In-situ post-deposition oxidation treatment for improved...

Details In-situ post-deposition oxidation treatment for improved... In-situ post-deposition oxidation treatment for improved...

2006-07-25

2006-07-25

Chen, Bret (Department: 1762)

Coating processes

Magnetic base or coating

Magnetic coating

C427S130000, C427S131000

Reexamination Certificate

active

07081268

ABSTRACT:
A method of manufacturing a magnetic recording medium comprises sequential steps of:(a) providing an apparatus for manufacturing the medium;(b) supplying the apparatus with a substrate for the medium;(c) forming a magnetic recording layer on the substrate in a first portion of the apparatus;(d) treating the magnetic recording layer with oxygen gas in a second portion of the apparatus at a sub-atmospheric pressure and for an interval sufficient to provide the resultant medium with at least one of the following, relative to a similar medium manufactured by a similar method but wherein the oxygen treatment of step (d) is not performed:(i) a more negative nucleation field (Hn);(ii) increased remanent squareness (Sr);(iii) increased signal-to-medium noise ratio (SMNR);(iv) narrower switching field distribution (SFD); and(v) decreased thermal decay rate; and(e) forming a protective overcoat layer on the oxygen-treated magnetic recording layer in a third portion of the apparatus.

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