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公开(公告)号：CA2102087C
公开(公告)日：1998-11-24
申请号：CA2102087
申请日：1993-10-29
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
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：BR9504583A
公开(公告)日：1997-05-20
申请号：BR9504583
申请日：1995-10-27
Applicant: IBM
Inventor： DOVEK MORIS MUSA , FONTANA ROBERT EDWARD , SIMONE VIRGIL , SPONG JACQUELINE KETNER
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：CA2158304A1
公开(公告)日：1996-05-05
申请号：CA2158304
申请日：1995-09-14
Applicant: IBM
Inventor： DOVEK MORIS MUSA , FONTANA ROBERT EDWARD JR , SPERIOSU VIRGIL SIMON , SPONG JACQUELIN KETNER
Abstract: A magnetic field sensor uses four individual magnetoresistive spin valve elements electrically connected in a bridge circuit. The spin valve elements are lithographically formed on the same substrate with their free layers 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 to be antiparallel to the direction of magnetization of the other two pinned layers. The bridge circuit output voltage is responsive to an external magnetic field in the plane of the sensor. By appropriate fixing of the direction of magnetization of the pinned layers during sensor fabrication, and appropriate connection to the input and output leads, the bridge circuit output voltage is a measure of either the magnetic field or field gradient. The fixing conductor, or a separate current strap formed on the substrate, can be used to pass an unknown current over the sensor, in which case the bridge circuit output voltage is a measure of the unknown current.
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公开(公告)号：DE69534013T2
公开(公告)日：2006-05-04
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：DE69427441D1
公开(公告)日：2001-07-19
申请号：DE69427441
申请日：1994-07-05
Applicant: IBM
Inventor： BEST GEORGE LAWRENCE , DOVEK MORIS MUSA , FOSTER JOHN STUART , FRANCO LUIS PADILLA , KERTH RANDALL THOMAS
Abstract: A data recording disk drive a low-flying air-bearing slider that is also able to be in contact and near contact with the lubricant film on the disk. The slider has a front air-bearing surface in the form of a pair of equally-spaced air-bearing pads 25, 27, a rear air-bearing pad 29, and a central nonair-bearing recessed surface 28 which separates the front and rear air-bearing pads. The two front pads have a surface area greater than that of the rear pad and thus provide a positive pitch up of the slider. This causes the rear pad to also be pitched up so that air can flow beneath the rear pad to generate an air bearing in the rear portion of the slider. The presence of the central nonair-bearing region eliminates any lift in the central part of the slider, which allows for the low-flying height. The flying height of the rear pad of the slider above the disk is controlled by the width of the rear air-bearing pad. The rear pad has its leading edge 31 wider than its trailing edge 33 so that it is able to withstand contact with the lubricant film on the disk, typically at the lower disk velocities near the disk inside diameter, without generating unacceptable drag forces or depleting the lubricant from the disk. The rear pad also has a skewed leading edge which compensates for skew of the slider to minimize the flying height variation from the disk inside diameter to outside diameter.
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Patent Agency Ranking
公开(公告)号：AT201524T
公开(公告)日：2001-06-15
申请号：AT94901867
申请日：1993-11-24
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
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：HU216673B
公开(公告)日：1999-08-30
申请号：HU9502416
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：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
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公开(公告)号：RU2113019C1
公开(公告)日：1998-06-10
申请号：RU95118287
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: FIELD: information storage equipment using hard drives with magnetoresistive reader. SUBSTANCE: device has hard drive for magnetic recording, hard drive rotation unit, magnetoresistive head, which is mounted on holder, unit which provides contact of holder to disk, unit for processing signal which is read by magnetoresistive head, holder movement drive. Disk is covered with liquid film. Holder has unit for keeping holder on liquid substrate. Disk drive has unit for decreasing effect of signal modulation caused by alternation of magnetoresistive detector cooling caused by difference in distance between disk and head due to buckles on disk surface. Goal of invention is achieved by filter which is introduced into signal for processing of signal to be read. Parameters of detector decrease modulation effect. Length of holder which contacts disk is less than disk buckles period. EFFECT: decreased signal modulation caused by disk buckles. 16 cl, 14 dwg
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公开(公告)号：DE69314692D1
公开(公告)日：1997-11-27
申请号：DE69314692
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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