公开(公告)号：CA1304499C

公开(公告)日：1992-06-30

申请号：CA572186

申请日：1988-07-15

Applicant: IBM

Inventor： KROUNBI MOHAMAD T ,  LOPATIN GERALD G ,  THAYER ARTHUR L JR

IPC: G11B5/245 ,  G11B5/39

Abstract: MAGNETORESISTIVE READ TRANSDUCER WITH INSULATOR DEFINED TRACKWIDTH A magnetoresistive (MR) read head is disclosed in which an insulator layer defines the effective track width over which the read head is sensitive. The insulator layer is deposited or patterned to extend a predetermined distance over the MR element, and the predetermined distance is chosen equal to the desired track width. Conductor leads are deposited in contact with the regions of the MR element not covered by the insulator layer with the conductor leads extending up to, and possibly overlapping, the edges of the insulator layer. The signal sensing means is connected to the conductor leads, and the read signal is sensed over the length of the MR element covered by the insulator layer.

公开(公告)号：SG43718A1

公开(公告)日：1997-11-14

申请号：SG1996000137

申请日：1993-02-08

Applicant: IBM

Inventor： JU KOCHAN ,  KROUNBI MOHAMAD T

IPC: G11B5/31

Abstract: A thin film magnetic head comprises a first magnetic yoke layer (12) extending from a back gap region to a sensing edge such as an air bearing surface (ABS), and a second magnetic yoke layer (22) contacting the first magnetic yoke layer at the back gap region and extending to the ABS in a position aligned with, but spaced from, the first magnetic yoke layer (12). A pole tip structure (15), with geometry formed by a single photolithographic process, comprising a first pole tip layer (16), a gap forming layer (18), and a second pole tip layer (20) is positioned between the first and second magnetic yoke layers at the ABS with the first pole tip layer in contact with the first magnetic yoke layer and the second pole tip layer in contact with the second magnetic yoke layer at the ABS.

公开(公告)号：CA1306802C

公开(公告)日：1992-08-25

申请号：CA571402

申请日：1988-07-07

Applicant: IBM

Inventor： KROUNBI MOHAMAD T ,  VOEGELI OTTO

IPC: G11B5/39

Abstract: MAGNETORESISTIVE READ TRANSDUCER A magnetoresistive (MR) read transducer assembly in which the thin film MR layer is longitudinally biased only in the passive regions by exchange bias developed by a thin film of antiferromagnetic material that is deposited in direct contact only in the passive regions of the MR layer and a thin film of soft magnetic material which extends across the transducer assembly. The longitudinal bias is developed by exchange coupling between the thin film of antiferromagnetic material and both the MR layer and the thin film of soft magnetic material in the passive regions. However, the thin film of soft magnetic material is separated from the MR layer in the active region only of the MR layer by a decoupling layer which interrupts the exchange coupling so that transverse bias is produced only in the active region upon connection of a bias source to conductor leads which are connected to the MR layer within the passive region. The transverse bias is produced in that part of the active region of the MR layer in which the bias/sense current and the decoupling layer are both present. Upon connection of a signal sensing means to the conductor leads, an output signal is sensed which detects resistance changes in the MR layer as a function of the fields which are intercepted by the MR layer. SA986024

公开(公告)号：SG44404A1

公开(公告)日：1997-12-19

申请号：SG1996000193

申请日：1993-02-18

Applicant: IBM

Inventor： CHEN MAO-MIN ,  JU KOCHAN ,  KROUNBI MOHAMAD T ,  TSANG CHING HWA ,  WANG PO-KANG

IPC: G11B5/39

Abstract: A magnetoresistive (MR) read transducer having passive end regions (28, 38) separated by a central active region (25, 34) comprises an MR layer (27, 31) made from a material having a low uniaxial magnetic anisotropy. A soft magnetic bias layer (24, 33) is adjacent to but spaced from the MR layer in the central region (25, 34) only, and the soft magnetic bias layer (24, 33) is made from a material having a high uniaxial magnetic anisotropy. A longitudinal bias is produced directly in each of the end regions (28, 38) only, and the means for producing the longitudinal bias comprises a layer (26) made from a material having a high uniaxial magnetic anisotropy. Control of the uniaxial anisotropy can be achieved by choosing materials of appropriate magnetostriction or intrinsic uniaxial anisotropy.

