Seagate Technology Incorporated

Jie-Ming Yu

Kuo-Hsing Hwang

Liji Huang

Chung Yuang Shih

Kueir-Weei Chour

Paul Stephen McLeod

Chung-Yuang Shih

Shanghsien Alex Rou

Mark Anthony Shows

Alexander Boris Khazanov

Rajiv Yadav Ranjan

Charles Chengyea Leu

Qixu David Chen

Lin Huang

A magnetic recording medium is provided with a dual layer protective overcoat system comprising a SiC corrosion barrier layer and a carbon-containing protective overcoat thereon. The SiC layer effectively prevents or significantly reduces Co and Ni diffusion to the medium surface. Embodiments include magnetic recording media comprising a SiC corrosion barrier layer over a magnetic layer, an overlying protective layer of amorphous hydrogenated carbon, amorphous nitrogenated carbon or amorphous hydrogen-nitrogenated carbon, and a lubricant topcoat thereon. Embodiments of the present invention further include magnetic recording media comprising Ni&mdash;P plated aluminum, Ni-plated glass or non-conductive substrates including glass, glass-ceramic and ceramic materials. Embodiments of the present invention further include a dual protective overcoat system having a combined thickness less than about 100 &angst;, such as less than about 75 &angst;, e.g., less than about 50 &angst;, with the SiC corrosion barrier layer having a thickness ranging from 1 &angst; to 40 &angst;.

Magnetic recording media comprising a silicon carbide corrosion barrier layer and a c-overcoat

Selective deposition of a layer of a material, such as a thick protective overcoat, onto a selected substrate area, such as the inner or CSS landing zone, is achieved using a sputtering target assembly comprising a target/cathode having a planar sputtering surface including an erosion track area, a collimating shield positioned proximate the sputtering surface and surrounding at least a portion of the erosion track area, the collimating shield including an inwardly facing wall, and a blocking shield centrally positioned over the surface of the target/cathode and including an outwardly facing wall, wherein the inwardly facing wall of the collimating shield and the outwardly facing wall, wherein the inwardly facing wall of the collimating shield and the outwardly facing wall of the central blocking shield form an open-ended collimating channel for directing sputtered particles onto the selected substrate area.

Sputtering target assembly and method for depositing a thickness gradient layer with narrow transition zone

A magnetic recording medium is formed with dual carbon-containing protective layers having a combined thickness of less than about 100 &angst; with high corrosion resistance and superior magnetic performance. Embodiments of the present invention include sputter depositing a first protective layer of hydrogenated carbon at a density of at least 1.9 while applying a DC bias of about 250V to about 400V to the substrate, and sputter depositing a second protective layer comprising nitrogen-doped hydrogenated carbon on the first protective layer.

Magnetic recording medium with high density, thin dual carbon overcoats

A sputtering target assembly for depositing onto a selected substrate area comprises a target/cathode having a planar sputtering surface including an erosion track area, a collimating shield positioned proximate to the sputtering surface, surrounding at least a portion of the erosion track area, and including an inwardly facing wall, and a blocking shield centrally positioned over the surface of the target/cathode and including an outwardly facing wall, wherein the inwardly facing wall of the collimating shield and the outwardly facing wall of the central blocking shield form an open-ended channel for directing sputtered particles onto the selected substrate area. A method for utilizing the target assembly for selectively depositing a thicker protective overcoat layer on the inner CSS or landing zone relative to the outer data zone of disk-shaped recording media is provided.

Magnetic recording medium with high density thin dual carbon overcoats

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Pleasanton, CA, United States of America

Jie-Ming Yu