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1. 发明专利

JP2005032396A THIN FILM MAGNETIC HEAD 审中-公开
公开(公告)号：JP2005032396A
公开(公告)日：2005-02-03
申请号：JP2003273574
申请日：2003-07-11
申请人： FUJITSU LTD
发明人： KUTSUZAWA TOMOKO , AKIMOTO HIDEYUKI , NISHIDA SHUJI , TAGAWA IKUYA
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a thin-film magnetic head, of which the responsiveness to a high frequency recording is improved. SOLUTION: This thin-film magnetic head has 1st and 2nd magnetic pole parts respectively arranged while holding a gap part between them at the trailing and leading sides of a confronted surface with a magnetic recording medium in the relative moving direction to the magnetic recording medium, and also this magnetic head is equipped with a magnetic core wherein a 1st magnetic layer having the 1st magnetic pole part and a 2nd magnetic layer having the 2nd magnetic pole part are magnetically connected each other, and at least a part of a thin-film coil arranged between the 1st and 2nd magnetic layers in the insulated state with respect to the 1st and 2nd magnetic layers, and it has a feature that the 1st magnetic layer to be a magnetic pole of the trailing side consists of a plurality of magnetic layers and also a saturation magnetic flux density of the magnetic layer of an outermost layer among the plurality of magnetic layers is larger than a saturation magnetic flux density of a magnetic layer adjacent to its inside. COPYRIGHT: (C)2005,JPO&NCIPI

2. 发明专利

JP2001284121A SOFT MAGNETIC MATERIAL AND MAGNETIC HEAD 失效
公开(公告)号：JP2001284121A
公开(公告)日：2001-10-12
申请号：JP2000095896
申请日：2000-03-30
申请人： FUJITSU LTD
发明人： IKEDA SHOJI , UEHARA YUJI , TAGAWA IKUYA , KAKEHI MASAHIRO
IPC分类号： C22C38/00 , G11B5/127 , H01F1/34 , H01F10/14 , H01F41/18
摘要： PROBLEM TO BE SOLVED: To realize a soft magnetic material which is high in saturation magnetic flux density and electrical resistivity and furthermore kept high in soft magnetic properties and frequency characteristics after being formed into a film at a low temperature or subjected to a thermal treatment carried out at a temperature lower than 300 deg.C and a magnetic head formed of the same. SOLUTION: A soft magnetic material is represented by a composition formula FexAlyOz, where x, y, and z are indicated in at.% and set so as to satisfy relations, x+y+z=100, 72 =0.5, and moreover the magnetic material is so formed as to have a uniaxial magnetic anisotropy, when it is formed into a film.

3. 发明专利

JP2001176021A MAGNETIC HEAD, MANUFACTURING METHOD FOR MAGNETIC HEAD AND INFORMATION RECORDING DEVICE 失效
公开(公告)号：JP2001176021A
公开(公告)日：2001-06-29
申请号：JP35117299
申请日：1999-12-10
申请人： FUJITSU LTD
发明人： NISHIDA SHUJI , TAGAWA IKUYA
IPC分类号： G11B5/187 , G11B5/245 , G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a magnetic head having an excellent overwriting characteristic and small recording blotting. SOLUTION: This magnetic head is provided with lower and upper sub- magnetic poles 1 and 5 disposed near a relatively moving magnetic disk 103, and placed oppositely to each other with a specified gap in a relative moving direction A at a point near the magnetic disk. The magnetic head magnetizes the magnetic disk by a magnetic field leaked between the magnetic poles. In a position held between the magnetic poles, a soft magnetic film 3 spread in a direction for blocking the opposing of the magnetic poles, and first and second non-magnetic films 2 and 4 sandwiching the soft magnetic film so as to support it are provided.

