Thin overlayer influence on electrophysical properties of nickel films

Abstract

In this work it is experimentally investigated a size effect in temperature coefficient of resistance (ТCR) of Ni films with Cu and SiO 2 thin overlayer. The parameters of electrical transfer (the mean-free path of electron, the reflectivity coefficient of the external surfaces, the reflection and transmission coefficients at the grain boundary) were calculations. Decreasing of the value of the reflectivity coefficient is due to the change of the surface microrelief. It is show that the value of TCR decreases caused by the conditions of scattering changes on internal and external boundaries.

Magnetic and Magnetoresistance Properties of Films of the Ferromagnetic Metals

“…Дослідження структурно-фазового стану одношарових плівок Ni показали, що в свіжосконденсованому стані та після термооброблення до Т в  700 К електронографічно фіксується лише ГЦК-фаза Ni, що відповідає даним робіт інших авторів [12,13].…”

Research of Conductivity in Polycrystalline Films with a Thin Coating Using the Modified Mayadas–Shatzkes Model

“…Those relations include the parameters of charge transfer, such as the parameter of specular reflection , the mean free path of electrons , and the parameter of grain-boundary scattering , which depends on the coefficient of electron scattering by grain boundaries, . When calculating the specific conductance on the basis of formulas (5) and (6), we used the parameters obtained earlier in our works [17][18][19], when analyzing the experimental dependences of the temperature coefficient of film resistance on the film thickness measured for Cu, Ni, and Co films. Besides that, the indicated parameters were calculated for the films of those metals with a coating making use of a linearized model and the Tellier-Tosser-Pichard (TTP) model of isotropic scattering [20].…”

“…In the case of Eq. (5), the value of 1 was selected to be the coefficient of specular reflection from the film surface without the coating, which was obtained in the framework of the isotropic TTP model [17], and 2 was the parameter of specular reflection from the film surface with the coating. In relation (6), the parameter is the coefficient of specular reflection from the film surface with the coating.…”

“…In relation (6), the parameter is the coefficient of specular reflection from the film surface with the coating. Evidently, the former approach is more accurate, although it is practically impossible to resolve the contribution of scattering at each film surface into the magnitude of the parameter , when treating the experimental results of works [17][18][19] in the framework of the isotropic TTP model.…”

Electrical resistance behavior of vinylester composites filled with glass-carbon hybrid fibers

“…And they focused on the PTC or NTC effect of the conducting composites and the mechanisms of these effects, as well as the synergy effects among the different fillers in composites and between the fillers and polymer matrix. Some researchers have reported the inorganic 0 TCR materials [13,14] . However, there is little report on low TCR conducting polymer composite.…”