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Manufacture Of Electroplated Magnetic Films

IP.com Disclosure Number: IPCOM000098107D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Sankuer, RF: AUTHOR [+2]

Abstract

In the manufacture of electroplated magnetic films, it is found that the surface characteristics of the substrate have substantial effects upon the magnetic properties of the film. For example, nickel iron films plated upon ceramic substrates are found to have significantly better switching characteristics than identical films plated upon smooth substrates such as glass or plastic. It is believed that the irregular ceramic surfaces cause strains in the film which produce more favorable sites for domain nucleation than are found in films on smooth substrates.

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Manufacture Of Electroplated Magnetic Films

In the manufacture of electroplated magnetic films, it is found that the surface characteristics of the substrate have substantial effects upon the magnetic properties of the film. For example, nickel iron films plated upon ceramic substrates are found to have significantly better switching characteristics than identical films plated upon smooth substrates such as glass or plastic. It is believed that the irregular ceramic surfaces cause strains in the film which produce more favorable sites for domain nucleation than are found in films on smooth substrates.

The switching time of films plated on smooth substrates is somewhat improved by artificial roughening of the substrate, as by scratching or sandblasting, but these techniques do not always provide uniform results. Moreover, where the surface to be plated is a thin insulating layer covering electrical circuitry, these techniques create a danger of complete penetration of the insulation and consequent short circuiting.

It is found that uniform plating surfaces having proper surface characteristics,
i. e., controlled surface irregularity, are provided by coating any substrate with a lacquer, varnish, or other insulating coating which contains inert granular materials. Particles of the granular material create irregularities in the surface of the coating similar to the irregularities in a ceramic surface, with the same results.

To provide the best results, the granular...