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公开(公告)号：DE68912486T2
公开(公告)日：1994-06-23
申请号：DE68912486
申请日：1989-09-20
Applicant: IBM
Inventor： DESOUCHES ALAIN MICHEL , PAL GEORGE STEPHEN , SALO MICHAEL PAUL , ULLAH MUHAMMAD INAYET , CHURCH MARK ANTHONY , DESHPANDE ANNAYYA PRALHADRAO
Abstract: Each of a row of thin film magnetic transducers (12) formed on a substrate, comprises a magnetoresistive (MR) element, and the row is supported on a holder (18) which has an elongate H-shaped slot near one edge to form a beam member upon which the row is mounted. The beam member is capable of being deflected in a substantially quadratic curvature when subjected to pressure from a pressure transducer (22) at the middle of the beam member. The resistance of each of the MR elements is measured (by 28, 30) during lapping, and control signals are generated (by controller 32) to control the pressure transducers to control lapping with proper BALANCE and BOW and to terminate lapping when the desired MR element height is reached.
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公开(公告)号：SG43168A1
公开(公告)日：1997-10-17
申请号：SG1996004746
申请日：1994-05-25
Applicant: IBM
Inventor： AHLERT RICHARD HENRY , HOWARD JAMES KENT , HYLTON TODD LANIER , PARKER MICHAEL ANDRES , ULLAH MUHAMMAD INAYET
Abstract: A high-density recording media comprising longitudinally oriented polycrystalline barium ferrite exhibits large coercivity, corrosion resistance, high hardness and durability. Films are prepared by on-axis sputtering at ambient temperatures from stoichiometric targets followed by a post-deposition anneal at approximately 850 DEG C. to induce crystallization. Crystallization yields a magnetic film with large in-plane remanence and a fine scale texturing that greatly improves the tribological performance of barium ferrite disks. Exceptional durability can be achieved on disks without overcoats. Grain sizes as small as 200 ANGSTROM are produced by doping with small amounts of Cr2O3 or other additives. Coercivities greater than 4000 Oe are achieved even in small grain films.
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公开(公告)号：DE68912486D1
公开(公告)日：1994-03-03
申请号：DE68912486
申请日：1989-09-20
Applicant: IBM
Inventor： DESOUCHES ALAIN MICHEL , PAL GEORGE STEPHEN , SALO MICHAEL PAUL , ULLAH MUHAMMAD INAYET , CHURCH MARK ANTHONY , DESHPANDE ANNAYYA PRALHADRAO
Abstract: Each of a row of thin film magnetic transducers (12) formed on a substrate, comprises a magnetoresistive (MR) element, and the row is supported on a holder (18) which has an elongate H-shaped slot near one edge to form a beam member upon which the row is mounted. The beam member is capable of being deflected in a substantially quadratic curvature when subjected to pressure from a pressure transducer (22) at the middle of the beam member. The resistance of each of the MR elements is measured (by 28, 30) during lapping, and control signals are generated (by controller 32) to control the pressure transducers to control lapping with proper BALANCE and BOW and to terminate lapping when the desired MR element height is reached.
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