Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)x(Al2O3)1-x films

[摘要] The present paper investigates conductivity sigma for a wide temperature range of 2 K < T < 300 K in the nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films (1-6 mu m thicknesses, 0.30 < x < 1.00) which were sputtered on glass-ceramic substrates from the compound target in vacuum chamber filled with Ar (set 1 films) or Ar + O-2 gas mixture (set 2 films). TEM and HRTEM images revealed that granular films of set 1 containing nanosized crystalline metallic bcc alpha-FeCo-based nanoparticles embedded in the amorphous Al2O3 matrix. In case of Ar + O atmosphere of deposited alpha-FeCo-based crystalline cores with stabilized sizes were covered with an amorphous FeCo-based oxide shells. The sigma(T) dependences were found to be in agreement with this phase structure. They show transition of the set 1 films sigma(T) curves with x from tunneling (hopping) behavior below the percolation threshold x < x(c) approximate to 0.46 to metallic one for x > x(c). Moreover, as opposed to such behavior, for the set 2 films hopping mechanism of sigma(T) was revealed far beyond x(c) due to the formation of semiconducting FeCo-based oxide shells separating electrically contacting FeCoZr cores. (C) 2013 Elsevier B.V. All rights reserved.

[发布日期] 2014-12-05

[效力级别]  Proceedings Paper

[关键词] Electronic transport;Nanocomposites;Percolation