ELECTRODEPOSITION AND CHARACTERISATION OF THIN MAGNETIC Ni-Fe FILMS ON COPPER SUBSTRATES

摘要

In the present work, conditions for the Ni-Fe alloy electrodeposition on polycrystalline copper substrates from weakly acid sulphate-citrate electrolytes have been developed. Total and partial polarization curves for the deposition of nickel and iron separately as well as for their codeposition under controlled hydrodynamic conditions were determined. It has been established that Ni-Fe deposition process is mainly controlled by the mass transfer of the Fe(II) species towards the electrode. The chemical composition of such electrochemically produced films varies with their thickness, which significantly affects their physical properties. The change in coercive force of films as a function of thickness has been investigated and discussed, taking into account the influence of the chemical composition gradient of Ni-Fe alloy.