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公开(公告)号：DE69216868D1
公开(公告)日：1997-03-06
申请号：DE69216868
申请日：1992-02-07
Applicant: IBM
Inventor： DIENY BERNARD , CURNEY BRUCE ALVIN , METIN SERHAT , PARKIN STUART STEPHEN PAPWORTH , SPERIOSU VIRGIL SIMON
Abstract: A magnetoresistive (MR) sensor comprising a layered structure formed on a substrate (11) includes a first (12) and a second (16) thin film layer (14) of magnetic material separated by a thin film layer of non-magnetic metallic material such as Cu, Au, or Ag, with at least one of the layers of ferromagnetic material formed of either cobalt or a cobalt alloy. The magnetization direction of the first ferromagnetic layer, at zero applied field, is set substantially perpendicular to the magnetization direction of the second ferromagnetic layer which is fixed in position. A current flow is produced through the sensor, and the variations in voltage across the MR sensor are sensed due to the changes in resistance produced by rotation of the magnetization in the front layer of ferromagnetic material as a function of the magnetic field being sensed.
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公开(公告)号：SG47343A1
公开(公告)日：1998-04-17
申请号：SG1995000277
申请日：1995-04-18
Applicant: IBM
Inventor： WU ANTHONY WAI , KAUFMAN JAMES HARVEY , DOERNER FRANCES , METIN SERHAT , MIRZAMAANI SEYYED MOHAMMAD T
Abstract: A thin film cobalt alloy magnetic recording disk (50) has a texturing layer (52) located between the disk substrate (51) and the top surface of the disk to provide texturing of the disk (50) at the head-disk interface. The texturing layer (52) is made up of generally contiguous clusters of aluminum nitride (AlN) with rounded upper surfaces. The AlN texturing layer (52) is formed by sputtering an Al target in the presence of N2 gas. The subsequently sputter-deposited layers replicate the upper surface of the contiguous AlN clusters, resulting in a textured surface at the head-disk interface. The AlN texturing layer (52) may also be sputter deposited above the magnetic layer (56) in the middle of the protective carbon overcoat (61-62). The density and size of the AlN clusters in the texturing layer (52), and thus the texture of the completed disk at the head-disk interface, are controlled by the amount of N2, the sputtering power and pressure, and the substrate (51) temperature.
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Patent Agency Ranking
公开(公告)号：DE69227013T2
公开(公告)日：1999-06-02
申请号：DE69227013
申请日：1992-12-07
Applicant: IBM
Inventor： FRANCO LUIS PADILLA , KAUFMAN JAMES HARVEY , METIN SERHAT , PALMER DANNY DEAN , SAPERSTEIN DAVID DORN , WU ANTHONY WAI
Abstract: A thin film metal alloy magnetic recording disk has a protective nitrogen-containing carbon overcoat which is thinner and which exhibits better wear resistance, corrosion resistance, and hardness than conventional carbon overcoats without nitrogen. The nitrogen present in the disk overcoat substantially reduces the film stress. Because of the low stress of the overcoat film there is significantly less likelihood that the overcoat will delaminate, buckle, or otherwise wear away from the underlying magnetic layer during operation of the disk file. This allows for significantly reduced overcoat thickness, thus reducing the head-disk spacing in the disk file. The overcoat, even though significantly thinner than prior art carbon overcoats, exhibits better wear and corrosion resistance than carbon overcoats without nitrogen. In addition, when the carbon overcoat contains hydrogen, the presence of the nitrogen increases the hardness of the film if present in a specific amount dependent on the amount of hydrogen present.
