Abstract
A series of granular thin films of compositions Co x Cu 100− x (11⩽ x⩽45) and 150 nm thickness are deposited on mica and glass substrates by the electron beam evaporation technique. Structural and morphological investigations are made by X-ray diffraction, electron diffraction and transmission electron microscopic techniques. Films are nanocrystalline and the crystallite size increases upon annealing at 400°C/0.5 h in vacuum. The magnetization and magnetoresistance of the films are measured. Films with cobalt concentration lower than 13 at% show superparamagnetic and giant magnetoresistance behavior and for Co concentration higher than 30 at% show anisotropic magnetoresistive behavior. Annealed films of compositions (17⩽ x⩽25) show maximum GMR of 5–6% in a magnetic field of 9 kOe.
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