Surface protected magnetic recording members

Details Surface protected magnetic recording members Surface protected magnetic recording members

1974-10-29

1978-11-07

Pianalto, Bernard D.

Stock material or miscellaneous articles

All metal or with adjacent metals

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

427130, 427131, 427132, 428216, 428472, 428632, 428656, 428900, 428928, H01F 1000

Patent

active

041247361

ABSTRACT:
It is known to manufacture a recording member having a substrate supporting a magnetic recording alloy on a surface and to locate a protective covering on the surface of the alloy remote from the substrate. An improved protective covering for use in this combination comprises a barrier layer located on the surface of the recording alloy and an oxide layer located on the surface of the barrier layer remote from the recording alloy. The barrier layer preferably consists of a nonmagnetic material. The oxide layer is also nonmagnetic and is sufficiently thick to protect the magnetic alloy layer against surface abrasion. The barrier layer isolates the oxide layer from the magnetic recording layer so as to preserve the character and uniformity of the magnetic recording layer as the oxide layer is created.

REFERENCES:
patent: 3460968 (1969-08-01), Bate et al.
patent: 3498837 (1970-03-01), Alstad et al.
patent: 3516860 (1970-06-01), Simmons
patent: 3719525 (1973-03-01), Patel et al.
patent: 3767369 (1973-10-01), Barlow et al.

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