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Browse Prior Art Database

Chemically Plated Cobalt with Temperature Independent Coercivity

IP.com Disclosure Number: IPCOM000092520D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Judge, JS: AUTHOR [+3]

Abstract

Cobalt-phosphorus magnetic films 1000 angstroms thick are produced by chemical reduction from the following solution: CoSO(4) 0.0855 M Na(3) Citrate 0.183 M (NH(4))(2)H Citrate 0.088 M (NH(4))(2)SO(4) 0.307 M NaH(2)PO(2) x H(2)O 0.170 M pH = 8.3 at 85 degrees C (adjusted with NH(4)OH) Temperature 85 degrees C.

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Chemically Plated Cobalt with Temperature Independent Coercivity

Cobalt-phosphorus magnetic films 1000 angstroms thick are produced by chemical reduction from the following solution: CoSO(4) 0.0855 M

Na(3) Citrate 0.183 M

(NH(4))(2)H Citrate 0.088 M

(NH(4))(2)SO(4) 0.307 M

NaH(2)PO(2) x H(2)O 0.170 M

pH = 8.3 at 85 degrees C (adjusted with

NH(4)OH)

Temperature 85 degrees C.

The resulting alloy film contains 96.2% Co and 3.8% P. Crystallographically, the film is composed of hexagonal crystallites of cobalt with a crystallite size in the range of about 200 to about 1,000 angstroms and with a slight degree of orientation of the c-axis in the plane of the film. The coercivity of the film is on the order of 1100 oersteds and varies by only about 4% over a temperature range of several hundred degrees.

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