Electrical properties in granular Co-ZrO₂ thin films
by B.J. Hattink, M. Garcia Del Muro, Z. Konstantinovic, V.F. Puntes, X. Batlle, A. Labarta, M. Varela
International Journal of Nanotechnology (IJNT), Vol. 2, No. 1/2, 2005

Abstract: Granular films composed of well-defined nanometric Co particles embedded in an insulating ZrZrO₂ matrix were prepared by laser ablation in a wide range of Co concentration. The temperature-dependent resistivity depends very critically on the Co-volume fraction with percolation threshold in the range 0.45 < x < 0.52. In the dielectric regime, AC transport arises from the competition between the inter-particle thermally assisted tunnelling (R) and capacitive (C) channels. Consequentially, a complex low-frequency absorption phenomenon is observed that mimics the universal response of disordered dielectric materials. The experimental observation can be successfully modelled by a random R-C network.

Online publication date: Sat, 30-Apr-2005

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