Edward S Murdock

US Patent:

6396670, May 28, 2002

Filed:

Jul 14, 2000

Appl. No.:

09/600382

Inventors:

Edward S. Murdock - Minneapolis MN

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 539

US Classification:

360319

Abstract:

A method and apparatus for dissipating heat generated in a sensor element of a vertical magnetoresistive recording head or flux guide magnetoresistive recording head having a recess formed in the lower and/or upper magnetic shields for enhancing efficiency during reading data from a magnetic medium. Heat is dissipated through a non-magnetic metal filler layer ( ) formed in the shield recesses ( ) between an upper ( ) or lower ( ) metal shield and a sensor element ( ) comprising a magnetoresistive head structure. The metal filler ( ) must be non-magnetic, must avoid an electrical short between the sensor element and the upper ( ) or lower ( ) magnetic shield, and must be compatible with the adjacent shield in terms of adhesion thereto and the thermal expansion coefficient thereof. An insulator layer ( ) comprising an electrical insulator is formed between the sensor element ( ) and the metal filler ( ) to insure electrical insulation. The metal filler ( ) acts as a thermal path from the sensor element ( ) to the metal shields ( ).

US Patent:

6430010, Aug 6, 2002

Filed:

May 1, 2000

Appl. No.:

09/561713

Inventors:

Edward Stephens Murdock - Edina MN

Assignee:

Seagate Technology, LLC. - Scotts Valley CA

International Classification:

G11B 533

US Classification:

360319

Abstract:

A method and apparatus for reducing the amount of off-track pickup by a read/write head in a disc drive are disclosed. The read element of the head is placed in a separation zone formed between two pole pieces. The separation zone is positioned along with the read element over a current data track. Another separation zone is formed between the two pole pieces at the sides of the read element. This separation zone formed at the sides of the read element is positioned over adjacent data tracks and has a smaller width to prevent the stray magnetic flux from the adjacent tracks from reaching the read element.

US Patent:

6462919, Oct 8, 2002

Filed:

Nov 18, 1999

Appl. No.:

09/442798

Inventors:

Anthony M. Mack - Minneapolis MN
Sining Mao - Savage MN
Michael A. Seigler - Bridgeville PA
Nurul Amin - Burnsville MN
Taras G. Pokhil - Arden Hills MN
Ananth Naman - Edina MN
Jin Li - Bloomington MN
Zheng Gao - Bloomington MN
Edward S. Murdock - Edina MN
Jumna P. Ramdular - Brooklyn Park MN
Timothy Radke - Eagan MN

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5127

US Classification:

3603273

Abstract:

A spin valve sensor is disclosed that comprises a first layer of ferromagnetic material and a second layer of ferromagnetic material. A first layer of non-ferromagnetic material is positioned between the first and second layers of ferromagnetic material. A pinning layer is positioned adjacent to the first layer of ferromagnetic material such that the pinning layer is in contact with the first layer of ferromagnetic material. The spin valve includes synthetic antiferromagnetic bias means extending over passive end regions of the second layer of ferromagnetic material for producing a longitudinal bias in the passive end regions of a level sufficient to maintain the passive end regions in a single domain state. A method for forming a spin valve sensor with exchange tabs is also disclosed.

US Patent:

6477007, Nov 5, 2002

Filed:

Aug 29, 2000

Appl. No.:

09/649985

Inventors:

Alexander M. Shukh - Savage MN
Edward S. Murdock - Edina MN
Steven A. Mastain - Chanhassen MN
James K. Price - Tonka Bay MN

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5147

US Classification:

360126

Abstract:

A magnetic recording head having an air bearing surface comprises a writer having a substantially planar single piece top pole, a shared pole and a conductive coil. The top pole and shared pole are separated by a write gap region. A magnetic stud is positioned adjacent the write gap region near the air bearing surface. The magnetic stud provides a uniform magnetic flux supply to the write gap region. The magnetic stud has a variable height along the air bearing surface. An inner surface of the magnetic stud substantially conforms to an outer surface of the conductive coil. The shared pole includes a recess, and at least a portion of the conductive coil is positioned in the recess. The recess in the shared pole is filled with an insulator that substantially surrounds the portion of the conductive coil positioned in the recess. A capping layer is formed on the portion of the conductive coil positioned in the recess. The shared pole includes a common top surface comprising a top surface of the magnetic stud, a top surface of the insulator and a top surface of the capping layer.

