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31. 发明专利

JPS63119092A MAGNETIC MEMORY ELEMENT 失效
公开(公告)号：JPS63119092A
公开(公告)日：1988-05-23
申请号：JP26371886
申请日：1986-11-07
申请人： HITACHI LTD
发明人： IKEDA HITOSHI , MARUYAMA YOJI , SUZUKI MAKOTO
IPC分类号： G11C19/08 , G11C11/14
摘要： PURPOSE:To attain high density of a Bloch line memory by modulating the magnetization of a garnet along a magnetic wall periodically. CONSTITUTION:A rare-earth iron garnet film is used for the magnetic film, and an iron substitution element (Si, Ge, Al, Sc, Mn, V or Ga) is coated or ionized and radiated to a part of the garnet film and a part of the film magnetization under the iron substitution element in the film thickness direction is decreased or increased via a process applying heat treatment at a lower temperature than the film forming temperature. Since the magnetization of the minute part is modified locally by having only to enable to apply minute processing at a resist pattern level, the bit and strip fixation at the minute region is attained and the Bloch line memory is formed with high density. As a result, since a drive magnetic field and a magnetic field (for read/write) for operating the function part are applied as specified by a simple pattern, the operating margin is expanded.

32. 发明专利

JP2002008209A COMPOSITE THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JP2002008209A
公开(公告)日：2002-01-11
申请号：JP2000194872
申请日：2000-06-23
申请人： HITACHI LTD
发明人： ISHII SEI , MARUYAMA YOJI
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a composite thin film magnetic head that make possible to highly precisely form a narrow track width of 1.0 μm or less and that is reduced in the effect of eddy current on high frequency recording characteristics. SOLUTION: By constituting a magnetic member constituting the recording function part of the composite thin film magnetic head of an upper first magnetic film comprising at least a lower core, a recording gap layer and an upper magnetic pole and an upper second magnetic film functioning as an upper yoke, which forms a structure allowing the dimension of a track width to be fabricated with high precision and also enabling the generation of eddy current to be reduced with respect to the shape of the upper first second connecting areas, the high frequency characteristics are realized, along with high recording density, for the composite thin film magnetic head.

33. 发明专利

JP2000057523A MAGNETIC HEAD AND MAGNETIC RECORDING DEVICE USING IT 失效
公开(公告)号：JP2000057523A
公开(公告)日：2000-02-25
申请号：JP23135498
申请日：1998-08-18
申请人： HITACHI LTD
发明人： NAKAMURA ATSUSHI , MARUYAMA YOJI , AKAGI KYO , TAKANO KOJI
IPC分类号： G11B5/31 , G11B5/23
摘要： PROBLEM TO BE SOLVED: To reduce bleeding at the end of at least one recording bit, without adding a large modification to a head making process, by forming two magnetic poles so that their ends of at least one side coincide with each other. SOLUTION: In the magnetic pole structure viewed from the floating face side of a magnetic head, the two magnetic poles are formed so that, among the ends 103-106 of the opposing two magnetic poles 101, 102, a straight line connecting the ends 103, 105 on the same side against the center line 107 of a narrower magnetic pole is parallel to the normal line direction 109 of the opposing face 108 of the pole. In other words, the ends of at least one side of the two magnetic poles coincide with each other. In the distribution of a leakage magnetic field in the magnetic head in which the poles are formed in such a positional relation, the leakage magnetic field at the end with the pole ends in coincidence has less curvature, producing less blotting in recording. Incidentally, the two points coincide in which the ends 103, 105 of the magnetic pole are projected to the opposing face 108 of the pole.

