公开(公告)号：BR9501865A

公开(公告)日：1995-11-07

申请号：BR9501865

申请日：1995-04-28

Applicant: IBM

Inventor： CHEN MAO-MIN ,  GUTBERLET MARY KATHRYN ,  KROUNBI MOHAMAD TOWFIK ,  LATIMER JACQUELINE K

IPC: G01R33/09 ,  G11B5/39 ,  G11B5/127

Abstract: A magnetoresistive sensor (30) includes a magnetoresistive material, formed on a substrate (50), and having a first edge and a second edge. A first multilayered conductive lead structure (38) is electrically connected to the first edge, and a second multilayered conductive lead structure (40) is electrically connected to the second edge. The first and second conductive lead structures are constructed of multiple layers of thin film materials that alternate between at least one layer of a thin film of a refractory metal (140) interlaid between at least two thin film layers of a highly conductive metal (130,150).

公开(公告)号：DE69021315D1

公开(公告)日：1995-09-07

申请号：DE69021315

申请日：1990-09-28

Applicant: IBM

Inventor： KROUNBI MOHAMAD TOWFIK ,  VOEGELI OTTO ,  WANG PO-KANG

IPC: G11B5/39

公开(公告)号：DE68923539D1

公开(公告)日：1995-08-24

申请号：DE68923539

申请日：1989-12-18

Applicant: IBM

Inventor： KROUNBI MOHAMAD TOWFIK ,  VOEGELI OTTO ,  WANG PO-KANG

IPC: G11B5/39

Abstract: A magnetoresistive (MR) read transducer comprising an MR layer (11) having passive end regions (14) separated by a central active region (12). A longitudinal bias is produced by a thin film (16) of hard magnetic material in the end regions only, and the thin film of hard magnetic material is spaced from the MR layer by a nonmagnetic spacer layer (18) so that a magnetostatic longitudinal bias is produced of a level to maintain the passive end regions of the MR layer in a stable state.

公开(公告)号：DE3783207D1

公开(公告)日：1993-02-04

申请号：DE3783207

申请日：1987-10-16

Applicant: IBM

Inventor： KROUNBI MOHAMAD TOWFIK ,  VOEGELI OTTO ,  TSANG CHING HWA

IPC: G11B5/39

公开(公告)号：DE3678791D1

公开(公告)日：1991-05-23

申请号：DE3678791

申请日：1986-09-26

Applicant: IBM

Inventor： BUTTRY DANIEL ALAN ,  KROUNBI MOHAMAD TOWFIK ,  MELROY OWEN RALPH

IPC: C23F1/00 ,  C04B41/53 ,  C04B41/91 ,  H01L21/308 ,  H01L21/311 ,  H05K1/03 ,  H05K3/00 ,  H05K3/46 ,  H01L21/31

公开(公告)号：DE69420789D1

公开(公告)日：1999-10-28

申请号：DE69420789

申请日：1994-07-04

Applicant: IBM

Inventor： CHEN MAO-MIN ,  FONTANA ROBERT EDWARD ,  KROUNBI MOHAMAD TOWFIK ,  KUNG KENNETH TING-YUAN ,  LEE JAMES HSI-TANG ,  LO JYH-SHLIEY JERRY ,  TSANG CHING HWA ,  WANG PO-KANG

IPC: G11B5/39

Abstract: A magnetoresistive (MR) read transducer is disclosed having passive end regions separated by a central active region in which an MR layer is formed over substantially only the central active region and in which a magnetic bias layer is formed in each passive end region. In one embodiment, each of the magnetic bias layers includes a layer of ferromagnetic material and a layer of antiferromagnetic material overlaying and in contact with the ferromagnetic layer to provide an exchange-coupled magnetic bias field. Alternatively a hard magnetic material is used to form the biasing layer. Each of the magnetic bias layers form an abutting junction having magnetic and electrical continuity with the MR layer to produce a stable longitudinal magnetic bias field in the transducer, even when the length of the active region is small to accommodate small track widths.

