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1. WO1996006428 - LOW PROFILE THIN FILM WRITE HEAD

Publication Number WO/1996/006428
Publication Date 29.02.1996
International Application No. PCT/GB1995/001997
International Filing Date 23.08.1995
Chapter 2 Demand Filed 12.01.1996
IPC
G11B 5/31 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
31using thin film
CPC
G11B 5/3116
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
31using thin films
3109Details
3116Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
G11B 5/313
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
31using thin films
3109Details
313Disposition of layers
G11B 5/3133
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
31using thin films
3109Details
313Disposition of layers
3133including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure
G11B 5/3163
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
31using thin films
3163Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
Y10T 29/49032
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
29Metal working
49Method of mechanical manufacture
49002Electrical device making
4902Electromagnet, transformer or inductor
49021Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
49032Fabricating head structure or component thereof
Applicants
  • INTERNATIONAL BUSINESS MACHINES CORPORATION [US/US]; Armonk, NY 10504, US
  • IBM UNITED KINGDOM LIMITED [GB/GB]; P.O. Box 41 North Harbour Portsmouth Hampshire PO6 3AU, GB (MC)
Inventors
Agents
  • DAVIES, Simon, Robert; IBM United Kingdom Limited Intellectual Property Dept. Hursley Park Winchester Hampshire SO21 2JN, GB
Priority Data
08/296,30125.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) LOW PROFILE THIN FILM WRITE HEAD
(FR) TETE D'ECRITURE EXTRA-PLATE A COUCHES MINCES
Abstract
(EN)
A thin film low profile write head is provided which has first (48) and second pole pieces (52) which are magnetically connected in a pole tip region (54, 56) and at a back gap (55). The pole tip region is located between the head surface (ABS) and a zero throat height (ZTH) and the head has a body region which is located between the zero throat height and the back gap. A plurality of insulation layers (69, 62, 64) are located above the first pole piece (48) in the body region. Each of the insulation layers has an apex (65, 72, 74) where the insulation layer commences and each insulation layer extends from its apex toward the back gap. The plurality of insulation layers typically includes first (62), second (60) and third (64) insulation layers. In the preferred embodiment the apex of the second insulation layer (65) is located at and defines the zero throat height (ZTH) of the head. This enables a very narrow track width second pole tip (56) to be constructed simultaneously with the second pole piece (52) using ordinary photolithography processes. Further it enables the insulation layers, the coil layer (58) and the second pole piece (52) to be thinner than prior art layer.
(FR)
Tête d'écriture extra-plate à couches minces possédant des première (48) et seconde (52) pièces polaires raccordées de façon magnétique dans une région (54, 56) à corne polaire ainsi qu'au niveau d'un entrefer (55) arrière. La région à corne polaire est située entre la surface de la tête (ABS) et une hauteur d'embouchure zéro (ZTH), et la tête d'écriture possède un corps situé entre la hauteur zéro et l'entrefer. Une pluralité de couches isolantes (69, 62, 64) sont placées au-dessus de la première pièce (48) polaire dans le corps. Chaque couche isolante possède un sommet (65, 72, 74) duquel elle part, et s'étend de ce sommet vers l'entrefer arrière. La pluralité de couches isolantes comprend généralement une première (62), une seconde (60) ainsi qu'une troisième (64) couches isolantes. Dans un mode de réalisation préféré, le sommet (65) de la seconde couche est placé au niveau de la hauteur zéro (ZTH) de la tête et délimite cette hauteur, ce qui permet de construire une seconde corne (56) polaire à largeur de piste très étroite, simultanément avec la seconde pièce (52) polaire, à l'aide de procédés ordinaires de photolithographie, les couches isolantes, la couche (58) de bobinage et la seconde pièce (52) polaire étant ainsi plus minces que celles de la technique antérieure.
Also published as
CZPV1997-196
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