Jeffrey D Mccann

US Patent:

6689425, Feb 10, 2004

Filed:

Oct 22, 2001

Appl. No.:

09/982937

Inventors:

Xiaoding Ma - Redwood City CA
Kevin J. Grannen - Fremont CA
Jing Gui - Fremont CA
Jeffrey A. McCann - Tracy CA
Mark A. Shows - Fremont CA

Assignee:

SeagateTechnology LLC - Scotts Valley CA

International Classification:

B05D 512

US Classification:

427562, 427577, 427525, 427131

Abstract:

Ion beam-deposited, nitrogen-doped C:H films having substantially lower resistivities than undoped ion beam-deposited C:H films and suitable for use as hard, abrasion-resistant overcoat layers for magnetic recording media, such as hard disks, are formed by supplying a mixture of hydrocarbon and nitrogen gases to an ion beam generator. Nitrogen atom content of the films is controlled to within from about 5 to about 25 at. % by appropriate selection of the ratio of hydrocarbon gas flow to nitrogen gas flow. The resultant IBD i-C:HN films exhibit a reduced tendency for charge build-up thereon during hard disk operation by virtue of their lower resistivity vis-Ã-vis conventional a-C:H materials.

US Patent:

6982071, Jan 3, 2006

Filed:

Jan 14, 2004

Appl. No.:

10/756466

Inventors:

Xiaoding Ma - Redwood City CA, US
Kevin J. Grannen - Fremont CA, US
Jing Gui - Fremont CA, US
Jeffrey A. McCann - Tracy CA, US
Mark A. Shows - Fremont CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

C01B 31/06
C23C 14/48
C23C 14/24
H05H 1/46

US Classification:

423445R, 423446, 427131, 427523, 427562, 427577

Abstract:

Ion beam-deposited, nitrogen-doped C:H films having substantially lower resistivities than undoped ion beam-deposited C:H films and suitable for use as hard, abrasion-resistant overcoat layers for magnetic recording media, such as hard disks, are formed by supplying a mixture of hydrocarbon and nitrogen gases to an ion beam generator. Nitrogen atom content of the films is controlled to within from about 5 to about 25 at. % by appropriate selection of the ratio of hydrocarbon gas flow to nitrogen gas flow. The resultant IBD i-C:HN films exhibit a reduced tendency for charge build-up thereon during hard disk operation by virtue of their lower resistivity vis-à-vis conventional a-C:H materials.

US Patent:

63127989, Nov 6, 2001

Filed:

Sep 21, 1999

Appl. No.:

9/400187

Inventors:

Xiaoding Ma - Redwood City CA
Kevin J. Grannen - Fremont CA
Jing Gui - Fremont CA
Jeffrey A. McCann - Tracy CA
Mark A. Shows - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 572

US Classification:

428336

Abstract:

Ion beam-deposited, nitrogen-doped C:H films having substantially lower resistivities than undoped ion beam-deposited C:H films and suitable for use as hard, abrasion-resistant overcoat layers for magnetic recording media, such as hard disks, are formed by supplying a mixture of hydrocarbon and nitrogen gases to an ion beam generator. Nitrogen atom content of the films is controlled to within from about 5 to about 25 at. % by appropriate selection of the ratio of hydrocarbon gas flow to nitrogen gas flow. The resultant IBD i-C:HN films exhibit a reduced tendency for charge build-up thereon during hard disk operation by virtue of their lower resistivity vis-a-vis conventional a-C:H materials.