Declan N Macken

6597545, Jul 22, 2003

May 24, 2001

09/912654

Declan Macken - Prior Lake MN
Alan B. Johnston - Derry, IE
Harry S. Edelman - Minneapolis MN

Seagate Technology LLC - Scotts Valley CA

G11B 539

360319

A magnetic sensor includes a magnetoresistive sensor element and electrical contacts coupled to the magnetoresistive element configured to sense a response of the magnetoresistive element to a magnetic field. A magnetic shield is positioned adjacent the magnetoresistive element and configured to shield the magnetoresistive element from stray magnetic fields. The shield has a substantially stable magnetic domain pattern. A shield flux thief is positioned generally in a plane of the shield and spaced apart from the shield by a gap.

6754050, Jun 22, 2004

Dec 18, 2002

10/322888

Vee Sochivy Kong - Richfield MN
Declan Macken - Prior Lake MN
Huy Xuan Pham - Plymouth MN
Ladislav Rudolf Pust - Savage MN

Seagate Technology LLC - Scotts Valley CA

G11B 539

360317

A data transducer having an air bearing surface is used to reduce thermal pole tip protrusion. The data transducer includes a write via and a top pole having one end adjacent the air bearing surface and an opposite end contacting the write via. The yoke extends from the write via in two directions towards the air bearing surface and is recessed from the air bearing surface. The yoke has a first end and a second end. The data transducer includes a shared pole adjacent the air bearing surface and co-planar to the yoke wherein a gap is located between the shared pole and the yoke. A shared pole extension extends between the shared pole and the first and second ends of the yoke.

6781801, Aug 24, 2004

Jan 22, 2002

10/054130

Olle Gunnar Heinonen - Eden Prairie MN
Declan Macken - Prior Lake MN

Seagate Technology LLC - Scotts Valley CA

G11B 539

3603242, 3603241

A tunneling magnetoresistive (TMR) stack configured to operate in a current-perpendicular-to-plane (CPP) mode has a plurality of layers including a spin valve and a barrier layer. The spin valve is used to inject a spin polarized sense current into the barrier layer for increasing a magnetoresistive (MR) ratio of the TMR stack.

6791796, Sep 14, 2004

Sep 27, 2002

10/259133

Alexander Mikhailovich Shukh - Savage MN
Vladyslav Alexandrovich Va ko - Minneapolis MN
Declan Macken - Prior Lake MN

Seagate Technology LLC - Scotts Valley CA

G11B 531

360126, 360125

The present invention is a perpendicular writer having an air-bearing surface, a main pole with an extension, and return pole, and a back gap closure intermediate the main pole extension and the return pole. The main pole includes a top magnetic layer and a soft magnetic underlayer separated by a nonmagnetic spacer. The main pole extension is in direct contact with the main pole and recessed from the air-bearing surface. The top magnetic layer forms a trailing edge of the main pole at the ABS and has a magnetic moment greater than that of the soft magnetic underlayer. Further, the top magnetic layer and the soft magnetic underlayer are antiferromagnetically coupled through the thin nonmagnetic spacer. The nonmagnetic spacer has predominantly 111-crystalline texture and promotes reduction of coercivity and grain size along with an increase of anistropy of the top magnetic layer material.

6807031, Oct 19, 2004

Jul 3, 2002

10/190182

Declan Macken - Prior Lake MN
Gavin Brinkley - Killea, IE
Taras Grigoryevich Pokhil - Arden Hills MN
Alexandar Mikhailovich Shukh - Savage MN
Martin Louis Plumer - Bloomington MN

Seagate Technology LLC - Scotts Valley CA

G11B 539

360317, 360126

A transducing head includes at least three magnetic layers. At least two of these magnetic layers function as shields of a reader portion of the transducing head, and at least one of these magnetic layers functions as a pole of a writer portion of the transducing head. Importantly, at least one of the three magnetic layers is formed of a thin film structure having a first and a second ferromagnetic layer, a nonmagnetic spacer layer, and a bias layer. The spacer layer is positioned between the first and the second ferromagnetic layers. The bias layer is positioned adjacent the first ferromagnetic layer. The second ferromagnetic layer has a thickness-magnetic moment product substantially equal to a thickness-magnetic moment product of the first ferromagnetic layer. An easy axis of the second ferromagnetic layer is substantially parallel to an easy axis of the first ferromagnetic layer.

6813118, Nov 2, 2004

Oct 22, 2002

10/277878

Ladislav Rudolf Pust - Savage MN
Declan Macken - Prior Lake MN
Tracy C. Baresh - Luck WI
Ibro Tabakovic - Edina MN
Venkateswara R. Inturi - Shakopee MN

Seagate Technology LLC - Scotts Valley CA

G11B 560

3602345, 360110

A transducing head formed upon a slider has a transducer, an electrical contact layer, a stud electrically connected to the contact layer, and a bond pad electrically connected to the stud. The electrical contact layer is electrically connected to the transducer. The stud is formed of a material having a coefficient of thermal expansion less than about 1. 3 times a coefficient of thermal expansion of a slider material forming the slider. The bond pad has a metallic underlayer and a top layer. The metallic underlayer is formed of a material having a coefficient of thermal expansion less than about 1. 1 times the coefficient of thermal expansion of the slider material.

6836389, Dec 28, 2004

Mar 7, 2003

10/383298

Declan Macken - Prior Lake MN
John Robert Pendray - Edina MN
Vee Sochivy Kong - Richfield MN
Mallika Kamarajugadda - Edina MN
Jeremy Adam Thurn - Eagan MN

Seagate Technology LLC - Scotts Valley CA

G11B 560

3602351

A magnetic head slider having an air bearing surface is used for reading and writing data from a magnetic medium. The magnetic head includes a substrate having a disc opposing face bounded by a leading face, a trailing face, and first and second sided edges. The slider includes an end layer positioned upon the trailing face of the substrate wherein the basecoat has a disc opposing face and is comprised of a material having a coefficient of thermal expansion greater than a coefficient of thermal expansion of the substrate. An air bearing pad is formed solely on the disc opposing face of the end layer. A transducing head is formed in the air bearing pad and exposed at an air bearing surface.

6876526, Apr 5, 2005

Sep 11, 2002

10/241431

Declan Macken - Prior Lake MN, US
Christopher John Cote - Eden Prairie MN, US
Ladislav Rudolf Pust - Savage MN, US
Vee Sochivy Kong - Richfield MN, US

Seagate Technology LLC - Scotts Valley CA

G11B005/127
G11B005/33

36032412, 360126

A transducing head formed upon a slider has an air bearing surface, a top magnetic pole, a shared magnetic pole, a write via, and a shared pole extension. The write via is positioned opposite the air bearing surface and extends between the top magnetic pole and the shared magnetic pole. The shared pole extension is positioned adjacent the air bearing surface and extends from the shared magnetic pole toward the top magnetic pole. The shared pole extension is separated from the top magnetic pole by a write gap. The shared pole extension is formed of a multilayer having a layer of a first material having a high magnetic moment and a layer a second material having a coefficient of thermal expansion substantially similar to a coefficient of thermal expansion of the slider material.