Abstract
The evolution of the morphology, magnetic and transport properties of Fe(t nm)/MgO(3.0 nm) multilayers with respect to the nominal metallic layer thickness wasinvestigated. A comparison with existing experimental data on discontinuousmetal–insulator multilayers, ultrathin epitaxial Fe films on MgO substrates and granularcermet films is made. It is confirmed that the deposition conditions and the materialcomposition play a crucial role in the percolation process. Nominal thicknessesof Fe layers at which an infinite metallic cluster is formed and the conditionsfor continuous Fe coverage were determined. Different methods of percolationthreshold detection were analysed. We show that investigation of the temperaturedependence of resistance in nanostructures could lead to an overestimation of thepercolation threshold value, while magnetic measurements alone could lead to itsunderestimation.
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