Laurence Shea Chen

US Patent:

8077435, Dec 13, 2011

Filed:

Nov 20, 2008

Appl. No.:

12/275125

Inventors:

Feng Liu - San Ramon CA, US
Shaoping Li - San Ramon CA, US
Laurence L. Chen - Fremont CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 5/33

US Classification:

360319, 36012312, 36032722

Abstract:

Disclosed is a read head for reading data from a magnetic media. The read head includes a bottom magnetic shield layer, a top magnetic shield layer, and a read sensor disposed between the bottom and top magnetic shield layers. The read sensor is configured for sensing changes in a magnetic field of the magnetic media positioned under the read sensor. The read sensor has a front end adjacent to an air bearing surface (ABS) and a back end opposite the front end. The read head also includes a back magnetic shield layer positioned between the bottom and top magnetic shield layers and behind the back end of the read sensor distal to the ABS.

US Patent:

8227023, Jul 24, 2012

Filed:

May 27, 2009

Appl. No.:

12/472965

Inventors:

Feng Liu - San Ramon CA, US
Prakash Mani - Fremont CA, US
Christian Kaiser - San Jose CA, US
Laurence L. Chen - Fremont CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 5/127

US Classification:

427127, 3603241

Abstract:

A method and system for providing a magnetic transducer are disclosed. The method and system include providing a magnetic element including a free layer, a nonmagnetic spacer layer, a pinned layer, and a pinning layer adjacent to the pinned layer. The free layer is to be biased in a first direction. The pinning layer biases the pinned layer magnetization in a second direction. The pinning layer is oriented along the second direction. A hard bias structure is adjacent to the magnetic element. The hard bias structure magnetization is initialized such that it has a nonzero component along the second direction. The method and system also include performing thermal treatment(s) after initializing the hard bias magnetization. The thermal treatment(s) are above room temperature. The method and system further include resetting the hard bias magnetization substantially along the first direction after the thermal process(es) are performed.

US Patent:

8422176, Apr 16, 2013

Filed:

Nov 15, 2011

Appl. No.:

13/297204

Inventors:

Qunwen Leng - Palo Alto CA, US
Laurence L. Chen - Hayward CA, US
Yimin Guo - San Jose CA, US
Yuankai Zheng - Fremont CA, US
Mahendra Pakala - Fremont CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 5/39

US Classification:

360313

Abstract:

A method and system for providing a magnetic read transducer is described. The magnetic read transducer includes a bilayer magnetic seed layer, an antiferromagnetic (AFM) layer, and a read sensor. The bilayer magnetic seed layer includes a NiFelayer and a NiFelayer on the NiFelayer, where x is at least 0. 3 and not more than 1 and where y is not more than 0. 19. The AFM layer resides on the bilayer magnetic seed layer. The read sensor is on the AFM layer.

US Patent:

8599520, Dec 3, 2013

Filed:

Dec 20, 2011

Appl. No.:

13/332275

Inventors:

Feng Liu - San Ramon CA, US
Laurence L. Chen - Hayward CA, US
Yimin Guo - San Jose CA, US
Amritpal S. Rana - Union City CA, US
Shaoping Li - San Ramon CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 5/127
G11B 5/39

US Classification:

3603241, 360122

Abstract:

A method and system provide a magnetic read transducer having an air-bearing surface (ABS). The magnetic transducer includes a first shield, a second shield, and a read sensor between the first shield and the second shield. The read sensor extends along a stripe height direction perpendicular to the ABS. A first portion of the read sensor at the ABS has a first width in a track width direction parallel to the ABS. A second portion of the read sensor is recessed from the ABS along the stripe height direction and has a second width in the track width direction. The second width is greater than the first width.

US Patent:

8638529, Jan 28, 2014

Filed:

Apr 1, 2013

Appl. No.:

13/854828

Inventors:

Laurence L. Chen - Hayward CA, US
Yimin Guo - San Jose CA, US
Yuankai Zheng - Fremont CA, US
Mahendra Pakala - Fremont CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 5/39

US Classification:

360313, 427131

Abstract:

A method and system for providing a magnetic read transducer is described. The magnetic read transducer includes a bilayer magnetic seed layer, an antiferromagnetic (AFM) layer, and a read sensor. The bilayer magnetic seed layer includes a NiFelayer and a NiFelayer on the NiFelayer, where x is at least 0. 3 and not more than 1 and where y is not more than 0. 19. The AFM layer resides on the bilayer magnetic seed layer. The read sensor is on the AFM layer.

US Patent:

20150063011, Mar 5, 2015

Filed:

Sep 3, 2013

Appl. No.:

13/987786

Inventors:

Laurence Lujun Chen - Hayward CA, US
Di (Laura) Chen - Xi'an, CN
Michael Meng Chen - Hayward CA, US

International Classification:

G11C 11/16

US Classification:

365158

Abstract:

This invention provides the method to overcome 4 backwards which limit the manufacturability or production yield rate of Magneto-resistive random access memory (MRAM). The key points of this invention are: (1) providing method to improve the manufacturability through reducing bias variation, by using a compensation module to correct the bias point of extreme cells; (2) providing method to improve the manufacturability through removing outlier cells (called bad cells), by using “writing jump-over” and “reading exclusion” to exclude bad-cells; (3) providing method to reduce the bias point, amplitude and asymmetry variation, using shared fixed-magnetic-reference-layer and proper shape anisotropy; (4) providing method to improve the write-ability, using flipping-assistant-field to speed up STT flipping process by large current, and using heating resistance and heating cells by the same current (including global heating, row heating, column heating, or local cell heating, i.e. heating with conventional thermal nature or heating with thermagnonic spin-transfer torque).

US Patent:

20150054927, Feb 26, 2015

Filed:

Aug 23, 2013

Appl. No.:

13/987705

Inventors:

Laurence Luju Chen - Hayward CA, US
Di (Laura) Chen - Xi'an, CN
Jie Guo - Hanyin, CN
Michael Meng Chen - Hayward CA, US

International Classification:

H04N 13/04

US Classification:

348 56

Abstract:

Present invention relates to apparatus and methods for glassless 3D display with “unlimited” number of TV viewers and with flexibility for eye positions, the fundament elements of this invention are the introduction of “eye space” and the circuit unit for shutter pupil control on shutter screen. The methods are applied to any 3D display, such as TV's, monitors, smart devices (iphone, ipad, . . . ), movie theaters, games, etc. One of the methods is called “mimic scene method”, based on image depth map. The second one is called “dynamic pinhole shutter method”.

US Patent:

20140356656, Dec 4, 2014

Filed:

May 31, 2013

Appl. No.:

13/844978

Inventors:

Laurence Lujun Chen - Hayward CA, US
Di (Laura) Chen - Xi'an, CN
Michael Meng Chen - Hayward CA, US

International Classification:

H02J 7/00
H01M 10/63
H01M 10/617
H01M 10/42

US Classification:

429 62, 320134

Abstract:

This innovation is related to intelligent battery management system and method for optimizing the battery set to the best performance. The management system is supported by a cutting-edge method and corresponding embodiment, which can automatically re-combine batteries in a battery set in parallel connection or in series connection or in mixed series-parallel connection, or mixed parallel-series connection, and makes each individual cell in a battery being accessible, which means each individual cell can be monitored (i.e. its parameters can be measured) and charged or discharged. Therefore, with this system, batteries can be charged or discharged to their best performance.