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Method of Improving the Adhesion and Controlling the Coercivity of Electrolessly Deposited Thin Films

IP.com Disclosure Number: IPCOM000094471D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Snyder, KA: AUTHOR [+2]

Abstract

In order to electrolessly deposit films of cobalt and other metals on nonconductive or noncatalytic surfaces, it is necessary to activate and sensitize the to be plated surface. Nonconductive, nonmetallic surfaces, such as plastics, are normally sensitized by a two-step process which includes activating the surface by immersing it in a SnCl(2) solution followed by sensitization in a PdCl2 solution. A conductive material, such as a noncatalytic metal, can be sensitized by merely immersing it in a PdCl2 solution.

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Method of Improving the Adhesion and Controlling the Coercivity of Electrolessly Deposited Thin Films

In order to electrolessly deposit films of cobalt and other metals on nonconductive or noncatalytic surfaces, it is necessary to activate and sensitize the to be plated surface. Nonconductive, nonmetallic surfaces, such as plastics, are normally sensitized by a two-step process which includes activating the surface by immersing it in a SnCl(2) solution followed by sensitization in a PdCl2 solution. A conductive material, such as a noncatalytic metal, can be sensitized by merely immersing it in a PdCl2 solution.

Both conductive and nonconductive, noncatalytic materials can be sensitized by the expedient of vacuum depositing a thin layer of palladium metal upon the to be plated surface. The vacuum deposited palladium can be on the order of 100 angstroms or less. Metal subsequently plated upon the vacuum deposited palladium sensitized surface adheres quite tenaciously.

Where the electrolessly deposited metal is magnetic in nature, such as cobalt, the vacuum deposited palladium sensitization also causes a significant change in the coercivity of the plated film. With the vacuum deposited palladium undercoat, the coercivity of the plated material is lower than is expected from a specific bath composition. It is thus indicated that a vacuum deposited palladium undercoat controls the coercivity of an electrolessly deposited magnetic film. Other magnetic properties of the...