Electroless Cobalt Research Articles

The Effect of the Concentration of Hypophosphite Ion on the Magnetic Properties of Chemically Deposited Co‐P Films

Samples of electroless cobalt phosphorus films of various thickness in the region less than 3000Aå were prepared from solutions containing different concentrations of hypophosphite ion. These samples were analyzed by x‐ray fluorescence and their magnetic characteristics were studied. The per cent phosphorus in the films was found to increase approximately logarithmically as the concentration of hypophosphite was increased. The plating rate increased concomitantly. The saturation magnetic moment and the coercivity were found to depend strongly on the phosphorus content of the films. The coercivities of these films also have a strong dependence on thickness. To a large extent the interaction of these two physical properties of the film determine the magnetic properties observed.

Magnetic Properties and Corrosion Behavior of Thin Electroless Co‐P Deposits

Thin magnetic films of Co‐P were prepared in two somewhat different electroless cobalt solutions. The magnetic properties and the corrosion behavior of these films as a function of thickness was studied. The films exhibited high coercivities with a maximum of about 1000 oe at a thickness of 600Aå. The magnetic moment of these films was found to decrease on exposure to high humidity and moderate temperatures (40°–70°C); this was used as a means of studying the extent of corrosion. The extent of corrosion was found to vary as the 2/3 power of the thickness of the film.

Structure of Electroless Cobalt Films

not Available.