Hall effect in insulating Fe/SiO2 magnetic granular films

We present the results of the anomalous Hall effect investigations under th e hopping transport regime. The Hall effect and magnetic measurements were performed in Fe/SiO2 nanocomposites at the insulator side of percolation tr ansition. Unlike magnetic metals, in studied materials Hall effect is deter mined by non-direct electron tunneling between granules. The Hall effect de pendence on the Fe content is non-monotonous and is in agreement with the S hklovskii, Dykhne theoretical predictions for the Hall effect in percolatin g systems. (C) 2000 Elsevier Science B.V. All rights reserved.