Very High Coercivity Chemically Deposited Co–Ni Films

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Abstract
Films of Co–Ni, varying in composition from 30% Co to 100% Co, and ranging in thickness from 250 to 2500 Å, were prepared by chemical deposition. Small amounts of P were also included in the deposit. Their crystallographic and magnetic properties were studied as a function of composition and thickness. X‐ray diffraction revealed a hexagonal structure for the Co films, with increasing presence of a cubic phase as Ni was introduced. The hexagonal crystallites of the all‐Co films were randomly oriented, but in the Co–Ni films there was an increasing orientation of the hexagonal (002) and cubic (111) axes perpendicular to the substrate. The coercivity for a particular thickness increased as the Ni content of the films increased, reaching a peak of about 1300 Oe at 10% to 30% Ni depending on the thickness. Beyond this, the coercivity decreased rapidly to a value of 200 Oe as the Ni content of the films increased to 70%. In the Co films the coercivity decreases markedly with increasing thickness. This dependence on thickness becomes less and less pronounced as Ni is introduced, until the coercivity becomes independent of thickness in the vicinity of 20% Ni. Thereafter, the coercivity increases with increasing thickness, and this effect becomes more evident at higher Ni contents.

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