Abstract

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.

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