Western Digital (fremont), Inc.

Other

Laurence Lujun Chen

Feng Q Liu

Michael M Chen

Di (Laura) Chen

Yimin Guo

Christian Kaiser

Qunwen Leng

Yunfei Ding

Amritpal Singh Rana

Daniele Mauri

Yuankai Zheng

Shaoping Li

Ming Mao

Mahendra Pakala

Anup Roy

Prakash Mani

Jie Guo

Zhigang Bai

Zhanjie Li

Ying Hong

Dehua Han

Yu Lo

Chengtao R Yu

The battery management system 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, such that 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.

Intelligent battery management system and method for optimizing battery set to the best performance

Present invention relates to apparatus and methods for glasses-less 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 method is t 3D display, such as TV's, monitors, smart devices (iphone, ipad, . . . ), movie theaters, games, etc. The method-includes &#x201c;mimic scene method&#x201d; which is based on image depth map and &#x201c;dynamic pinhole shutter method&#x201d;.

Method of glasses-less 3D display

Present invention relates to apparatus and methods for integrating both 3D video recording and 3D movies playing back together on intelligent devices or smart devices, wherein the method of the 3D movies recording can increase the view depth beyond human eye capability and the method and apparatus of 3D movies playing back provide large tolerance to eye motion and viewer is able to avoid the suffers from side effects of vertigo, headache, and eye fatigue; wherein intelligent devices is any one of cell-phone, PDA, iPhone / smartPhone, iPad, Google Glass, pocket/tablet PC, GPS, or eBook, laptop or notebook, computer, TV or iTV, etc.

Intelligent device with both recording and playing back 3D movies and the relevant apparatus and methods

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).

Method for improving the stability, write-ability and manufacturability of magneto-resistive random access memory

A method and system provide a magnetic transducer having an air-bearing surface (ABS). The magnetic transducer includes a first shield, a read sensor, at least one soft magnetic bias structure and at least one hard bias structure. The read sensor includes a sensor layer that has at least one edge in the track width direction along the ABS. The soft magnetic bias structure(s) are adjacent to the edge(s) of the sensor layer. The soft magnetic bias structure has a first permeability. The soft bias structure(s) are between the read sensor and the hard bias structure(s). The hard bias structure(s) are adjacent to a portion of the soft bias structure(s) and have a second permeability. The first permeability is at least ten multiplied by the second permeability.

Method and system for providing a read transducer having soft and hard magnetic bias structures

A method comprises providing a magnetic element including a free layer, a pinned layer, a nonmagnetic spacer layer between the free and pinned layers, and a pinning layer adjacent the pinned layer. The free layer is biased in a first direction. The pinned layer has a first layer having a first magnetization, a second layer having a second magnetization, and a nonmagnetic layer between the first and second layer. The first magnetization is pinned parallel to a second direction substantially perpendicular to the first direction and substantially perpendicular to the ABS. The second magnetization is antiparallel to the second direction. The pinning layer is oriented along the second direction. The method further comprises providing a hard bias structure having a hard bias magnetization, initializing the hard bias magnetization along the second direction, performing at least one thermal treatment, and resetting the hard bias magnetization substantially along the first direction.

Method and system for fabricating magnetic transducers with improved pinning

A method and system provide a touchdown sensor for use in disk drive. The touchdown sensor includes a sensor layer including a plurality of magnetic layers interleaved with at least one nonmagnetic layer. The plurality of magnetic layers are magnetically coupled and single domain. Further, the sensor has a temperature coefficient of resistivity (TCR) of at least 0.15%/&#xb0; C.

Laminated touchdown sensor for hard disk drives

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.

Method and system for providing a magnetic read transducer having a bilayer magnetic seed layer

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.

Method and system for providing a read transducer having an adaptive read sensor track width

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.

A method and system for providing a magnetic transducer are disclosed. The method and system include providing a magnetic element that includes a free layer, a pinned layer, and a nonmagnetic spacer layer between the free layer and the pinned layer. The nonmagnetic spacer layer is a tunneling barrier layer. The free layer is configured to be biased in a first direction. The pinned layer has a pinned layer magnetization configured to be pinned in a second direction that is at a first angle from perpendicular to the ABS. The first angle is nonzero and different from ninety degrees. The second direction and the first direction form a second angle that is different from ninety degrees.

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.

Current perpendicular-to-plane read sensor with back shield

New method for Image reproduction and recording is based on mechanical-guiding-apparatus-free operating methods, with flexible operations (hand, robot, vehicle), with the means for positioning, processing and controlling, and having exclusive plurality of uses. The system for image reproduction and recording based on this method includes these common apparatuses: head carrier, sprayer/reader or sprayer/reader array, and computer. Additional apparatuses used in wave-based positioning methods or relative-motion-based positioning methods, include operation-unit (OU) and communication-units (CU's), or operation-module (OM) and motion-detectors (MD), or respectively. The MD and OM provide the information of positioning for computer to determines the relative position and direction of the head array on head carrier. The CU's radiate and receive signal needed for determining distance information. The OU processes and converts the received signal into distance-related data and pass to computer. The computer determines the coordinates of each head in the head array from these data, and sends it back to OU or OM. Then the OU or OM sends the color data and spraying commands to head array, and provides power for head, or sends reading commands to head array for reading color data.

Growing community of inventors

Hayward, CA, United States of America

Laurence Lujun Chen