior of the Anomalous Hall Effect in Granulated Fe/SiO_2 Films in the Percolation Transition Region

摘要

The Hall effect is investigated in composite films prepared on the basis of nanogranules of iron in a dielectric matrix of SiO_2 below the percolation threshold. The behavior of the Hall effect is studied in the vicinity of percolation transition with decreasing metal content. It is found that the decrease in the Hall field on approaching the transition on the melt side is nonmonotonic, namely, it is accompanied by the emergence of a minimum. A qualitative 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.