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公开(公告)号：DE69227013D1
公开(公告)日：1998-10-22
申请号：DE69227013
申请日：1992-12-07
Applicant: IBM
Inventor： FRANCO LUIS PADILLA , KAUFMAN JAMES HARVEY , METIN SERHAT , PALMER DANNY DEAN , SAPERSTEIN DAVID DORN , WU ANTHONY WAI
Abstract: A thin film metal alloy magnetic recording disk has a protective nitrogen-containing carbon overcoat which is thinner and which exhibits better wear resistance, corrosion resistance, and hardness than conventional carbon overcoats without nitrogen. The nitrogen present in the disk overcoat substantially reduces the film stress. Because of the low stress of the overcoat film there is significantly less likelihood that the overcoat will delaminate, buckle, or otherwise wear away from the underlying magnetic layer during operation of the disk file. This allows for significantly reduced overcoat thickness, thus reducing the head-disk spacing in the disk file. The overcoat, even though significantly thinner than prior art carbon overcoats, exhibits better wear and corrosion resistance than carbon overcoats without nitrogen. In addition, when the carbon overcoat contains hydrogen, the presence of the nitrogen increases the hardness of the film if present in a specific amount dependent on the amount of hydrogen present.
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公开(公告)号：BR9204634A
公开(公告)日：1993-06-22
申请号：BR9204634
申请日：1992-12-01
Applicant: IBM
Inventor： FRANCO LUIS P , KAUFMAN JAMES H , METIN SERHAT , PALMER DANNY D , SAPERSTEIN DAVID D , WU ANTHONY W
Abstract: A thin film metal alloy magnetic recording disk has a protective nitrogen-containing carbon overcoat which is thinner and which exhibits better wear resistance, corrosion resistance, and hardness than conventional carbon overcoats without nitrogen. The nitrogen present in the disk overcoat substantially reduces the film stress. Because of the low stress of the overcoat film there is significantly less likelihood that the overcoat will delaminate, buckle, or otherwise wear away from the underlying magnetic layer during operation of the disk file. This allows for significantly reduced overcoat thickness, thus reducing the head-disk spacing in the disk file. The overcoat, even though significantly thinner than prior art carbon overcoats, exhibits better wear and corrosion resistance than carbon overcoats without nitrogen. In addition, when the carbon overcoat contains hydrogen, the presence of the nitrogen increases the hardness of the film if present in a specific amount dependent on the amount of hydrogen present.
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公开(公告)号：SG47386A1
公开(公告)日：1998-04-17
申请号：SG1996000407
申请日：1992-12-07
Applicant: IBM
Inventor： FRANCO LUIS PADILLA , KAUFMAN JAMES HARVEY , METIN SERHAT , PALMER DANNY DEAN , SAPERSTEIN DAVID DORN , WU ANTHONY WAI
Abstract: A thin film metal alloy magnetic recording disk has a protective nitrogen-containing carbon overcoat which is thinner and which exhibits better wear resistance, corrosion resistance, and hardness than conventional carbon overcoats without nitrogen. The nitrogen present in the disk overcoat substantially reduces the film stress. Because of the low stress of the overcoat film there is significantly less likelihood that the overcoat will delaminate, buckle, or otherwise wear away from the underlying magnetic layer during operation of the disk file. This allows for significantly reduced overcoat thickness, thus reducing the head-disk spacing in the disk file. The overcoat, even though significantly thinner than prior art carbon overcoats, exhibits better wear and corrosion resistance than carbon overcoats without nitrogen. In addition, when the carbon overcoat contains hydrogen, the presence of the nitrogen increases the hardness of the film if present in a specific amount dependent on the amount of hydrogen present.
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公开(公告)号：SG42342A1
公开(公告)日：1997-08-15
申请号：SG1996001706
申请日：1992-02-07
Applicant: IBM
Inventor： DIENY BERNARD , GURNEY BRUCE ALVIN , METIN SERHAT , PARKIN STUART STEPHEN PAPWORTH , SPERIOSU VIRGIL SIMON
Abstract: A magnetoresistive (MR) sensor comprising a layered structure formed on a substrate (11) includes a first (12) and a second (16) thin film layer (14) of magnetic material separated by a thin film layer of non-magnetic metallic material such as Cu, Au, or Ag, with at least one of the layers of ferromagnetic material formed of either cobalt or a cobalt alloy. The magnetization direction of the first ferromagnetic layer, at zero applied field, is set substantially perpendicular to the magnetization direction of the second ferromagnetic layer which is fixed in position. A current flow is produced through the sensor, and the variations in voltage across the MR sensor are sensed due to the changes in resistance produced by rotation of the magnetization in the front layer of ferromagnetic material as a function of the magnetic field being sensed.
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