公开(公告)号：DE68927399T2

公开(公告)日：1997-04-30

申请号：DE68927399

申请日：1989-08-02

Applicant: IBM

Inventor： KROUNBI MOHAMAD T

IPC: G11B5/39

Abstract: A process for the batch fabrication of an array of shielded magnetoresistive (MR) read transducers comprises the steps of depositing a layer (34) of magnetic shield material over the entire surface of a substrate (10), depositing a first non-magnetic gap layer (36) and sputter depositing a layer (38) of MR sensor material in the presence of a magnetic field for orienting the anisotropy axes of the layer of MR sensor material in a chosen direction. The MR sensor layer (38) and the first gap layer (36) are patterned to produce a plurality of MR read transducers, and the first magnetic shield layer (34) is then patterned to produce a first shield for each of the MR read transducers. A second gap layer (26) and a second shield layer (28) are patterned to produce a second shield for each of the MR read transducers.

公开(公告)号：DE68927399D1

公开(公告)日：1996-12-05

申请号：DE68927399

申请日：1989-08-02

Applicant: IBM

Inventor： KROUNBI MOHAMAD T

IPC: G11B5/39

Abstract: A process for the batch fabrication of an array of shielded magnetoresistive (MR) read transducers comprises the steps of depositing a layer (34) of magnetic shield material over the entire surface of a substrate (10), depositing a first non-magnetic gap layer (36) and sputter depositing a layer (38) of MR sensor material in the presence of a magnetic field for orienting the anisotropy axes of the layer of MR sensor material in a chosen direction. The MR sensor layer (38) and the first gap layer (36) are patterned to produce a plurality of MR read transducers, and the first magnetic shield layer (34) is then patterned to produce a first shield for each of the MR read transducers. A second gap layer (26) and a second shield layer (28) are patterned to produce a second shield for each of the MR read transducers.

公开(公告)号：DE69302725T2

公开(公告)日：1996-11-28

申请号：DE69302725

申请日：1993-02-08

Applicant: IBM

Inventor： JU KOCHAN ,  KROUNBI MOHAMAD T

IPC: G11B5/31

Abstract: A thin film magnetic head comprises a first magnetic yoke layer (12) extending from a back gap region to a sensing edge such as an air bearing surface (ABS), and a second magnetic yoke layer (22) contacting the first magnetic yoke layer at the back gap region and extending to the ABS in a position aligned with, but spaced from, the first magnetic yoke layer (12). A pole tip structure (15), with geometry formed by a single photolithographic process, comprising a first pole tip layer (16), a gap forming layer (18), and a second pole tip layer (20) is positioned between the first and second magnetic yoke layers at the ABS with the first pole tip layer in contact with the first magnetic yoke layer and the second pole tip layer in contact with the second magnetic yoke layer at the ABS.

公开(公告)号：DE69302725D1

公开(公告)日：1996-06-27

申请号：DE69302725

申请日：1993-02-08

Applicant: IBM

Inventor： JU KOCHAN ,  KROUNBI MOHAMAD T

IPC: G11B5/31

Abstract: A thin film magnetic head comprises a first magnetic yoke layer (12) extending from a back gap region to a sensing edge such as an air bearing surface (ABS), and a second magnetic yoke layer (22) contacting the first magnetic yoke layer at the back gap region and extending to the ABS in a position aligned with, but spaced from, the first magnetic yoke layer (12). A pole tip structure (15), with geometry formed by a single photolithographic process, comprising a first pole tip layer (16), a gap forming layer (18), and a second pole tip layer (20) is positioned between the first and second magnetic yoke layers at the ABS with the first pole tip layer in contact with the first magnetic yoke layer and the second pole tip layer in contact with the second magnetic yoke layer at the ABS.