Structure and Electroconductivity of the Nanocrystalline CoNi Thin Film Alloys

Author(s) V.B. Loboda , V.O. Kravchenko , Yu.O. Shkurdoda
Affiliations Sumy State Pedagogical University, 87, Romenska Str., 40002, Sumy, Ukraine
Issue Volume 1, Year 2009, Number 3
Dates Received 04.12.2009, in final form 16.12.2009
Citation V.B. Loboda, V.O. Kravchenko, Yu.O. Shkurdoda, J. Nano- Electron. Phys. 1 No3, 58 (2009)
PACS Number(s) 68.37.Lp, 68.55.Jk, 73.61.At
Key words Thin ferromagnetic films, Alloy (20) , Crystal structure (6) , Phase composition, Resistivity (8) .
Structure, phase composition and electroconductivity of nanocrystalline CoNi thin film alloys are investigated. During the I-st cycle of thermal stabilization the grain size increases from approximately 5 nm to 110-200 nm. Films with Co content less than 70 mass % have the single-phase composition with the fcc-lattice. Increase in the lattice parameter, which can be described by the Vegard's rule, is observed with the growth of Co concentration. At Co content more than 75 mass % the annealed films have the two-phase fcc-hcp composition. Quadratic temperature dependence of the resistivity, which is also observed for the single-layer films of pure ferromagnetic metals, is inherent to the films of a given alloy. Using analysis of the size dependences of electroconductivity the concentration dependence of the resistivity is plotted.