David P Druist

US Patent:

7243411, Jul 17, 2007

Filed:

Jan 18, 2005

Appl. No.:

11/037405

Inventors:

David P. Druist - Santa Clara CA, US
Aron Pentek - San Jose CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

International Classification:

G11B 5/127
G11B 5/147
C23C 13/00

US Classification:

2960307, 2960312, 2960323, 2960324, 2960325, 360126, 20419234

Abstract:

A method for protecting a write head coil during write pole notching using ion mill resistant mask formed by reactive ion etching is disclosed. Ion mill shaping of the write pole is performed after depositing an ion mill-resistant material to protect the coil.

US Patent:

7536778, May 26, 2009

Filed:

Sep 5, 2007

Appl. No.:

11/899603

Inventors:

Amanda Baer - Campbell CA, US
Tsung Yuan Chen - San Jose CA, US
David Patrick Druist - San Jose CA, US
Edward Hin Pong Lee - San Jose CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

International Classification:

G11B 5/127
H04R 31/00

US Classification:

2960316, 2960308, 2960312, 2960313, 2960315, 2960318, 216 62, 216 65, 216 66, 360121, 360122, 360317, 451 5, 451 41

Abstract:

A method of fabrication is disclosed for a slider having sites for fabrication of a continuous coil having a set of front coils and a set of back coils and a center tab, where the slider includes underpass leads.

US Patent:

7729084, Jun 1, 2010

Filed:

Dec 22, 2006

Appl. No.:

11/644446

Inventors:

Daniel Wayne Bedell - Gilroy CA, US
David Patrick Druist - Santa Clara CA, US
Edward Hin Pong Lee - San Jose CA, US
Jennifer Ai-Ming Loo - Fremont CA, US
Vladimir Nikitin - Campbell CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

International Classification:

G11B 5/17

US Classification:

36012319

Abstract:

In one embodiment and method of the present invention, a coil of a write head is created by forming a P pedestal layer and a back gap layer and further forming a coil pattern consistent with the coil to be formed and insulator spacers dispersed in the coil pattern, using a non-damascene process, thereafter the coil is formed by plating using a damascene process.

US Patent:

7742258, Jun 22, 2010

Filed:

Feb 12, 2007

Appl. No.:

11/707524

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 5/127

US Classification:

36012512

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:

7882618, Feb 8, 2011

Filed:

Dec 16, 2007

Appl. No.:

11/957468

Inventors:

David P. Druist - Santa Clara CA, US
Mohamad T. Krounbi - San Jose CA, US
David J. Seagle - Morgan Hill CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands, B.V. - Amsterdam

International Classification:

G11B 5/127
H04R 31/00

US Classification:

2960316, 2960307, 2960313, 2960314, 2960315, 2960318, 216 62, 216 65, 216 66, 380121, 380122, 380317, 451 5, 451 41

Abstract:

Methods of fabricating magnetic read heads are provided which reduce the width of the scratch exposure region of a read head. During normal fabrication processes, a read head is formed with a first shield, a read element formed on the first shield, and hard bias layers formed on either side of the read element. The width of the read elements and the hard bias layers define an initial scratch exposure region. According to embodiments herein, a mask structure is formed to protect the read element and first portions of the hard bias layers proximate to the read element. A removal process is then performed to remove second portions of the hard bias layers that are not protected by the mask structure, which defines a final scratch exposure region that is smaller than the initial scratch exposure region.

US Patent:

8159866, Apr 17, 2012

Filed:

Oct 30, 2009

Appl. No.:

12/609764

Inventors:

Dmytro Apalkov - San Jose CA, US
Vladimir Nikitin - Campbell CA, US
David Druist - Santa Clara CA, US
Steven M. Watts - Mountain View CA, US

Assignee:

Grandis, Inc. - Milpitas CA

International Classification:

G11C 11/00
G11C 5/08
G11C 11/14
G11C 11/15

US Classification:

365158, 365 66, 365171, 365173

Abstract:

A method and system for providing a magnetic junction usable in a magnetic memory are described. The magnetic junction includes first and second pinned layers, first and second nonmagnetic spacer layers, and a free layer. The first pinned layer has a first pinned layer magnetic moment and is nonmagnetic layer-free. The first nonmagnetic spacer layer resides between the first pinned and free layers. The free layer resides between the first and second nonmagnetic spacer layers. The second pinned layer has a second pinned layer magnetic moment and is nonmagnetic layer-free. The second nonmagnetic spacer layer resides between the free and second pinned layers. The first and second pinned layer magnetic moments are antiferromagnetically coupled and self-pinned. The magnetic junction is configured to allow the free layer to be switched between stable magnetic states when a write current is passed through the magnetic junction.

US Patent:

8169754, May 1, 2012

Filed:

Dec 31, 2007

Appl. No.:

12/006296

Inventors:

David P. Druist - Santa Clara CA, US
David J. Seagle - Morgan Hill CA, US
Jila Tabib - Los Gatos CA, US

Assignee:

Hitachi Global Storage Technologies, Netherlands, B.V. - Amsterdam

International Classification:

G11B 5/33

US Classification:

3603242

Abstract:

A disk drive head slider for a magnetic disk drive is provided. The head slider includes a tunnel magnetic resistance device for reading data on a magnetic disk and a dedicated noncorrosive smear detector for measuring resistance wherein the resistance corresponds to a level of smear associated with the head slider.

US Patent:

8248100, Aug 21, 2012

Filed:

Apr 19, 2011

Appl. No.:

13/089605

Inventors:

Dmytro Apalkov - San Jose CA, US
David Druist - Santa Clara CA, US

Assignee:

Grandis, Inc. - Milpitas CA

International Classification:

G06F 7/38
H01L 25/00

US Classification:

326 37, 326 38, 326 41, 326 47, 326101

Abstract:

A method and system for providing a logic device are described. The logic device includes a plurality of magnetic input/channel regions, at least one magnetic sensor region, and at least one sensor coupled with the at least one magnetic sensor region. Each of the magnetic input/channel regions is magnetically biased in a first direction. The magnetic sensor region(s) are magnetically biased in a second direction different from the first direction such that at least one domain wall resides in the magnetic input/channel regions if the logic device is in a quiescent state. The sensor(s) output a signal based on a magnetic state of the magnetic sensor region(s). The input/channel regions and the magnetic sensor region(s) are configured such that the domain wall(s) may move into the magnetic sensor region(s) in response to a logic signal being provided to at least a portion of the magnetic input regions.