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公开(公告)号：JPH06259739A
公开(公告)日：1994-09-16
申请号：JP1612494
申请日：1994-02-10
Applicant: IBM
Inventor： DOVEK MORIS MUSA , FOSTER JOHN STUART , LAM DONALD K F , SAWATZKY ERICH
IPC: G11B5/02 , G11B5/00 , G11B5/012 , G11B5/035 , G11B5/09 , G11B5/31 , G11B5/39 , G11B5/58 , G11B5/60 , G11B20/10 , G11B19/04
Abstract: PURPOSE: To improve the file performance by supporting a magnetoresistive sensor on the rear end of a carrier put on a liquid bearing at the time of bring ing a magnetic recording transducer into contact with a magnetic recording disk during the read or write operation to make a disk file or a disk drive. CONSTITUTION: A transducer carrier 20 consists of a liquid bearing 50 provided on a disk 16 and a magnetic read/induction write head 42 provided on a rear end 44. A magnetic read sensor 60 and an induction write head 62 are formed as thin film layers on the rear end of the carrier 20, and an end part 61 of the sensor 60 is placed between shields 62 and 63 arranged apart from each other. An induction write head 70 constituting the head 42 consists of a coil 73 and a recording gap 75 and is oriented to the surface of the disk 16. The part 61 of the sensor 60 is brought into contact with a liquid bearing 50 provided on the disk 16, and head design is made free so as to be suitable for write because it is unnecessary for the head 70 to read data recorded on the magnetic layer of the disk 16.
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公开(公告)号：JPH10255235A
公开(公告)日：1998-09-25
申请号：JP31309497
申请日：1997-11-14
Applicant: IBM
Inventor： CARR JEFFREY WILLIAM , DOVEK MORIS MUSA , KROUNBI MOHAMAD TOWFIK
Abstract: PROBLEM TO BE SOLVED: To provide a magneto-resistive(MR) reading/inductive writing magnetic head assembly which is formed on a hard electrically insulated substrate to have static electricity discharging(ESD) protection property. SOLUTION: An MR head assembly 50 is preferentially composed of a hard electrically insulated substrate 52 formed of sapphire or alumina TiC, a plurality of alumina layers 54 formed on the substrate, a magneto-resistance reading/ induction writing head 56 arranged between the alumina layers, a silicon layer 58 supported by the substrate and a semiconductor circuit 60 which is built into the silicon layer to provide the static electricity discharging protection property for the head and is connected with the magneto-resistive reading/ inductive writing head. The silicon layer is epitaxially grown on the substrate when it is the sapphire substrate and joined to the substrate when it is the alumina TiC substrate. With the hard electrically insulated substrate and alumina layer, the assembly is provided with a hard air bearing surface 62 having almost uniform overlapping area and etching characteristic and excellent durability.
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公开(公告)号：JP2788600B2
公开(公告)日：1998-08-20
申请号：JP1612494
申请日：1994-02-10
Applicant: IBM
Inventor： DOVEK MORIS MUSA , FOSTER JOHN STUART , LAM DONALD K F , SAWATZKY ERICH
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公开(公告)号：AT159606T
公开(公告)日：1997-11-15
申请号：AT93303064
申请日：1993-04-20
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , DOVEK MORIS MUSA , FOSTER JOHN STUART , HOMOLA ANDREW MARIAN , O'SULLIVAN TIMOTHY CHRISTOPHER
Abstract: A data recording disk file of the liquid-bearing type has an improved head-disk interface provided in by a transducer carrier (100) with new properties. The carrier (100) supports a conventional head (109) for reading and writing data to the disk (130). The carrier has an air-bearing surface (110,112) near its front end, a ski pad (118) near its rear end, and a plurality of ski feet or struts (120,122) which support the air-bearing surface off the liquid film (146) of the disk when the disk file is not operating. The air-bearing surface is in the form of a pair of air-bearing rails (110,112) located outboard of the rear ski pad so that no air-bearing effect occurs in the rearward region of the carrier to assure the skiing action of the rear ski pad. As operational speed is approached the air-bearing lifts the struts off the disk and the rear ski pad is the sole ski foot on the liquid film. The rear ski pad has a convexly shaped leading edge which is wider than its trailing edge to minimize static friction and lubricant thinning during skiing, and the angle between the leading and trailing edges of the pad is selected to enable the pad to ski over the wide ranges of carrier-disk velocity which occur as the carrier moves from disk ID to OD.
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公开(公告)号：ES2157973T3
公开(公告)日：2001-09-01
申请号：ES94901867
申请日：1993-11-24
Applicant: IBM
Inventor： DOVEK MORIS MUSA , FOSTER JOHN STUART , LAM DONALD K F , SAWATZKY ERICH
IPC: G11B5/00 , G11B5/02 , G11B5/012 , G11B5/035 , G11B5/09 , G11B5/31 , G11B5/39 , G11B5/58 , G11B5/60 , G11B20/10
Abstract: A contact magnetic recording rigid disk file utilizes a magnetoresistive (MR) sensor for reading data recorded on the disk. The disk file may be of the liquid-bearing type of contact recording with the MR sensor supported on the trailing end of a carrier which rides on the liquid bearing. The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor by the disk, with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier in contact with the disk surface may be selected to have a length less than the period of the disk waviness so that it more closely follows the disk surface topography.
