Jeffrey C Carr

US Patent:

6607923, Aug 19, 2003

Filed:

Mar 4, 1998

Appl. No.:

09/034457

Inventors:

Jeffrey William Carr - Morgan Hill CA
Moris Musa Dovek - San Carlos CA
Mohamad Towfik Krounbi - San Jose CA

Assignee:

Hitachi Global Technologies - Amsterdam

International Classification:

H01L 2100

US Classification:

438 3, 438128, 438131

Abstract:

A magnetoresistive read/inductive write magnetic head assembly formed on a hard electrically insulating substrate and having electrostatic discharge protection comprises: a hard electrically insulating substrate, preferably formed of sapphire or alumina-TiC; multiple alumina layers formed over the substrate; a magnetoresistive read/inductive write head positioned between the alumina layers; a silicon layer supported by the substrate; and a semiconducting circuit integrated into the silicon layer and interconnected with said magnetoresistive read/write inductive write head to provide electrostatic discharge protection to the head. The silicon layer may be epitaxially grown on the substrate when implemented as sapphire, or bonded to the substrate when implemented as alumina-TiC. The hard electrically insulating substrate and alumina layers provide the assembly with a hard air bearing surface having generally uniform lapping and etching characteristics, and excellent durability.

US Patent:

56172737, Apr 1, 1997

Filed:

Jun 7, 1995

Appl. No.:

8/481574

Inventors:

Jeffrey W. Carr - Morgan Hill CA
Jeffrey P. Gunder - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 5127
G11B 533
G11B 560
G11B 1732

US Classification:

360105

Abstract:

A composite thin film slider with a protruding R/W device formed by chemical-mechanical polishing to protrude above its substrate and thereby reduce the distance between the R/W device and the recording media. The slider includes a ceramic or non-ceramic substrate with a substantially planar bearing surface, and a R/W device. The R/W device includes an insulator and certain conductive R/W components, deposited onto the substrate's deposit end. The R/W components may include, for example, a magnetic shield layer, a MR stripe layer, and a magnetic pole tip layer, all layered over the deposit end of the substrate. The R/W components protrude from the insulator sufficiently to extend past the substrate's bearing surface. To manufacture this slider, a substrate with the R/W device deposited thereon is polished with a lapping slurry to disproportionately erode the substrate and insulator with respect to the R/W components. The R/W components therefore protrude from the insulator and the ceramic substrate's bearing surface.

US Patent:

57575916, May 26, 1998

Filed:

Nov 25, 1996

Appl. No.:

8/756294

Inventors:

Jeffrey William Carr - Morgan Hill CA
Moris Musa Dovek - San Carlos CA
Mohamad Towfik Krounbi - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 539
G11B 540
G11B 560

US Classification:

360113

Abstract:

A magnetoresistive read/inductive write magnetic head assembly formed on a hard electrically insulating substrate and having electrostatic discharge protection comprises: a hard electrically insulating substrate, preferably formed of sapphire or alumina-TiC; multiple alumina layers formed over the substrate; a magnetoresistive read/inductive write head positioned between the alumina layers; a silicon layer supported by the substrate; and a semiconducting circuit integrated into the silicon layer and interconnected with said magnetoresistive read/write inductive write head to provide electrostatic discharge protection to the head. The silicon layer may be epitaxially grown on the substrate when implemented as sapphire, or bonded to the substrate when implemented as alumina-TiC. The hard electrically insulating substrate and alumina layers provide the assembly with a hard air bearing surface having generally uniform lapping and etching characteristics, and excellent durability.

US Patent:

57617902, Jun 9, 1998

Filed:

Nov 12, 1996

Appl. No.:

8/747551

Inventors:

Jeffrey William Carr - Morgan Hill CA
Jeffrey Paul Gunder - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 5127

US Classification:

2960315

Abstract:

A composite thin film slider with a protruding R/W device formed by chemical-mechanical polishing to protrude above its substrate and thereby reduce the distance between the R/W device and the recording media. The slider includes a ceramic or non-ceramic substrate with a substantially planar bearing surface, and a R/W device. The R/W device includes an insulator and certain conductive R/W components, deposited onto the substrate's deposit end. The R/W components may include, for example, a magnetic shield layer, a MR stripe layer, and a magnetic pole tip layer, all layered over the deposit end of the substrate. The R/W components protrude from the insulator sufficiently to extend past the substrate's bearing surface. To manufacture this slider, a substrate with the R/W device deposited thereon is polished with a lapping slurry to disproportionately erode the substrate and insulator with respect to the R/W components. The R/W components therefore protrude from the insulator and the ceramic substrate's bearing surface.