Kuo-Hsing H Hwang

US Patent:

6468405, Oct 22, 2002

Filed:

Jul 13, 2000

Appl. No.:

09/615317

Inventors:

Shanghsien Rou - Fremont CA
Alexander Boris Khazanov - Mountain View CA
Jie-Ming Yu - Oakland CA
Paul Stephen McLeod - Berkeley CA
Mark Anthony Shows - Austin TX
Kuo-Hsing Hwang - San Jose CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

C23C 1434

US Classification:

20429811, 20419215, 20419216, 20419223, 20429812, 20429819

Abstract:

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.

US Patent:

6565718, May 20, 2003

Filed:

Sep 6, 2001

Appl. No.:

09/946934

Inventors:

Liji Huang - San Jose CA
Jie-Ming Yu - Pleasanton CA
Kuo-Hsing Hwang - San Jose CA
Chung Shih - Cupertino CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5851

US Classification:

20419215, 20419216, 427131

Abstract:

A magnetic recording medium is formed with dual carbon-containing protective layers having a combined thickness of less than about 100 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.

US Patent:

6569294, May 27, 2003

Filed:

Jun 20, 2001

Appl. No.:

09/884482

Inventors:

Alexander Boris Khazanov - Mountain View CA
Shanghsien Rou - Fremont CA
Jie-Ming Yu - Pleasanton CA
Paul Stephen McLeod - Berkeley CA
Mark Anthony Shows - Austin TX
Kuo-Hsing Hwang - San Jose CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

C23C 1434

US Classification:

20419216, 20419212, 20419215, 20429811, 20429813

Abstract:

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.

US Patent:

6572958, Jun 3, 2003

Filed:

Jul 21, 2000

Appl. No.:

09/621530

Inventors:

Liji Huang - San Jose CA
Jie-Ming Yu - Pleasanton CA
Kuo-Hsing Hwang - San Jose CA
Chung Shih - Cupertino CA
Lin Huang - San Jose CA
Charles Leu - Fremont CA
Qixu Chen - Milpitas CA
Rajiv Yadav Ranjan - San Jose CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 572

US Classification:

428213, 428336, 428694 TP, 428694 TC, 428698, 2041925, 2041926, 427131, 42724915

Abstract:

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 NiâP 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 , such as less than about 75 , e. g. , less than about 50 , with the SiC corrosion barrier layer having a thickness ranging from 1 to 40.

US Patent:

6967061, Nov 22, 2005

Filed:

Nov 1, 2000

Appl. No.:

09/702667

Inventors:

Mariana Munteanu - Santa Clara CA, US
Kuo-Hsing Hwang - San Jose CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B005/66

US Classification:

428611, 428637, 428668, 428678, 428694 TS, 428694 TM

Abstract:

High density longitudinal magnetic recording media are formed with two magnetic layers for enhanced SMNR, high signal, low PW 50 and high resolution. The bilayer magnetic structure comprises a first magnetic layer optimized for SMNR and a second magnetic layer formed directly on the first magnetic layer and optimized for Ms. Embodiments of the present invention include first and second magnetic layers containing Co, Cr and Pt, wherein the first magnetic layer has a higher Cr content than the second magnetic layer and the second magnetic layer has a higher Co content than the first magnetic layer.

US Patent:

20040161578, Aug 19, 2004

Filed:

Feb 19, 2003

Appl. No.:

10/367754

Inventors:

Weilu Xu - San Jose CA, US
Kuo-Hsing Hwang - San Jose CA, US
Chung Shih - Cupertino CA, US

Assignee:

Seagate Technology LLC

International Classification:

B32B003/02
G11B007/24
G11B005/72

US Classification:

428/065400, 428/695000, 427/162000, 430/270110

Abstract:

A method of forming a dual-layer protective overcoat system on a surface of a workpiece, the protective overcoat system being abrasion and corrosion resistant and bondable to a lubricant topcoat, comprising sequential steps of: (a) providing a workpiece including a surface; (b) forming a first, bulk layer of a carbon (C) and hydrogen (H)-containing material on the surface of said workpiece, the bulk layer having a rough and porous upper surface; and (c) forming a second, flash layer of a carbon (C) and nitrogen (N)-containing material on the surface of the bulk layer. Embodiments include forming disk-type magnetic and/or magneto-optical (MO) recording media comprising the dual-layer protective overcoat system and a lubricant topcoat layer.

US Patent:

20070122660, May 31, 2007

Filed:

Nov 28, 2005

Appl. No.:

11/287240

Inventors:

Weilu Xu - San Jose CA, US
Li-Lien Lee - San Jose CA, US
Charles Chen - Milpitas CA, US
Shanghsien Rou - Fremont CA, US
Kuo-Hsing Hwang - San Jose CA, US

International Classification:

G11B 5/66

US Classification:

428831000

Abstract:

A thin film magnetic recording medium with enhanced signal-to-noise ratio (SNR) comprises a non-magnetic substrate having a surface; and a layer stack atop the substrate surface, comprising at least one magnetic recording layer and a plurality of layers beneath the at least one magnetic recording layer, including: a first underlayer proximal the substrate surface; a second, grain size refinement underlayer in overlying contact with the first underlayer; a third, in-plane growth orientation underlayer in overlying contact with the second underlayer; and a magnetic stabilization layer in overlying contact with the third underlayer, wherein the third underlayer comprises manganese (Mn).

US Patent:

20080213628, Sep 4, 2008

Filed:

Mar 1, 2007

Appl. No.:

11/712560

Inventors:

Abebe Hailu - San Jose CA, US
Raj Thangaraj - Fremont CA, US
Miaogen Lu - Fremont CA, US
Qixu Chen - Milpitas CA, US
Michael Z. Wu - San Jose CA, US
Mariana R. Munteanu - Santa Clara CA, US
Kuo-Hsing Hwang - San Jose CA, US

Assignee:

SEAGATE TECHNOLOGY LLC - Scotts Valley CA

International Classification:

G11B 5/66
B05D 5/12

US Classification:

428828, 427128

Abstract:

A perpendicular magnetic recording medium comprising a substrate, an underlayer, a Ta-containing seedlayer, a magnetic layer, wherein the underlayer comprises a soft magnetic material and the Ta-containing seedlayer is between the underlayer and the magnetic layer, and a process for improving corrosion resistance of the recording medium and for manufacturing the recording medium are disclosed.