Jianwei Liu

US Patent:

6686019, Feb 3, 2004

Filed:

Nov 13, 2001

Appl. No.:

09/986910

Inventors:

Jianwei Liu - Fremont CA
Michael Joseph Stirniman - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5725

US Classification:

428 658, 428421, 428336, 428694 TP, 428694 TF, 427130, 427131, 427553

Abstract:

A method of in situ stabilizing a composite lubricant in order to reduce or subtantially eliminate phase separation of the components of the composite lubricant, comprising sequential steps of: (a) providing a substrate including a surface; (b) applying a thin layer or film of the composite lubricant to the substrate surface, the composite lubricant comprising at least two lubricant components which are normally mutually immiscible; and (c) treating the thin layer or film of composite lubricant solely with UV radiation for an interval sufficient to reduce or substantially eliminate phase separation of the at least two normally mutually immiscible lubricant components. Embodiments of the invention include magnetic and magneto-optical (MO) media including stabilized composite lubricant layers formed in situ according to the inventive process.

US Patent:

6753060, Jun 22, 2004

Filed:

Mar 27, 2002

Appl. No.:

10/106485

Inventors:

Jianwei Liu - Fremont CA
Michael Joseph Stirniman - Fremont CA
Wen Hong Liu - San Jose CA
Jing Gui - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5725

US Classification:

428 654, 428421, 428704, 428694 TC, 428694 TF, 428336

Abstract:

A data/information storage and retrieval medium, comprising: (a) a disk-shaped substrate including at least one surface with a layer stack thereon and including at least one magnetic or magneto-optical (âMOâ) recording layer and an uppermost, protective overcoat layer comprising a carbon (C)-based material; and (b) a lubricant topcoat layer on the protective overcoat layer, the lubricant topcoat layer treated solely with UV radiation at a dosage sufficient to increase the glide yield, decrease the glide noise, and increase the number of CSS pass cycles of the medium before failure, relative to that of the same medium but with an untreated lubricant topcoat layer.

US Patent:

6753130, Jun 22, 2004

Filed:

Jan 17, 2002

Appl. No.:

10/047105

Inventors:

Jianwei Liu - Fremont CA
David Shiao-Min Kuo - Palo Alto CA
Li-Ping Wang - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G03F 700

US Classification:

430313, 430256, 430311, 430317, 430329

Abstract:

A method for patterning a carbon-containing substrate utilizing a patterned layer of a resist material as a mask and then safely removing the mask from the substrate without adversely affecting the substrate, comprising sequential steps of: (a) providing a substrate including a surface comprising carbon; (b) forming a thin metal layer on the substrate surface; (c) forming a layer of a resist material on the thin metal layer; (d) patterning the layer of resist material; (e) patterning the substrate utilizing the patterned layer of resist material as a pattern-defining mask; and (f) removing the mask utilizing the thin metal layer as a wet strippable layer or a plasma etch/ash stop layer.

US Patent:

6761974, Jul 13, 2004

Filed:

Mar 5, 2002

Appl. No.:

10/087979

Inventors:

Jianwei Liu - Fremont CA
Michael Joseph Stirniman - Fremont CA
Jing Gui - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5725

US Classification:

428421, 428694 TF, 508244, 508267, 508582, 427131

Abstract:

A data/information storage and retrieval medium, comprising: (a) a substrate including a layer stack thereon, the layer stack including a surface and at least one magnetic or magneto-optical (âMOâ) recording layer; and (b) a thin film or layer of a lubricant formed on the surface of the layer stack, comprised of a derivatized perfluoropolyether compound comprising a generally linear perfluoropolyethcr chain and at least one Hindered Amine Light Stabilizer (âHALSâ) moiety at at least one end of the chain.

US Patent:

6780233, Aug 24, 2004

Filed:

May 9, 2002

Appl. No.:

10/140980

Inventors:

Joseph Leigh - Campbell CA
Jianwei Liu - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

C09D 400

US Classification:

106311, 106285

Abstract:

A method of manufacturing patterned magnetic or magneto-optical (MO) recording media, comprising steps of: (a) providing a workpiece including a substrate for a magnetic or magneto-optical (MO) recording medium, the workpiece including at least one major surface of hydrophilic character; (b) providing a liquid composition comprising a resist or thermoplastic polymer material, adapted for substantially complete wetting of the at least one major surface of the workpiece; (c) forming a layer of the resist or thermoplastic polymer material on the at least one major surface of the workpiece, comprising applying a thin layer of the liquid composition to the at least one major surface of the workpiece; and (d) patterning the at least one major surface of the workpiece utilizing the layer of the resist or thermoplastic polymer material.

US Patent:

6846542, Jan 25, 2005

Filed:

Dec 23, 2002

Appl. No.:

10/326155

Inventors:

Jianwei Liu - Fremont CA, US
Michael Joseph Stirniman - Fremont CA, US
Jing Gui - Fremont CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5725

US Classification:

428 642, 428 658, 428421, 428694 TF, 427130, 427553

Abstract:

A method of increasing the performance of a composite lubricant material when utilized as a thin film lubricant, comprising:.

US Patent:

6849304, Feb 1, 2005

Filed:

Mar 4, 2002

Appl. No.:

10/086848

Inventors:

Jianwei Liu - Fremont CA, US
Michael Stirniman - Fremont CA, US
Dan Castro - San Jose CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5725
C08F 246

US Classification:

427493, 427508, 427521, 427131

Abstract:

Thin lubricant films are prepared on optical and magnetic substrates by applying a lubricant having at least one UV polymerizable group onto the substrate and polymerizing the lubricant by UV irradiation at elevated temperatures. Embodiments include applying a lubricant having at least two acrylate groups onto a magnetic recording disc, heating the magnetic recording disc from about 50 C. to about 150 C. and exposing the lubricant to UV radiation substantially free of wavelengths of 200 nm or less.

US Patent:

6861653, Mar 1, 2005

Filed:

Apr 11, 2003

Appl. No.:

10/411114

Inventors:

Jianwei Liu - Fremont CA, US
Michael J. Stirniman - Fremont CA, US
John S. Bujak - San Jose CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

B29D011/00

US Classification:

25045511, 2504921

Abstract:

An equipment and method for inline infrared (IR) ultraviolet (UV) irradiation of recording media is disclosed. The components of the equipment include a saddle for holding a recording medium such as a disc, a conveyor that travels the saddle through a tunnel in which one or more IR and UV lamps are positioned to direct IR and UV light on the recording media traveling through the tunnel. The efficacy of the bonding of the lubricant to the recording medium by UV light is substantially enhanced by exposing the recording medium to IR light prior to exposure to UV light.