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Patent Agency Ranking
公开(公告)号：JPH11213350A
公开(公告)日：1999-08-06
申请号：JP28901398
申请日：1998-10-12
Applicant: IBM
Inventor： FONTANA JR ROBERT E , PARKIN STUART STEPHEN PAPWORTH , TSANG CHING HWA , WILLIAMS MASON LAMAR
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic tunnel junction magneto-resistance reading head for magnetic recording system which gives a large output signal. SOLUTION: The magneto-resistance read head is provided with an MTJ detection or free ferromagnetic layer 132 functioning as a magnetic flux guide which directs a magnetic flux from a magnetic recording medium to a tunnel junction 100, and an MTJ fixed ferromagnetic layer 118 and an MTJ tunnel barrier layer 120 are provided with front edge parts 206 and 210 which are approximately level with the detection surface of the head, and the fixed ferromagnetic layer 118 and the free ferromagnetic layer 132 are brought into contact with opposite faced of the MTJ tunnel barrier layer 120, and the free ferromagnetic layer 132 is extended beyond the rear edge part of one of the free ferromagnetic layer 132 and the tunnel barrier layer 118 which has the rear edge part 208 or 212 nearer to the detection surface, and it is secured that the magnetic flux is non-zero in the tunnel junction area. The direction of magnetization of the fixed ferromagnetic layer 118 is fixed in the direction perpendicular to the detection surface by surface exchange coupling with an antiferromagnetic layer 116. The direction of magnetization of the free ferromagnetic layer 132 is made parallel with the surface of a medium when an applied magnetic field is zero, and it is freely rotated when an applied magnetic field exists.
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公开(公告)号：DE69204869T2
公开(公告)日：1996-05-02
申请号：DE69204869
申请日：1992-01-16
Applicant: IBM
Inventor： FONTANA ROBERT EDWARD , ROMANKIW LUBOMYR TARAS , WILLIAMS MASON LAMAR
Abstract: An integrated inductive write, magnetoresistive (MR) read thin film magnetic head comprising an open magnetic yoke having outside legs each having a winding thereon and a central leg having an opening across which the MR element is coupled. The outer legs are overlapped at one end to form confronting pole pieces having a transducing gap between the pole pieces, and the central leg is positioned between the pole pieces at one end and joined with the outer legs at the other end to form a symmetrical magnetic yoke structure. The windings are wound in a direction so that the flux produced by equally energizing the windings is equal and opposite in each of the outside legs, is additive at the transducing gap between the pole pieces, and produces no net flux through the central leg.
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公开(公告)号：DE69204869D1
公开(公告)日：1995-10-26
申请号：DE69204869
申请日：1992-01-16
Applicant: IBM
Inventor： FONTANA ROBERT EDWARD , ROMANKIW LUBOMYR TARAS , WILLIAMS MASON LAMAR
Abstract: An integrated inductive write, magnetoresistive (MR) read thin film magnetic head comprising an open magnetic yoke having outside legs each having a winding thereon and a central leg having an opening across which the MR element is coupled. The outer legs are overlapped at one end to form confronting pole pieces having a transducing gap between the pole pieces, and the central leg is positioned between the pole pieces at one end and joined with the outer legs at the other end to form a symmetrical magnetic yoke structure. The windings are wound in a direction so that the flux produced by equally energizing the windings is equal and opposite in each of the outside legs, is additive at the transducing gap between the pole pieces, and produces no net flux through the central leg.
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公开(公告)号：DE68912610T2
公开(公告)日：1994-06-23
申请号：DE68912610
申请日：1989-02-02
Applicant: IBM
Inventor： WILLIAMS MASON LAMAR , COUFAL HANS JUERGEN
Abstract: A magnetic head assembly for supporting a magnetic head a small uniform spacing above the surface of a magnetic recording medium comprising a slider body having a layer of superconducting material on the surface of the slider body which faces the surface of the magnetic recording medium. The magnetic head assembly is maintained in a vacuum of a predetermined level or in a gas, and the superconducting layer is cooled to a temperature below its critical temperature so that the magnetic head assembly and is levitated to a small uniform spacing above the surface of the magnetic recording medium due to magnetic forces between the magnetized magnetic recording medium and the layer of superconducting material.
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公开(公告)号：DE68912610D1
公开(公告)日：1994-03-10
申请号：DE68912610
申请日：1989-02-02
Applicant: IBM
Inventor： WILLIAMS MASON LAMAR , COUFAL HANS JUERGEN
Abstract: A magnetic head assembly for supporting a magnetic head a small uniform spacing above the surface of a magnetic recording medium comprising a slider body having a layer of superconducting material on the surface of the slider body which faces the surface of the magnetic recording medium. The magnetic head assembly is maintained in a vacuum of a predetermined level or in a gas, and the superconducting layer is cooled to a temperature below its critical temperature so that the magnetic head assembly and is levitated to a small uniform spacing above the surface of the magnetic recording medium due to magnetic forces between the magnetized magnetic recording medium and the layer of superconducting material.
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