34. 发明专利

JPH10269523A MAGNETIC HEAD AND MAGNETIC RECORDER USING IT 失效
公开(公告)号：JPH10269523A
公开(公告)日：1998-10-09
申请号：JP7717397
申请日：1997-03-28
申请人： HITACHI LTD
发明人： MARUYAMA YOJI , HARA YOSHINORI , FUKUI HIROSHI , FUYAMA MORIAKI , KOMURO MATAHIRO , OKADA TOSHIHIRO , TAKANO KOJI
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a magnetic head provided with a narrow track and driven by a high frequency wave and to provide an ultra high density recorder using this magnetic head. SOLUTION: This magnetic head is provided with a coil 26 conductor held between a first magnetic film pattern 25 and a fourth magnetic film pattern 27, a second magnetic film pattern 32 magnetically connected to this first magnetic film pattern 25, a third magnetic film pattern 33 magnetically connected to this fourth magnetic film pattern 27 and a magnetic gap 10 held between these second magnetic film pattern 32 and third magnetic film pattern 33. In such a case, this magnetic head is made the magnetic head where an insulative and non-magnetic single film being in contact with the second magnetic film pattern 32 and the third magnetic film pattern 33 covers at least the first magnetic film patter 25. Thus, the magnetic head provided with the narrow track (1 μm or below) and driven by the high frequency wave (150 MHz) is obtained, and ultra high density recording of a 10 Gb/in class becomes possible by the magnetic recorder using it.

35. 发明专利

JPH103613A THIN-FILM MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPH103613A
公开(公告)日：1998-01-06
申请号：JP15370796
申请日：1996-06-14
申请人： HITACHI LTD
发明人： YOSHIDA NOBUO , OKADA TOSHIHIRO , MARUYAMA YOJI , YAMAMOTO HISANO , FUYAMA MORIAKI
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a thin-film magnetic head capable of dealing with a higher recording density by forming a narrow-track width and high-aspect magnetic core with high accuracy. SOLUTION: A flame plating method is used for forming the upper magnetic core 14 on the medium-facing surface of the thin-film magnetic head when the magnetic gap 3 width of the upper magnetic core 14 is =2.0μm and the aspect ratio thereof is >=1.0. The flames used for the plating method form plural multilayered films. Resist films which are the uppermost layers of the multilayered films are patterned and formed by photolithography and reactive ion etching is executed one or plural times to transfer the patterns to the lower layers. The upper magnetic core 14 is formed by using the flames.

36. 发明专利

JPH09312004A PHOTOMASK, AND MAGNETIC HEAD PRODUCED BY USING THE SAME 失效
公开(公告)号：JPH09312004A
公开(公告)日：1997-12-02
申请号：JP12957896
申请日：1996-05-24
申请人： HITACHI LTD
发明人： YAMAMOTO HISANO , MARUYAMA YOJI , AIHARA MAKOTO
IPC分类号： C23F1/00 , G11B5/31
摘要： PROBLEM TO BE SOLVED: To form an upper magnetic pole of a thin film magnetic head with good accuracy and good reproducibility by forming a photomask for a magnetic pole in such a manner that the photomask consists of a first frame pattern surrounding a magnetic pole pattern which constitutes a portion of a magnetic circuit, and a second frame pattern present in the outside region of the magnetic pole pattern. SOLUTION: A second frame pattern 11 parallel to the X-axis and Y-axis is formed in the photomask for an upper magnetic pole so that a first frame pattern 7 surrounding the magnetic pole pattern 10 which constitutes a portion of a magnetic circuit is connected to the second frame pattern 11 and that the second frame pattern 11 is present only in the outside region of the magnetic pole pattern 10. The upper magnetic pole 10 of a thin film magnetic head is formed by plating a step consisting of a coil 4 and an insulating layer 5. By using the photomask having the second frame pattern 1 connected to the adjacent first frame patterns 7, an enough function to support the first frame pattern 7 from falling can be obtd.

37. 发明专利

JPH08263821A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH08263821A
公开(公告)日：1996-10-11
申请号：JP6421495
申请日：1995-03-23
申请人： HITACHI LTD
发明人： AIHARA MAKOTO , MARUYAMA YOJI , SHIROISHI YOSHIHIRO , TSUCHIYA REIJIROU , SUZUKI MIKIO , AKAGI KYO , IDE HIROSHI
IPC分类号： G11B5/10 , G11B5/31 , G11B5/55 , G11B5/58 , G11B5/60 , G11B5/64 , G11B5/73 , G11B5/82 , G11B21/10 , G11B21/21 , G11B25/04
摘要： PURPOSE: To cause a magnetic head to highly precisely follow a data track and perform reliable and highly dense recording. CONSTITUTION: A magnetic head 63 with its continuously slidable tip part 67 is used for a magnetic recording medium 2, a groove is provided on the magnetic recording medium 2, and by sliding the tip of the magnetic head 63 along this groove, a data track is followed. The groove is formed by etching a protective film 28 formed on a magnetic film 27. The groove on the surface of the magnetic recording medium is formed in a concentric circle or in a spiral form.

