Magnetic recording element

Details Magnetic recording element Magnetic recording element

1978-08-18

1980-05-27

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

360136, 428928, B32B 1500, G11B 500

Patent

active

042051207

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.

REFERENCES:
patent: 2999766 (1961-09-01), Ashworth
patent: 3450517 (1969-08-01), Feldtkeller et al.
patent: 3471272 (1969-10-01), Wilhelm et al.
patent: 3702239 (1972-11-01), Nagy et al.
patent: 3715793 (1973-02-01), Kefalas et al.
patent: 3756788 (1973-09-01), Whetstone
patent: 3853717 (1974-12-01), Diguilio
patent: 3866192 (1975-02-01), Ulmer
patent: 3886052 (1975-05-01), Smith

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