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Patent Agency Ranking
公开(公告)号：SG64291A1
公开(公告)日：1999-04-27
申请号：SG1996000090
申请日：1993-04-20
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , DOVEK MORIS MUSA , FOSTER JOHN STUART , HOMOLA ANDREW MARIAN , O'SULLIVAN TIMOTHY CHRISTOPHER
Abstract: A data recording disk file of the liquid-bearing type has an improved head-disk interface provided in by a transducer carrier (100) with new properties. The carrier (100) supports a conventional head (109) for reading and writing data to the disk (130). The carrier has an air-bearing surface (110,112) near its front end, a ski pad (118) near its rear end, and a plurality of ski feet or struts (120,122) which support the air-bearing surface off the liquid film (146) of the disk when the disk file is not operating. The air-bearing surface is in the form of a pair of air-bearing rails (110,112) located outboard of the rear ski pad so that no air-bearing effect occurs in the rearward region of the carrier to assure the skiing action of the rear ski pad. As operational speed is approached the air-bearing lifts the struts off the disk and the rear ski pad is the sole ski foot on the liquid film. The rear ski pad has a convexly shaped leading edge which is wider than its trailing edge to minimize static friction and lubricant thinning during skiing, and the angle between the leading and trailing edges of the pad is selected to enable the pad to ski over the wide ranges of carrier-disk velocity which occur as the carrier moves from disk ID to OD.
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7.发明专利
公开(公告)号：PL310176A1
公开(公告)日：1995-11-27
申请号：PL31017693
申请日：1993-11-24
Applicant: IBM
Inventor： DOVEK MORIS MUSA , FOSTER JOHN STUART , LAM DONALD K F , SAWATZKY ERICH
IPC: G11B5/00 , G11B5/02 , G11B5/012 , G11B5/035 , G11B5/09 , G11B5/31 , G11B5/39 , G11B5/58 , G11B5/60 , G11B20/10
Abstract: A contact magnetic recording rigid disk file utilizes a magnetoresistive (MR) sensor for reading data recorded on the disk. The disk file may be of the liquid-bearing type of contact recording with the MR sensor supported on the trailing end of a carrier which rides on the liquid bearing. The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor by the disk, with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier in contact with the disk surface may be selected to have a length less than the period of the disk waviness so that it more closely follows the disk surface topography.
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公开(公告)号：BR9400133A
公开(公告)日：1994-10-04
申请号：BR9400133
申请日：1994-01-19
Applicant: IBM
Inventor： DOVEK MORIS MUSA , FOSTER JOHN STUART , LAM DONALD K F , SAWATZKY ERICH
IPC: G11B5/02 , G11B5/00 , G11B5/012 , G11B5/035 , G11B5/09 , G11B5/31 , G11B5/39 , G11B5/58 , G11B5/60 , G11B20/10 , G11B21/21
Abstract: A contact magnetic recording rigid disk file utilizes a magnetoresistive (MR) sensor for reading data recorded on the disk. The disk file may be of the liquid-bearing type of contact recording with the MR sensor supported on the trailing end of a carrier which rides on the liquid bearing. The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor by the disk, with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier in contact with the disk surface may be selected to have a length less than the period of the disk waviness so that it more closely follows the disk surface topography.
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公开(公告)号：DE69534013D1
公开(公告)日：2005-03-24
申请号：DE69534013
申请日：1995-10-27
Applicant: IBM
Abstract: A magnetic field sensor (10) uses four individual magnetoresistive spin valve elements (A,B,C,D) electrically connected in a bridge circuit. The spin valve elements (A,B,C,D) are lithographically formed on the same substrate with their free layers (36) having their magnetization axes parallel to one another. An electrically conductive fixing layer is formed on the substrate but is insulated from the spin valve elements. The application of current through the fixing conductor during fabrication of the field sensor fixes the direction of magnetization of two of the pinned layers (39) to be antiparallel to the direction of magnetization of the other two pinned layers (39). The bridge circuit (10) output voltage is responsive to an external magnetic field (4) in the plane of the sensor (10). By appropriate fixing of the direction of magnetization of the pinned layers (39) during sensor (10) fabrication, and appropriate connection to the input (20,22) and output leads (24,26), the bridge circuit output voltage is a measure of either the magnetic field or field gradient.
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公开(公告)号：AT289419T
公开(公告)日：2005-03-15
申请号：AT95116943
申请日：1995-10-27
Applicant: IBM
Abstract: A magnetic field sensor (10) uses four individual magnetoresistive spin valve elements (A,B,C,D) electrically connected in a bridge circuit. The spin valve elements (A,B,C,D) are lithographically formed on the same substrate with their free layers (36) having their magnetization axes parallel to one another. An electrically conductive fixing layer is formed on the substrate but is insulated from the spin valve elements. The application of current through the fixing conductor during fabrication of the field sensor fixes the direction of magnetization of two of the pinned layers (39) to be antiparallel to the direction of magnetization of the other two pinned layers (39). The bridge circuit (10) output voltage is responsive to an external magnetic field (4) in the plane of the sensor (10). By appropriate fixing of the direction of magnetization of the pinned layers (39) during sensor (10) fabrication, and appropriate connection to the input (20,22) and output leads (24,26), the bridge circuit output voltage is a measure of either the magnetic field or field gradient.
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