公开(公告)号：SG66404A1

公开(公告)日：1999-07-20

申请号：SG1997003837

申请日：1997-10-22

Applicant: IBM

Inventor： CARR JEFFREY WILLIAM ,  DOVEK MORIS MUSA ,  KROUNBI MOHAMAD TOWFIK

IPC: G11B5/255 ,  G11B5/39 ,  G11B5/60 ,  G11B5/40 ,  G11B5/127

公开(公告)号：DE69412660D1

公开(公告)日：1998-10-01

申请号：DE69412660

申请日：1994-01-12

Applicant: IBM

Inventor： KROUNBI MOHAMAD TOWFIK ,  KUNG KENNETH TING-YUAN ,  TSANG CHING HWA

IPC: G11B5/39 ,  G11B5/40 ,  H01L43/08

Abstract: A magnetoresistive (MR) read transducer assembly has passive end regions 26 separated by a central active region 20. Layers of a first biasing material 14 and a nonmagnetic decoupling spacer material 16 are deposited on a substrate 12, then covered by a mask 18 only in the central region. By etching or ion milling, those parts of the layers not covered by the mask are removed to define a transverse biasing means in the central region and define the passive end regions. With the same mask remaining in place, a conductive material 22 and exchange layer 24 comprising a second biasing material are deposited over all regions. The mask is removed to define and provide conductor leads and longitudinal biasing means only in the end regions. MR material is thereafter deposited as a continuous thin film 28 in direct contact with the central region containing the transverse biasing means and in direct contact with the end regions containing the longitudinal biasing means. This fabrication technique has no critical etching steps requiring stopping at or near a particular interface and the MR film provides a continuous platform for carrying current without butted junctions in the current path.

公开(公告)号：SG44410A1

公开(公告)日：1997-12-19

申请号：SG1996000218

申请日：1994-07-04

Applicant: IBM

Inventor： CHEN MAO-MIN ,  FONTANA ROBERT EDWARD ,  KROUNBI MOHAMAD TOWFIK ,  KUNG KENNETH TING-YUAN ,  LEE JAMES HSI-TANG ,  LO JYH-SHLIEY JERRY ,  TSANG CHING HWA ,  WANG PO-KANG

IPC: G11B5/39

Abstract: A magnetoresistive (MR) read transducer is disclosed having passive end regions separated by a central active region in which an MR layer is formed over substantially only the central active region and in which a magnetic bias layer is formed in each passive end region. In one embodiment, each of the magnetic bias layers includes a layer of ferromagnetic material and a layer of antiferromagnetic material overlaying and in contact with the ferromagnetic layer to provide an exchange-coupled magnetic bias field. Alternatively a hard magnetic material is used to form the biasing layer. Each of the magnetic bias layers form an abutting junction having magnetic and electrical continuity with the MR layer to produce a stable longitudinal magnetic bias field in the transducer, even when the length of the active region is small to accommodate small track widths.

公开(公告)号：SG151194G

公开(公告)日：1995-03-17

申请号：SG151194

申请日：1994-10-17

Applicant: IBM

Inventor： KROUNBI MOHAMAD TOWFIK ,  LOPATIN GERALD GLEN ,  THAYER ARTHUR LEO

IPC: G11B5/245 ,  G11B5/39

Abstract: In a magnetoresistive (MR) read head, an insulating or high resistance layer (22) defines the effective track width over which the read head is sensitive. The insulating or high resistance layer (22) is deposited or patterned to extend a predetermined distance, equal to the desired track width over the MR element (20). Conductor leads (24A, 24B) are deposited in contact with the regions of the MR element (20) not covered by the insulating or high resistance layer with the conductor leads (24A, 24B) extending up to, and possibly overlapping, the edges (28, 30) of the insulating or high resistance layer. When a signal sensing means (32) is connected to the conductor leads (24A, 24B), a read signal is sensed over the length of the MR element (20) covered by the insulating or high resistance layer (22).