Abstract
CoPt films, 10-16 μm thick, of near-equiatomic composition were deposited from sodium citrate electrolyte containing [Pt(NΟ 2 ) 2 (NH 3 ) 2 ] 0 complex and CoSO 4 as the source of the Pt and Co, respectively. The effect of the total ammonia (NH + 4 + NH 3 ) and citrate concentrations on the deposition current efficiency and alloy composition was determined. Annealing of films with 42-48 atom % Pt resulted in a dramatic increase of their coercivity and squareness. The annealed films consisted of A 1 (face-centered cubic) and Llo (face-centered tetragonal) phases. The presence of an additional CoO phase in the films contributed to an increase of their coercivity.
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