公开(公告)号：MY121197A

公开(公告)日：2006-01-28

申请号：MYPI9401782

申请日：1994-07-08

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 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 LAYERS IS FORMED IN EACH PASSIVE END REGION. 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. EACH OF THE MAGNETIC BIAS LAYERS FORM AN ABUTTING JUNCTION HAVING MAGNETIC AND ELECTRICALLY CONTINUITY WITH THE MR LAYER TO PRODUCE A LONGITUDINAL MAGNETIC BIAS FIELD IN THE TRANSDUCER. FIG 2

公开(公告)号：DE69420789T2

公开(公告)日：2000-04-27

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：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：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.