Hai Jiang from San Mateo, CA, age 58

Us Patents

Perpendicular Recording Write Head Having A Recessed Magnetic Adjunct Pole And Method Of Making The Same
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US Patent:

6791793, Sep 14, 2004
Filed:

Sep 14, 2001
Appl. No.:

09/952989
Inventors:

Yingjian Chen - Fremont CA
Xiaozhong Dang - Fremont CA
Francis H. Liu - Fremont CA
Kroum Stoev - Fremont CA
Hai Jiang - Fremont CA
Yugang Wang - Milpitas CA
Xizeng Shi - Fremont CA
Assignee:

Western Digital (Fremont), Inc. - Fremont CA
International Classification:

G11B 5147
US Classification:

360126
Abstract:

A read/write head and method of making the same, are used in a data storage system, such as a disk drive, for perpendicular magnetic recording of data. The head employs a two-layer pole design with a main pole made of sputtered high moment magnetic material, and an adjunct pole made of electroplated soft magnetic film. The adjunct pole is substantially recessed from the air bearing surface. The present head design significantly enhances the magnetic write field, and substantially reduces side-writing that result in accidental erasure of data in adjacent tracks on the magnetic recording medium.

Write Head Having A Recessed, Magnetic Adjunct Pole Formed Atop A Main Pole, And Method Of Making The Same
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US Patent:

6906894, Jun 14, 2005
Filed:

Jul 29, 2004
Appl. No.:

10/903977
Inventors:

Yingjian Chen - Fremont CA, US
Xiaozhong Dang - Fremont CA, US
Francis H. Liu - Fremont CA, US
Kroum Stoev - Fremont CA, US
Hai Jiang - Fremont CA, US
Yugang Wang - Milpitas CA, US
Xizeng Shi - Fremont CA, US
Assignee:

Western Digital (Fremont), Inc. - Fremont CA
International Classification:

G11B005/147
G11B005/127
US Classification:

360126, 360123, 360125, 360317, 2960308, 2960314
Abstract:

A read/write head and method of making the same are used in a data storage system, such as a disk drive, for perpendicular magnetic recording of data. The head employs a two-layer pole design with a main pole made of sputtered high moment magnetic material, and an adjunct pole made of electroplated soft magnetic film. The main pole is used to write data onto the medium, and is formed over the write coil. The adjunct pole is substantially recessed from the air bearing surface and is formed over the main pole. The present head design significantly enhances the magnetic write field, and substantially reduces side-writing that result in accidental erasure of data in adjacent tracks on the magnetic recording medium.

Coil Inductive Writer Having A Low Inductance And Short Yoke Length
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US Patent:

6940688, Sep 6, 2005
Filed:

Oct 21, 2002
Appl. No.:

10/277463
Inventors:

Hai Jiang - Fremont CA, US
Yingjian Chen - Fremont CA, US
Xiaozhong Dang - Fremont CA, US
James Wang - Milpitas CA, US
Assignee:

Western Digital (Fremont), Inc. - Fremont CA
International Classification:

G11B005/147
US Classification:

360123
Abstract:

A method and system for providing a thin film recording head are disclosed. The method and system include providing a first pole, providing a second pole and providing a write gap separating the first pole from the second pole. The method and system further include providing at least one coil having a plurality of turns. A portion of each of the plurality of turns is between the first and the second pole. The plurality of turns wind around the second pole.

Magnetically Soft, High Saturation Magnetization Laminates Of Iron-Cobalt-Nitrogen And Iron-Nickel For Magnetic Head Pole Layers
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US Patent:

7177117, Feb 13, 2007
Filed:

May 24, 2004
Appl. No.:

10/853416
Inventors:

Hai Jiang - Fremont CA, US
Kyusik Sin - Pleasanton CA, US
Yingjian Chen - Fremont CA, US
Assignee:

Western Digital (Fremont), Inc. - Fremont CA
International Classification:

G11B 5/147
US Classification:

360126, 428611
Abstract:

A magnetic head comprising a first layer containing NiFe having a concentration of iron that is at least thirty percent and not more than seventy percent; a second layer that adjoins the first layer and contains FeCoN having a concentration of iron that is greater than the second layer's concentration of cobalt, having a concentration of nitrogen that is less than the second layer's concentration of cobalt and less than three percent; and a third layer containing FeCoNi having a concentration of nickel that is less than eight percent, having a concentration of cobalt that is less than the third layer's concentration of iron and greater than the third layer's concentration of nickel, the third layer adjoining only one of the first and second layers. The first and second layers may be repeated to form a magnetically soft high Blaminate for a pole layer.

