Tsung Wei Chen

US Patent:

6344952, Feb 5, 2002

Filed:

Aug 25, 2000

Appl. No.:

09/648169

Inventors:

Robert Glenn Biskeborn - Hollister CA
Tsung Yuan Chen - San Jose CA
Michael J. Doscher - Morgan Hill CA
Peter V. Koeppe - San Diego CA
James Devereaux Jarratt - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 533

US Classification:

360319

Abstract:

A read element for a tape drive system is disclosed. The read element generally comprises a magneto-resistive sensor electrically coupled to first and second leads and at least one electrically conductive magnetic shield proximate the magneto-resistive element. A resistor is electrically connected to the conductive magnetic shield and to one or more of the first and second leads. The resistor is disposed between the first and second leads. The resistor continuously discharges electric charge that builds up on the conductive magnetic shield. The resistor typically has a resistance that is large enough to protect against noise due electrical shorting of the conductive magnetic shield and small enough to prevent a build-up of electric charge on the shield.

US Patent:

6392840, May 21, 2002

Filed:

Dec 8, 1997

Appl. No.:

08/986491

Inventors:

Tsung Y. Chen - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 5147

US Classification:

360126, 360120

Abstract:

In accordance with the present invention, an interleaved bi-directional magnetic tape head is provided in which the read element, write element, and servo element are formed on a common substrate. Each element has a contact pad area electrically associated withit, with each contact pad area located in a plane common to all contact pad areas. That is, the contact pad areas are planarized to each other. As a result of such planarization, two gold conduction layers, required in the prior art, are reduced to one layer. Further, the total number of mask layers is two less than the prior art, with a concomitant reduction in device fabrication time. Additionally, the unit cell size is reduced by about one-third.

US Patent:

7186348, Mar 6, 2007

Filed:

Jun 30, 2004

Appl. No.:

10/882883

Inventors:

Tsung Yuan Chen - San Jose CA, US
David Patrick Druist - San Jose CA, US
Quang Le - San Jose CA, US
Kim Y. Lee - Fremont CA, US
Chun-Ming Wang - Fremont CA, US
Howard Gordon Zolla - San Jose CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

International Classification:

G11B 5/187

US Classification:

216 22, 216 39, 216 47, 216 48, 216 66, 2960307

Abstract:

A method for fabricating a magnetic head with a trapezoidal shaped pole piece tip is described. The body of the main pole piece is deposited, then one or more layers for the pole piece tip are deposited. A bed material is deposited over the pole piece tip material. A void is formed in the bed material over the area for the pole piece tip. The void is filled with an ion-milling resistant material such as alumina preferably using atomic layer deposition or atomic layer chemical vapor deposition. The excess ion-milling resistant material and the bed material are removed. The result is an ion-milling mask formed over the area for the pole piece tip. Ion milling is then used to remove the unmasked material in the pole piece tip layer and to form a beveled pole piece tip and preferably a beveled face on the main pole piece.

US Patent:

7253992, Aug 7, 2007

Filed:

Nov 4, 2004

Appl. No.:

10/981354

Inventors:

Tsung Yuan Chen - San Jose CA, US
Yimin Hsu - Sunnyvale CA, US
Yinshi Lui - Foster City CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands, B.V.

International Classification:

G11B 5/147

US Classification:

360126

Abstract:

A single-pole perpendicular magnetic recording head contains a bevel angle promotion layer that facilitates the fabrication of the bevel angle in a trapezoidal main pole. The bevel angle promotion layer is made of a non-magnetic material that is softer than the material (e. g. , AlO) that normally underlies the main pole. In one embodiment, the bevel angle promotion layer is formed between an end of the yoke and the air bearing surface (ABS), with the top surface of the bevel angle promotion layer being substantially coplanar with the top surface of the yoke. In other embodiment the bevel angle promotion layer is integrated with a leading edge taper material, which is formed of a magnetic material, to broaden the magnetic flux path between the yoke and the main pole.

