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AssigneeInternational Business Machines Corporation
InventorsEmanuel Israel Cooper, Thomas Edward Dinan, Lubomyr Taras Romankiw, Hong Xu
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A cobalt-iron alloy film having saturation magnetization of at least about 2.30 Telsa. The film alloy includes about 55 wt % to about 75 wt. % iron and the remainder cobalt. The film is made by a process in which the film is electrodeposited from an aqueous medium which includes one or more ferrous salts, one or more cobaltous salts, a buffer having a pKa of about 6 to about 8, at least one carboxylic acid having a pKa of between about 3.5 and about 5.5, an aromatic sulfinic acid or its salt and optionally, a halide salt and/or a surfactant. The alloy film is useful as a write head in magnetic recording.
A cobalt-iron alloy film comprising an cobalt-iron alloy film having a saturation magnetization of at least about 2.30 Tesla, said film including between about 55% and about 75% iron and the remainder cobalt, said percentage being by weight based on the total weight of the alloy.
A process of making a cobalt-iron alloy film which comprises electrodepositing an alloy film from an aqueous medium which includes one or more ferrous salts, one or more cobaltous salts, an acid which is at least one mono- or polycarboxylic acid having pKa in the range of between about 3.5 and about 5.5, a buffer which is at least one buffer having a pKa of about 6 to 8 which does not co-deposit into said alloy film and an aromatic sulfinic acid or a salt thereof.
Dependencies are inferred from the claim text.