4. 发明专利

JPH10241117A RECORDING HEAD FOR VERTICAL MAGNETIZATION MEDIUM OF SINGLE-LAYER MAGNETIC FILM 失效
公开(公告)号：JPH10241117A
公开(公告)日：1998-09-11
申请号：JP3955297
申请日：1997-02-24
申请人： FUJITSU LTD
发明人： TAGAWA IKUYA
IPC分类号： G11B5/31 , G11B5/00 , G11B5/127
摘要： PROBLEM TO BE SOLVED: To provide a recording head for a vertical magnetization medium having a single-layer magnetic film which can obtain a considerably sharp component distribution in a vertical direction of a recording magnetic field. SOLUTION: The recording head for a magnetic medium is provided with a single-layer magnetic film having an easy axis of magnetization inclined from an in-plane direction. The recording head includes a leading pole 18 set at the upstream side to a movement direction of the medium, and a trailing pole 20 having a leading end defining a minute gap to a leading end of the leading pole 18 and a rear end part in touch with the leading pole 18 and, set at the downstream side to the movement direction of the medium. The recording head further includes a coil wound around the contact part between the leading pole 18 and trailing pole 20. A distance between the leading end of the trailing pole 20 and the medium is set to be larger by a predetermined length or more than a distance between the leading end of the leading pole 18 and the medium.

5. 发明专利

JP2003263706A MAGNETIC HEAD 审中-公开
公开(公告)号：JP2003263706A
公开(公告)日：2003-09-19
申请号：JP2003032130
申请日：2003-02-10
申请人： FUJITSU LTD
发明人： OTSUKA YOSHINORI , TAGAWA IKUYA , IKEGAWA YUKINORI , KUTSUZAWA TOMOKO , UEHARA YUJI , HASEGAWA MINORU
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To increase magnetic field intensity by shaping a magnetic pole for a magnetic head. SOLUTION: In a composite magnetic head on which a reproducing head and a recording head are mounted, the recording head has a lower magnetic pole, a recording gap layer, a nonmagnetic insulating layer in which a recording coil is embedded, and an upper magnetic pole, the upper magnetic pole is trimmed to be shaped and, for the upper magnetic pole, a step height Dh from a position in which a step is formed by the trimming, to a floating surface is equal to or lower than 5.0 μm. COPYRIGHT: (C)2003,JPO

6. 发明专利

JP2003229310A SOFT MAGNETIC FILM AND THIN-FILM MAGNETIC HEAD 审中-公开
公开(公告)号：JP2003229310A
公开(公告)日：2003-08-15
申请号：JP2002026404
申请日：2002-02-04
申请人： FUJITSU LTD
发明人： IKEDA SHOJI , KUBOMIYA ATSUYUKI , TAGAWA IKUYA , UEHARA YUJI
IPC分类号： G11B5/31 , G11B5/39 , H01F10/16 , H01F10/26
摘要： PROBLEM TO BE SOLVED: To provide a soft magnetic film which can considerably contribute to the enhancement of a write magnetic field by a thin-film magnetic head. SOLUTION: The thin-film magnet head 32 has a lower magnetic pole 34. A nonmagnetic layer 37 is laminated on the lower magnetic pole 34. A NiFe alloy nonmagnetic base layer 38 is laminated on the nonmagnetic layer 37. An FeCo alloy ferromagnetic layer 35a is formed on the nonmagnetic base layer 38. When the FeCo alloy ferromagnetic layer 35a is laminated, the ferromagnetic layer 35a is provided with uniaxial magnetic anisotropy as well as soft magnetism. The ferromagnetic layer 35a has a high saturation magnetic flux density. A soft magnetic film having a high saturation magnetic flux density is arranged at the end of an upper magnet pole 35. COPYRIGHT: (C)2003,JPO

7. 发明专利

JP2002185059A MAGNETORESISTANCE EFFECT DEVICE 失效
公开(公告)号：JP2002185059A
公开(公告)日：2002-06-28
申请号：JP2000377033
申请日：2000-12-12
申请人： FUJITSU LTD
发明人： TAGAWA IKUYA , YAMADA KENICHIRO
IPC分类号： G01R33/09 , G11B5/31 , G11B5/39 , H01F10/32 , H01L43/08
摘要： PROBLEM TO BE SOLVED: To provide a magnetoresistance effect device that can securely reduce the so-called Barkhausen noise. SOLUTION: The opposite surface of an upper shield layer 35 is prescribed nearly along one plane 51. The upper shield layer 35 faces a magnetic domain control film 42, an electrode film 43, and a magnetoresistance effect film 41. It is expected that residual magnetization Mr will exist in the same direction as magnetization Mg of the magnetic domain control film 42 in the upper shield layer 35, after the magnetic domain control film 42 is polarized. On the surface opposite to the upper shield layer 35, the magnetization Mr cannot easily break off. A magnetic pole cannot be easily generated. Weakening in a vertical bias magnetic field BS can be avoided based on the residual magnetization Mr of the upper shield layer 35.

