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公开(公告)号：GB2275360B
公开(公告)日：1996-07-17
申请号：GB9401189
申请日：1994-01-21
Applicant: IBM
Inventor： CHEN MAO-MIN , GALLAGHER TIMOTHY JOSEPH , WANG PO-KANG
Abstract: A magnetoresistive (MR) read transducer and method of fabricating same. A soft magnetic layer and an MR layer extend over a central active region and passive end regions of the transducer. A nonmagnetic spacer layer separates the soft magnetic film layer and MR layer and extends over the central active region and at least part of both passive end regions. An antiferromagnetic layer directly contacts the MR layer only in the end regions and produces an exchange bias field between the antiferromagnetic layer and the MR layer that is oriented at a preselected acute angle to the longitudinal direction of the transducer. This results in the MR layer being oriented at the preselected acute angle and the soft magnetic film layer in the passive end regions being transversely oriented by magnetostatic coupling to the MR layer. To fabricate the transducer, the antiferromagnetic layer is annealed in an external field above the Neel temperature to produce the canted exchange bias field. As a result of the canting, the magnetic moments of the central active region and the passive end regions are matched during a read operation.
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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
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).
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公开(公告)号：SG30326A1
公开(公告)日：1996-06-01
申请号：SG1995000164
申请日：1995-03-25
Applicant: IBM
Inventor： LATIMER JACQUELINE K , CHEN MAO-MIN , GUTBERLET MARY KATHRYN , KROUNBI MOHAMAD TOWFIK , PINARBASI MUSTAFA
IPC: G11B5/39
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公开(公告)号：GB2275360A
公开(公告)日：1994-08-24
申请号：GB9401189
申请日：1994-01-21
Applicant: IBM
Inventor： CHEN MAO-MIN , GALLAGHER TIMOTHY JOSEPH , WANG PO-KANG
Abstract: In a magnetoresistive (MR) read transducer 10 a soft magnetic layer 18 and an MR layer 24 extend over a central active region 12 and passive end regions 14, 16 of the transducer. A nonmagnetic spacer layer 22 separates the soft magnetic film layer 18 and MR layer 24 and extends over the central active region and at least part of both passive end regions. An antiferromagnetic layer 26 directly contacts the MR layer 24 only in the end regions and produces an exchange bias field between the antiferromagnetic layer 26 and the MR layer 24 that is oriented at a preselected acute angle to the longitudinal direction of the transducer, e.g. 40 - 450, thereby causing the MR layer 24 to be oriented at the preselected acute angle and the soft magnetic film layer in 18 the passive end regions being transversely oriented by magnetostatic coupling to the MR layer 24. To fabricate the transducer, the antiferromagnetic layer 26 is annealed in an external field above the Neel temperature to produce the canted exchange bias field. As a result of the canting, the magnetic moments of the central active region and the passive end regions are matched during a read operation.
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公开(公告)号：DE69117916T2
公开(公告)日：1996-10-02
申请号：DE69117916
申请日：1991-12-09
Applicant: IBM
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Patent Agency Ranking
公开(公告)号：DE69117916D1
公开(公告)日：1996-04-18
申请号：DE69117916
申请日：1991-12-09
Applicant: IBM
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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
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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.
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公开(公告)号：SG46462A1
公开(公告)日：1998-02-20
申请号：SG1996004890
申请日：1991-12-09
Applicant: IBM
Inventor： CHANG HENRY CHINLIN , HORNG CHENG TZONG , CHEN MAO-MIN , SCHWENKER ROBERT OTTO
Abstract: A magnetic head slider having a protective coating on the rails thereof, the protective coating comprising a thin adhesion layer, a thin layer of amorphous hydrogenated carbon, and a thin masking layer. The protective coating is deposited on the air bearing surface of the slider after the thin film magnetic heads are lapped to a chosen dimension, but before the pattern of rails is produced on the air bearing surface. The protective coating protects the magnetic head during the rail fabrication process and in usage in a magnetic recording system protects the magnetic head from wear and corrosion damage.
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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.
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