Electrophysical properties of granular film alloys

Abstract

The results of experimental researches of the structure and phase state and electrophysical properties of the double-component film systems based on Co and Cu or Ag, Fe and Cu, in which the granular solid solutions (s.s.) are presented. The formation of granular films was carried out as a layer condensation of superfine layers (d ≈ 0.5–3 nm) with subsequent annealing up to 850 K, and simultaneous condensation of separate components. With a total thickness of films up to 60 nm, the average size of Co magnetic granules is 3–7 nm. Parameters of the fcc lattice of a granular s.s. is a = 0.408–0.409 nm (based on Ag and Co) and a = 0.358 nm (based on Cu and Co). In multilayer films based on α-Fe and Cu formed s.s. based on α-Fe (at 1.5<dFe<2 nm) or s.s. based on Cu (at dFe<1.5 nm) with lattice parameters which are very close to the α-Fe or Cu parameter. Studies of electrophysical properties indicate that the resistivity depends to a large extent on the total concentration of the magnetic component and the temperature of the measurement. The value ρ in thermostabilized films is (1–4) × 10−7 Ω × m, and the value of the thermal coefficient of resistance β≈(0.5–1.5) × 10−3 K−1 does not depend from the samples thickness, temperature and the concentration of the magnetic component.