US Patent:

6504675, Jan 7, 2003

Filed:

Jan 12, 2001

Appl. No.:

09/759706

Inventors:

Alexander M. Shukh - Savage MN
Frank Edgar Stageberg - Edina MN
Edward Stephens Murdock - Edina MN
Sharat Batra - Wexford PA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5187

US Classification:

360125

Abstract:

A writer for perpendicular recording on bilayer media with suppressed skew angle effect on the width of the recorded track is disclosed. The writer has a wide and flat trailing edge and a narrow leading edge. In a preferred embodiment, the pole has a trapezoidal cross-section. To suppress the skew effect on the width of the recorded track, the slope angle of the pole sides may be greater than the maximum skew angle in a drive.

US Patent:

6548114, Apr 15, 2003

Filed:

Jul 17, 2001

Appl. No.:

09/907219

Inventors:

Sining Mao - Savage MN
Anthony M. Mack - Minneapolis MN
Brenda A. Everitt - Minneapolis MN
Edward S. Murdock - Edina MN
Zheng Gao - Bloomington MN

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

C23C 1606

US Classification:

4272557, 427250, 427294, 427309, 3603241

Abstract:

A method of fabricating a spin valve sensor includes sequentially depositing, without breaking vacuum, a seed layer and an antiferromagnetic layer. Sequentially depositing the seed layer and the antiferromagnetic layer includes depositing a seed layer on a substrate; depositing a Mn-alloy layer of the antiferromagnetic layer directly on top of the seed layer; and depositing a buffer layer of the antiferromagnetic layer directly on top of the Mn-alloy layer. The seed layer, the Mn-alloy layer and the buffer layer are annealed. After annealing, a portion of the buffer layer is etched and a synthetic antiferromagnetic layer is deposited on top of the buffer layer. A spacer layer is deposited on top of the synthetic antiferromagnetic layer, and a free layer is deposited on top of the spacer layer.

US Patent:

6556390, Apr 29, 2003

Filed:

Apr 25, 2000

Appl. No.:

09/558253

Inventors:

Sining Mao - Savage MN
Zheng Gao - Minneapolis MN
Jian Chen - Minneapolis MN
Edward Stephens Murdock - Edina MN

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 539

US Classification:

3603241, 36032411, 36032412

Abstract:

The present invention comprises a magnetoresistive sensor including a cap layer, a free layer, a spacer layer, a pinned layer, an oxide layer, a pinning layer, a seed layer, and a substrate layer. The sensor consists of the cap layer adjacent the free layer. The free layer is adjacent to the spacer layer. The spacer layer is adjacent to the pinned layer. The pinned layer is adjacent to the oxide layer. The oxide layer is adjacent to the pinning layer. The pinning layer is adjacent to the seed layer and the seed layer is adjacent to the substrate. The present invention also comprises a method of manufacturing the magnetoresistive sensor including forming a layered structure. An electron specular scattering effect occurs at the oxide interface to achieve enhanced GMR responses while maintaining thermostability.

US Patent:

6621659, Sep 16, 2003

Filed:

Sep 18, 2000

Appl. No.:

09/664270

Inventors:

Alexander M. Shukh - Savage MN
Edward S. Murdock - Edina MN

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5147

US Classification:

360126, 360317

Abstract:

A giant magnetoresistance recording head includes a writer having a top pole, a shared pole, a conductive coil and a write gap region. The top pole includes a first top pole piece and a second top pole piece. The second top pole piece is formed at least in part over the first top pole piece and is recessed from the air bearing surface. The first top pole piece is formed over a top flat surface of the shared pole and is separated from the shared pole by the write gap region. The shared pole has a recess on the top surface. The recess is placed under the top pole and filled with a non-magnetic material. The non-magnetic recess in the shared pole defines the throat height of the writer.