Magnetically Soft, High Saturation Magnetization Laminate Of Iron-Cobalt-Nitrogen And Iron-Nickel For Perpendicular Media Underlayers
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US Patent:

7354664, Apr 8, 2008
Filed:

May 25, 2004
Appl. No.:

10/854119
Inventors:

Hai Jiang - Fremont CA, US
Kyusik Sin - Pleasanton CA, US
Yingjian Chen - Fremont CA, US
Assignee:

Western Digital (Fremont), LLC - Fremont CA
International Classification:

G11B 5/66
US Classification:

428829, 428827, 428831
Abstract:

A magnetic disk has a soft magnetic underlayer comprising a first layer containing NiFe having a concentration of iron that is at least thirty percent and not more than seventy percent; a second layer that adjoins the first layer and contains FeCoN having a concentration of iron that is greater than the second layer's concentration of cobalt, having a concentration of nitrogen that is less than the second layer's concentration of cobalt and less than three percent; and a third layer containing FeCoNi having a concentration of nickel that is less than eight percent, having a concentration of cobalt that is less than the third layer's concentration of iron and greater than the third layer's concentration of nickel, the third layer adjoining only one of the first and second layers. The first and second layers may be repeated to form a magnetically soft high Blaminate for a disk underlayer.

Magnetic Recording Head With Resistive Heating Element And Thermal Barrier Layer
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US Patent:

7428124, Sep 23, 2008
Filed:

Feb 9, 2006
Appl. No.:

11/350993
Inventors:

Suping Song - Fremont CA, US
Hai Jiang - Fremont CA, US
Charles W. Miller - San Jose CA, US
Kroum Stoev - Pleasanton CA, US
Assignee:

Western Digital (Fremont), LLC - Fremont CA
International Classification:

G11B 5/147
US Classification:

360128, 36012574, 36012575
Abstract:

A thin film magnetic head includes a slider body having a trailing surface meeting an air-bearing surface at a trailing edge. A magnetic read and write elements are disposed along the trailing surface near the trailing edge. The magnetic write element includes write poles and a coil. A portion of a heating element is disposed in a first general plane beneath the coil and above the magnetic read element. At least one thermally-insulating layer of material having a thermal conductivity of less than about 2. 0 W/m-K extends in a second general plane substantially beneath the heating element.

Magnetic Write Head With High Moment Magnetic Thin Film Formed Over Seed Layer
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US Patent:

7522377, Apr 21, 2009
Filed:

Dec 10, 2004
Appl. No.:

11/009753
Inventors:

Hai Jiang - Fremont CA, US
Kyusik Sin - Pleasanton CA, US
Yingjian Chen - Fremont CA, US
Assignee:

Western Digital (Fremont), LLC - Fremont CA
International Classification:

G11B 5/147
US Classification:

36012512, 36012526, 3601255, 36012563, 428816
Abstract:

A magnetic write head includes a seed layer and a magnetic layer on the seed layer. The seed layer includes seed-layer grains having either a face-centered cubic (fcc) crystalline structure with a surface plane substantially oriented in a [111] direction or a hexagonal-close-packed (hcp) crystalline structure with a surface plane substantially oriented in a [0001] direction. The magnetic layer includes magnetic-layer grains having a body-centered-cubic (bcc) crystalline structure with a surface plane substantially oriented in a [110] direction.

Method And System For Providing A Magnetic Element Having A Current Confined Layer
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US Patent:

7672086, Mar 2, 2010
Filed:

Apr 28, 2004
Appl. No.:

10/833460
Inventors:

Hai Jiang - Fremont CA, US
Assignee:

Western Digital (Fremont), LLC - Fremont CA
International Classification:

G11B 5/127
US Classification:

3603241
Abstract:

A method and system for providing a current confined magnetic element is disclosed. The method and system include providing a pinned layer, providing a nonmagnetic spacer layer, and providing a free layer. The nonmagnetic spacer layer resides between the pinned layer and the free layer. The method and system also include sputtering a current confinement layer. The current confinement layer includes an insulator and a conductor that are immiscible. The conductor forms a plurality of nano-dots in an insulating matrix. At least a portion of the plurality of nano-dots extends through the current confinement layer.