Magnetic recording medium, production process thereof, and...

Details Magnetic recording medium, production process thereof, and... Magnetic recording medium, production process thereof, and...

2005-09-13

2005-09-13

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Composite

Of inorganic material

C427S131000, C427S130000

Reexamination Certificate

active

06942933

ABSTRACT:
A magnetic recording medium comprises a non-magnetic substrate, a non-magnetic undercoat layer, a magnetic layer, and a protective film, the layers and film being successively formed on the substrate. The non-magnetic undercoat layer has a multi-layer structure formed of at least two layers and contains a layer A formed of a material selected from a Cr—Ta based alloy, a Cr—Nb-based alloy, a Cr—Ti based alloy, a Cr—Zr-based alloy, and a Cr—Hf-based alloy, and a layer B formed of a material selected from a Co—W based alloy, a Co—W—B-based alloy, a Co—Mo based alloy, a Co—Mo—B based alloy, a Co—W—Mo based alloy, and a Co—W—Mo—B based alloy. The layers A and B are provided in this order from the non-magnetic substrate. A process for producing the medium comprises exposing the surface of the layer B to an oxygen atmosphere.

REFERENCES:
patent: 6759149 (2004-07-01), Chen et al.
patent: 2003/0124389 (2003-07-01), Yoshida et al.

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