Hopping conductivity with the “1/2” law in the multilayer nanocomposite [(Co$_{40}$Fe$_{40}$B$_{20}$)$_{34}$ (SiO$_{2}$)$_{66}$/C]$_{47}$

The temperature dependence of the longitudinal electrical resistance in the multilayer nanocomposites [(Co$_{40}$Fe$_{40}$B$_{20}$)$_{34}$ (SiO$_{2}$)$_{66}$/C]$_{47}$ containing 47 amorphous metal–dielectric/carbon bilayers prepared by ion-beam sputtering and differing in the thickness of the carbon layer has been investigated. It has been found that the electrical conductivity of these multilayer structures has a hopping character with the Efros–Shklovskii law “1/2”, and the characteristic temperature depends linearly on the thickness of the carbon layer.