Calculation of the flicker noise in metal-insulator composites using a mean-field theory

L. F. Fonseca*, I. Balberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The effective resistance and normalized 1/f noise intensity for a metal-insulator composite material is calculated as a function of the metal volume fraction x, for x larger than the conduction threshold. The calculations are made using the effective-medium approach and zero tunneling conductance. The conductance and noise due to the metallic links, and their dependence on geometry and concentration are considered. In the proposed model, the effective resistance and noise are obtained using flat distribution of the geometrical factor. The model is applied to the Pt/ Al2O3 composites discussed by Mantese, Curtin and Webb (1) and good agreement is obtained with their reported experimental results. The experimental behavior of the noise above the threshold is explained without the contribution of tunneling mechanism.

Original languageEnglish
Pages (from-to)169-173
Number of pages5
JournalNanostructured Materials
Volume3
Issue number1-6
DOIs
StatePublished - 1993

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