US Patent:

7377024, May 27, 2008

Filed:

Mar 25, 2005

Appl. No.:

11/090456

Inventors:

Tsung Yuan Chen - San Jose CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

International Classification:

G11B 5/187
B05D 5/12

US Classification:

2960313, 2960314, 360122, 360319, 427128, 427282

Abstract:

A method of fabricating a magnetic transducer is described which uses a trailing shield throat pad to set the trailing shield throat height. The trailing shield throat pad is used as a part of the structural form over which the material for the trailing shield is formed. The trailing shield throat pad is preferably made of a material which can selectively be removed from the gap layer with a selective etching process such as reactive-ion etching (RIE). The front edge of the trailing shield throat pad is used to define a peninsula on the trailing shield and thereby the throat of the trailing shield.

US Patent:

7477481, Jan 13, 2009

Filed:

Aug 1, 2005

Appl. No.:

11/195227

Inventors:

Hung-Chin Guthrie - Saratoga CA, US
Ming Jiang - San Jose CA, US
Aron Pentek - San Jose CA, US
Sue Siyang Zhang - Saratoga CA, US
Tsung Yuan Chen - San Jose CA, US
Yinshi Liu - Foster City CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

International Classification:

G11B 5/23

US Classification:

36011903

Abstract:

A perpendicular write head for writing data onto tracks includes a main pole, a trailing shield and bilayer trailing shield gap layer between the main pole and the trailing shield and improving writing and track width control.

US Patent:

7497008, Mar 3, 2009

Filed:

Aug 24, 2005

Appl. No.:

11/211877

Inventors:

Tsung Yuan Chen - San Jose CA, US
Frederick Hayes Dill - San Jose CA, US
James Mac Freitag - Sunnyvale CA, US
Kuok San Ho - Santa Clara CA, US
Wipul Pemsiri Jayasekara - Los Gatos CA, US
Kim Y. Lee - Fremont CA, US
Mustafa Michael Pinarbasi - Morgan Hill CA, US
Ching Hwa Tsang - Sunnyvale CA, US
Patrick Rush Webb - San Jose CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

International Classification:

G11B 5/127
H04R 31/00

US Classification:

2960316, 2960313, 2960314, 2960315, 2960318, 36032411, 36032412, 3603242, 360325, 360327, 216 62, 216 65, 216 66, 451 5, 451 41

Abstract:

An embodiment of the invention is a magnetic head with overlaid lead pads that contact the top surface of the sensor between the hardbias structures and do not contact the hardbias structures which are electrically insulated from direct contact with the sensor. The lead pad contact area on the top of the sensor is defined by sidewall deposition of a conductive material to form leads pads on a photoresist prior to formation of the remainder of the leads. The conductive material for the lead pads is deposited at a shallow angle to maximize the sidewall deposition on the photoresist, then ion-milled at a high angle to remove the conductive material from the field while leaving the sidewall material. An insulation layer is deposited on the lead material at a high angle, then milled at a shallow angle to remove insulation from the sidewall.

US Patent:

7500303, Mar 10, 2009

Filed:

May 19, 2006

Appl. No.:

11/437585

Inventors:

Tsung Yuan Chen - San Jose CA, US
Kuok San Ho - Santa Clara CA, US
Mustafa Michael Pinarbasi - Morgan Hill CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

International Classification:

G11B 5/127
H04R 31/00

US Classification:

2960316, 2960313, 2960314, 2960315, 2960318, 216 22, 216 48, 360316, 3603241, 36032411, 36032412, 427127, 427128, 427129, 427131

Abstract:

A read head for a disk drive and a method of fabricating the read head with overlaid lead pads that contact the top surface of the sensor between the hardbias structures to define the electrically active region of the sensor are described. The invention deposits the GMR and lead layers before milling away the unwanted material. A photoresist mask with a hole defining the active area of the sensor is preferably patterned over a layer of DLC that is formed into a mask. A selected portion of the exposed lead material is then removed using the DLC as a mask defining the active region of the sensor. A photoresist mask pad is patterned to define the full sensor width. The excess sensor and lead material exposed around the mask is milled away. The layers for the hardbias structure are deposited.