Abstract
The nature of phenomena that occurs in the electrolyte during the electrochemical deposition of CoNiFe films and the mechanism leading to the difference in the relative content of elements in the electrolyte and film was clarified. This clarification was obtained with the help of a spectrophotometric study of chloride electrolytes and the electrochemical deposition of CoNiFe films at 70 °C. An experimental study of the absorption spectra and the pH values of the FeCl2, NiCl2 and CoCl2 salt solutions at concentrations of 0.005 to 1 mol/l showed the complex nature of the ion-formation balance in single-component and mixed solutions and the dependence of ion formation on acidic and alkaline additives. The deposited CoNiFe film was made from a chloride electrolyte with a component content ratio of 1:1:1 at both high (0.5 mol/l) and low (0.006 mol\l) concentrations of each component. The content of each component in the film after the electrochemical deposition of the three component solution (FeCl2, CoCl2, and NiCl2 at equal concentrations) did not correspond to the composition of the electrolyte. The mechanism for the abnormal deposition of Co, Fe, Ni occurred due to the incomplete ionization of atoms and the differences in the mobility of ions. The magnetic susceptibility of the films formed in the triple CoNiFe system was higher than that of a permalloy. Therefore, the triple system shows promise for use in magnetic field converters.
Highlights
There are a large number of publications with research results that show the widespread use of a CoNiFe ternary alloy in microelectronic products and in magnetic memory with a high packing density
Soft magnetic CoNiFe films were obtained by electrochemical deposition from a sulfate electrolyte with the addition of ammonium chloride and boric acid [4]
Lines 5–7 in Fig. 6 show that the electrolyte consisting of a mixture of CoCl2, NiCl2, and FeCl2 at a concentration of 0.0074 moll/l has the same absorption peaks as the peaks observed for each component separately, and the addition of boric acid and saccharin barely changes the spectrum
Summary
There are a large number of publications with research results that show the widespread use of a CoNiFe ternary alloy in microelectronic products and in magnetic memory with a high packing density. In [2], the authors presented the use of a sulfate electrolyte, without sulfur-containing organic additives, to manufacture thin Co65Ni12Fe23 magnetic films, with a relatively high magnetization saturation field (2.1 T), low coercive force (1.2 Oe) and high resistance (21 μOhm · cm) These films had high mechanical stresses and an insufficiently high resistance to operate at frequencies above 100 MHz. the difference in magnetic properties is associated both with the composition of a film and with the difference in the structure of a film from that of the bulk material. Soft magnetic CoNiFe films were obtained by electrochemical deposition from a sulfate electrolyte with the addition of ammonium chloride and boric acid [4]. The aim of this study is to determine the effect of ion charges in the electrolyte on the composition of the film
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