Glen Adam Garfunkel - San Jose CA Wen Chien David Hsiao - San Jose CA Edward Hinpong Lee - San Jose CA Douglas Johnson Werner - Fremont CA
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 539
US Classification:
360322
Abstract:
The present invention extends the high resistance lead layers of a read head straight back into the head from each of the first and second edges of the read sensor. This lessens the length of each of the high resistance lead layers so that they do not have to be made thicker to satisfy resistance requirements. Accordingly, a lateral width of each high resistance lead portion along the ABS and a thickness thereof are chosen so as to minimize the thickness while yet satisfying the resistance requirements. Further, a method of making the first and second lead layers is provided that minimizes the thickness of the high resistance lead layers. Instead of constructing the high resistance lead layers first, the present method constructs the high resistance lead layers last so that the high resistance lead layers are not altered by subsequent processing steps.
Read Head With N-Cycle Switch For Electrostatic Discharge (Esd) Protection
Saad Doss - Gilroy CA Glen Adam Garfunkel - San Jose CA Edward Hin Pong Lee - San Jose CA Chie Ching Poon - San Jose CA Neil Leslie Robertson - Palo Alto CA Andrew Ching Tam - Saratoga CA
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 540
US Classification:
360323, 430319
Abstract:
A read head is provided with an N-cycle switch for sequentially shorting and unshorting a sense current circuit of a read head so that the read head will be protected from electrostatic discharges (ESDs) by shorting when the read head is not being tested and unshorted during tests of the read head. The shorting and unshorting switches, which are mounted on or in a slider carrying the read head, are activated by a laser beam.
Read Head With High And Low Resistance Lead Layers Wherein The High Resistance Lead Layers Are Connected To A Read Sensor And Extend Perpendicular From An Air Bearing Surface (Abs) Of The Read Head Beyond A Back Recessed Edge Of The Sensor Where The High Resistance Lead Layers Are Connected To The Low Resistance Layers
Glen Adam Garfunkel - San Jose CA Wen-Chien (David) Hsiao - San Jose CA Edward Hinpong Lee - San Jose CA Douglas Johnson Werner - Fremont CA
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 539
US Classification:
360322
Abstract:
The present invention extends the high resistance lead layers of a read head straight back into the head from each of the first and second edges of the read sensor. This lessens the length of each of the high resistance lead layers so that they do not have to be made thicker to satisfy resistance requirements. Accordingly, a lateral width of each high resistance lead portion along the ABS and a thickness thereof are chosen so as to minimize the thickness while yet satisfying the resistance requirements. Further, a method of making the first and second lead layers is provided that minimizes the thickness of the high resistance lead layers. Instead of constructing the high resistance lead layers first, the present method constructs the high resistance lead layers after defining a stripe height of the read sensor so that the lateral expanse of the high resistance lead layers is not altered by ion milling, which ion milling increases the resistance of the high resistance lead layers.
Method Of Making A Magnetic Head Assembly Having Open Yoke Write Head With Highly Defined Narrow Track Width
Thomas Young Chang - San Jose CA Glen Adam Garfunkel - San Jose CA Edward Hin Pong Lee - San Jose CA Neil Leslie Robertson - Palo Alto CA Samuel Wonder Yuan - San Carlos CA
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 5127
US Classification:
2960314, 2960313, 2960323
Abstract:
A magnetic head assembly has an open yoke type write head constructed on top of a read head so that the write head can be constructed with a very narrow track width without restraint by the requirements of the read head. The write head has first and second pole piece portions wherein the second pole piece portion has separate front and back layer portions. A coil layer is wrapped around only the first pole piece portion and the back layer portion so that the front layer portion can be constructed separately to provide a narrow track width. Further, in a preferred embodiment the front layer portion has a reduced thickness and a higher magnetic moment than the thickness and magnetic moment of the first pole piece portion and the back layer portion. Still further, in a preferred embodiment the first pole piece portion and the back layer portion are planar due to polarization of underlying layers.
Thermal Protrusion Reduction In Magnet Heads By Utilizing Heat Sink Layers
Glen Garfunkel - San Jose CA, US Moris Dovek - San Jose CA, US Devendra Chhabra - San Jose CA, US
Assignee:
Headway Technologies, Inc. - Milpitas CA
International Classification:
G11B005/147 G11B015/64 G11B017/32
US Classification:
3602343, 360128, 360126
Abstract:
A magnetic read/write head and slider assembly and method for forming the magnetic read/write head and slider assembly, wherein the assembly has improved heat spreading and dissipation properties and exhibits significantly reduced thermal protrusion during operation. The method consists of the formation of a heat sink layer on a portion of either the upper pole yoke or the lower magnetic pole of the writer.
Method Of Manufacturing A Magnetic Read/Write Head And Slider Assembly
Devendra S. Chhabra - San Jose CA, US Rod Lee - San Jose CA, US Glen Garfunkel - San Jose CA, US Moris Dovek - San Jose CA, US
Assignee:
Headway Technologies, Inc. - Milpitas CA
International Classification:
G11B005/127
US Classification:
2960307, 2960304, 2960306, 3602345, 3602365
Abstract:
A method of fabricating a magnetic read/write head and slider assembly, wherein the assembly has improved heat spreading and dissipation properties and the read/write head exhibits significantly reduced thermal protrusion during operation. The method of fabrication is simple and efficient, involving only the extension of at least one of the conductive mounting pads so that it is in thermal contact with a portion of the slider surface that is directly above the read/write element.
Thermal Protrusion Reduction In Magnet Heads By Utilizing A Heat-Spreading Pad
Devendra S. Chhabra - San Jose CA, US Rod Lee - San Jose CA, US Glen Garfunkel - San Jose CA, US Mor Dovek - San Jose CA, US
Assignee:
Headway Technologies, Inc. - Milpitas CA
International Classification:
G11B 5/60
US Classification:
3602345
Abstract:
A magnetic read/write head and slider assembly and method for forming said magnetic read/write head and slider assembly, wherein said assembly has improved heat spreading and dissipation properties and exhibits significantly reduced thermal protrusion during operation. The method of formation is simple and efficient, involving only the extension of one of the conductive mounting pads so that it is in thermal contact with a portion of the slider assembly surface that is over the read/write element.
Bias Point Adjustment Of A Read Head By Means Of An External Magnet
Reader asymmetry control has become an important issue as track widths continue to shrink. This has been achieved by providing adaptive adjustment to the asymmetry of individual heads in the form of an additional permanent hard magnet, which may be internal or external to the head. This special ‘tuning’ magnet biases the shields and the sensor to achieve suitable asymmetry and/or amplification. Head bias adjustments may be done individually or in batch. Both the internal and the external magnet versions are described.