8. 发明专利

JP2001283419A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JP2001283419A
公开(公告)日：2001-10-12
申请号：JP2000095898
申请日：2000-03-30
申请人： FUJITSU LTD
发明人： TAGAWA IKUYA , MATSUMOTO KOJI
IPC分类号： G11B5/667 , G11B5/64 , G11B5/65 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium and a magnetic storage device capable of reducing medium noise caused by a soft magnetic base layer without reducing recording sensitivity. SOLUTION: In the perpendicular magnetic recording medium constructed by successively laminating an intermediate layer and a perpendicularly magnetized layer on the soft magnetic base layer, the film thickness of the intermediate layer is set to be thicker than that of the perpendicularly magnetized layer.

9. 发明专利

JP2000099920A THIN FILM MAGNETIC HEAD WITH TIP SUBMAGNETIC POLE AND ITS PRODUCTION 失效
公开(公告)号：JP2000099920A
公开(公告)日：2000-04-07
申请号：JP26472798
申请日：1998-09-18
申请人： FUJITSU LTD
发明人： NISHIDA SHUJI , TAGAWA IKUYA , KUTSUZAWA TOMOKO
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To substantially eliminate harmful subpeaks by retreating the floating surface-side end part of an upper magnetic pole from the floating surface-side end part of a tip submagnetic pole in viewing from a floating surface. SOLUTION: The core width of this head is regulated to be substatially narrow by tip submagnetic poles 21, 22 respectively provided on a lower magnetic pole 8 and an upper magnetic pole 16. A recording magnetic field is generated with the gap layer between the tip submagnetic poles 21, 22. When a dimension with which the floating surface-side end part of an upper magnetic pole 16 is retreated from the floating surface-side end part of a tip submagnetic pole 22 is defined as the retreated height SH of the upper magnetic pole, the SH is made to be >=0.1 μm by controlling the retreated height SH of the upper magnetic pole. Moreover, when the thickness of the floating surface-side end part of the tip submagnetic pole 22 is defined as the length SL of the tip submagnetic pole, a ration SL/SH is made to be >=1.0 by controlling the ratio SL/SH of the length SL of the tip submagnetic pole to the retreated height SH of the upper magnetic pole. Both of an overwrite characteristic and an offtrack profile or either of them are improved by controlling the retreated height SH of the upper magnetic pole and the ratio SL/SH.

10. 发明专利

JPH1186238A MAGNETIC HEAD 失效
公开(公告)号：JPH1186238A
公开(公告)日：1999-03-30
申请号：JP24584097
申请日：1997-09-10
申请人： FUJITSU LTD
发明人： TAGAWA IKUYA
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To obtain an apparatus which efficiently generates a recording magnetic field, by forming a first magnetic layer and a first non-magnetic insulating layer in the upper rear of a substrate, arranging a second magnetic layer on the first non- magnetic insulating layer at a front area of the first magnetic layer, arranging a second non-magnetic insulating layer on the second magnetic layer, crossing a coil in the second non-magnetic insulating layer and arranging a third magnetic layer on the second non-magnetic insulating layer. SOLUTION: An upper magnetic pole 14 is formed of a soft magnetic material such as Permalloy or the like and connected to an upper magnetic shield layer 8 with penetrating a central gap of a spiral coil 13 and organic upper and lower insulating layers 12a, 12b. The upper magnetic shield layer 8 becomes a magnetic pole of an induction type head 20 together with the upper magnetic pole 14. The upper magnetic pole 14 comes in touch at a leading end part with an upper face of an insulating gap layer 11. An electric resistance of a lower magnetic shield layer 3 of an MR head 10 is made higher than that of the upper magnetic pole 14, so that an eddy current by a recording magnetic field passing the lower magnetic shield layer 3 is reduced. A component of the recording magnetic field passing through the magnetic shield layer 8 can be output efficiently.

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