Instability of the Fine Particle Structure of Certain Electrodeposits

Abstract
The effect of cold‐working and annealing on fine particle Co–P and Co–N–P electrodeposits is described. It is shown that the rod‐type structure is sensitive to both cold‐working and annealing while the platelet structure is sensitive only to annealing. Quantitative differences in response to annealing are discussed. It is suggested that both rod and platelet particles are coated with a thin layer of nonmagnetic cobalt‐cobalt phosphide or nickel‐nickel phosphide. This nonmagnetic coating explains both the high coercivity of the samples and the effect of annealing.

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