Title: Magnetic recording element

Abstract: A magnetic recording element made in accordance with the present invention comprises a layer of magnetic material applied to a carrier formed from a material of high magnetic permeability. A layer of non-ferrous, non-magnetic material is interposed between the carrier and the layer of magnetic material. The layer of non-magnetic material has a thickness between 20 and 40 microns. The magnetic recording element enables sharply defined magnetized domains to be obtained and is in a simple and repeatable fashion, by using a process in which the materials applied to the carrier of the element undergo no chemical transformation. To this end, the non-magnetic layer is produced by successively depositing, on the carrier which is used as a cathode, a first layer of copper obtained from an alkaline electrolytic solution, and then a second layer of copper which is obtained from an acid electrolytic solution.

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Inventors: Morizot, Henri (Belfort, FR)
Lucan, Andre (Belfort, FR)

Application Number: 934849
Filing Date: 1978-08-18
Publication_date: 1980-05-27
Assignee: Compagnie Internationale pour l'Informatique (Paris, FR)
Primary Class(es): 428/676 360/136, 428/928
Other Classes:
US Patent Ref:

2999766	Sep, 1961	Ashworth	360/136.
3450517	Aug, 1969	Feldtkeller et al.	428/675.
3471272	Oct, 1969	Wilhelm et al.	428/928.
3702239	Nov, 1972	Nagy et al.	340/174.
3715793	Feb, 1973	Kefalas et al.	428/928.
3756788	Sep, 1973	Whetstone	428/675.
3853717	Dec, 1974	Diguilio	340/174.
3866192	Feb, 1975	Ulmer	428/675.
3886052	May, 1975	Smith	204/33.

Other Refs: 2601916

Jul, 1976	DE

Primary Examiner: Rutledge, L. Dewayne
Assistant Examiner: Skiff, Peter K.
Attorney: Kerkam, Stowell, Kondracki & Clarke