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Control of the Magnetic Properties of Electrolessly Deposited Cobalt Thin Films by Phosphorus Content

IP.com Disclosure Number: IPCOM000094470D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Arcus, AA: AUTHOR [+5]

Abstract

Magnetic properties of cobalt metal electrolessly deposited from baths containing hypophosphite ion as a reducing agent are dependent over a broad range upon the phosphorus content of the plated metal. The drawing indicates that coercivity depends on the phosphorus content of the Co-P film. The coercivity increases linearly with increased weight per cent of phosphorus.

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Control of the Magnetic Properties of Electrolessly Deposited Cobalt Thin Films by Phosphorus Content

Magnetic properties of cobalt metal electrolessly deposited from baths containing hypophosphite ion as a reducing agent are dependent over a broad range upon the phosphorus content of the plated metal. The drawing indicates that coercivity depends on the phosphorus content of the Co-P film. The coercivity increases linearly with increased weight per cent of phosphorus.

The weight per cent of phosphorus in the film can be controlled either by varying the hypophosphite ion concentration or changing the bath's pH. Generally speaking, as the hypophosphite ion concentration increases the phosphorus content of the resulting film increases. Co-P films having a phosphorus content of 2% or greater have preferred magnetic properties. Also, generally speaking, increasing pH, in the basic range, increases the phosphorus content of the Co-P film. The phosphorus content of the film can also be controlled by adjusting the temperature of the bath.

In any event, coercivity is not a simple function of film thickness.

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