38. 发明专利

JPH08249601A MAGNETIC RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH08249601A
公开(公告)日：1996-09-27
申请号：JP4524895
申请日：1995-03-06
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAKAYAMA TAKANOBU , YOSHIDA KAZUYOSHI , SUZUKI MIKIO , MARUYAMA YOJI , HIRAYAMA YOSHIYUKI , FUTAMOTO MASAAKI , HONDA YUKIO
IPC分类号： G11B5/66 , G11B5/02 , G11B5/127 , G11B5/64
摘要： PURPOSE: To obtain a magnetic recording device with an improved reproduction output/medium noise ratio. CONSTITUTION: A ring-type magnetic head is used for a magnetic recording medium with vertical magnetic anisotropy or oblique direction magnetic anisotropy to record information magnetically. A magnetic recording medium is a thin-film magnetic recording medium 1 and the density of the constituent in vertical direction of a magnetic flux generated from a magnetic pole at the front edge side of a ring-type magnetic head 2 is larger than that of a constituent in vertical direction of a magnetic flux generated from a rear-edge- side magnetic pole, thus obtaining a high reproduction output/medium noise ratio with a high line recording density of 150kFCI or larger.

39. 发明专利

JPH08203058A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPH08203058A
公开(公告)日：1996-08-09
申请号：JP861995
申请日：1995-01-24
申请人： HITACHI LTD
发明人： KAEDE HIROSHI , KUGIYA FUMIO , MARUYAMA YOJI , AKAGI KYO , KOMODA MIGAKU
IPC分类号： G11B5/66 , G11B5/09 , G11B5/56 , G11B5/596 , G11B5/64 , G11B5/65 , G11B5/738 , G11B5/84
摘要： PURPOSE: To produce a perpendicular magnetic recording medium having a servo-pattern small in surface unevenness and to provide its producing method. CONSTITUTION: A magnetic characteristic such as magnetic anisotropy, residual magnetization and coercieve force of a magnetic film 3 is selectively changed in accordance with the servo-pattern by partially changing the presence or absence and the film thickness, etc., of an under coat film 2 for controlling an orientation of the magnetic film 3, in accordance with a servo-pattern or by subjecting the magnetic film to laser-annealing. Then, a signal generated when the pattern is scanned with a magnetic head is used as a servo-signal for positioning of the magnetic head. And, a ROM pattern is formed by the same method.

40. 发明专利

JPH07311916A MAGNETIC HEAD AND MAGNETIC RECORDING/REPRODUCING APPARATUS 失效
公开(公告)号：JPH07311916A
公开(公告)日：1995-11-28
申请号：JP10022594
申请日：1994-05-13
申请人： HITACHI LTD
发明人： MARUYAMA YOJI
IPC分类号： G11B5/187 , G11B5/29 , G11B5/39 , G11B5/48
摘要： PURPOSE:To obtain a magnetic head of a type to be in touch with a recording medium which is fit for a high-density magnetic memory device and a manufacture for the magnetic head. CONSTITUTION:A projecting part 1 is formed at an insulating bent body 42 which is mainly composed of a crystal body of silicon and includes a part of silicon oxide, silicon nitride, silicon fluoride and silicon boride. At least a part of a pattern constituting a write functional part such as magnetic poles 27, 28, a coil 26, a magnetoresistance effect detection part 23, an electrode 29, etc., and a pattern constituting a reproducing functional part of the magnetic head is formed at a gentle slope of the projecting part. In this manner, a magnetic head having an improved contact state with a recording medium is manufactured at low costs. Since a stable read signal is ensured, a super-high-density magnetic recording/reproducing apparatus of 10Gb/in or a higher memory density is achieved.

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