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1. 发明专利

JP2004296000A Magneto-resistance effect type head and manufacturing method therefor 审中-公开
标题翻译：磁阻效应型头及其制造方法
公开(公告)号：JP2004296000A
公开(公告)日：2004-10-21
申请号：JP2003086910
申请日：2003-03-27
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： NISHIOKA KOICHI , SHIGEMATSU KEISHI
IPC分类号： G11B5/00 , G11B5/39
CPC分类号： G11B5/3903 , B82Y10/00 , G11B2005/0008 , Y10T29/49034
摘要： PROBLEM TO BE SOLVED: To provide a constitution in which the fixed layer magnetic moment is stable to a large external magnetic field, and the direction of magnetization of the fixed layer can be controlled by magnetic field applying treatment at room temperature, and to provide the magnetic field applying treatment. SOLUTION: In a magneto-resistance effect type head, the fixed layer is constituted of two ferromagnetic films A and B which are anti-ferromagnetically coupled to each other, and an anti-ferromagnetic coupling film for separating the two ferromagnetic films A and B from each other, and the single coercive force of the ferromagnetic film A is made to 200 (Oe) or more, and the single coercive force of the ferromagnetic film B is made to 20 (Oe) or less. As to the composition of the ferromagnetic film A and the ferromagnetic film B, when it is expressed by Co 100-Y Fe Y (atomic percent), 80≥Y≥40 for the ferromagnetic film A, and 20≥Y≥0 for the ferromagnetic film B, and the film materials in contact with the ferromagnetic film A are characterized by being Ru, Ta, NiFeCr, Cu, and NiFe. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了提供固定层磁矩对大的外部磁场稳定的结构，并且固定层的磁化方向可以通过室温下的磁场施加处理来控制，以及以提供磁场施加处理。解决方案：在磁阻效应型磁头中，固定层由两个相互反铁磁耦合的铁磁膜A和B构成，并且用于分离两个铁磁膜A的反铁磁耦合膜和B，并且将强磁性膜A的单一矫顽力设为200（Oe）以上，将强磁性膜B的单一矫顽力设为20（Oe）以下。关于铁磁性膜A和铁磁性膜B的组成，当以Co 100-Y Fe Y （原子百分比）表示时，80≥Y≥40 对于铁磁性膜A，强磁性膜B为20≥Y≥0，与铁磁性膜A接触的膜材料的特征在于Ru，Ta，NiFeCr，Cu，NiFe。版权所有（C）2005，JPO＆NCIPI

2. 发明专利

JP2003303406A Magneto-resistive effect head and magnetic head 审中-公开
标题翻译：磁电效应头和磁头
公开(公告)号：JP2003303406A
公开(公告)日：2003-10-24
申请号：JP2002104652
申请日：2002-04-08
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MORINAGA SATOSHI , NISHIOKA KOICHI , OTSU TAKAYOSHI , MIYAMOTO NORIFUMI , KOJIMA SHUICHI
IPC分类号： G11B5/39
CPC分类号： B82Y25/00 , B82Y10/00 , G01R33/093 , G01R33/098 , G11B5/3909 , G11B5/3912 , G11B5/3932 , G11B5/3967 , G11B2005/3996
摘要： PROBLEM TO BE SOLVED: To provide a magneto-resistive effect head having a larger sensitivity and higher stability compared with a conventional constitution provided with a magnetic domain control film having a magnetic field of equal intensity with respect to a narrow track, and a magnetic head.
SOLUTION: A layered film M1 adjacent to the magneto-resistive effect layered body of a GMR, CPP-CMR or TMR magnetic head is provided with at least two magnetic films 14 and 16 antiferromagnetically coupled to each other through a nonmagnetic film 15. A layered film M2 positioned above the free layer end area of the magneto-resistive effect layered body of the GMR magnetic head has a magnetic domain control structure provided with a magnetic layer antiferromagnetically coupled to a free layer 2 through a nonmagnetic film 27 made of material or an alloy similar to the above.
COPYRIGHT: (C)2004,JPO
摘要翻译：解决的问题：提供具有相对于窄轨具有相同强度的磁场的磁畴控制膜的常规结构，具有更大灵敏度和更高稳定性的磁阻效应头，以及磁头。解决方案：与GMR，CPP-CMR或TMR磁头的磁阻效应层叠体相邻的分层膜M1具有通过非磁性薄膜15彼此反铁磁耦合的至少两个磁性薄膜14和16 位于GMR磁头的磁阻效应层叠体的自由层端面上方的分层膜M2具有磁畴控制结构，该磁畴控制结构具有通过非磁性膜27反磁铁地耦合到自由层2的磁性层，该非磁性膜27由材料或类似于上述的合金。版权所有（C）2004，JPO

3. 发明专利

JP2003288707A Magnetoresistance effect head 审中-公开
标题翻译：磁阻效应头
公开(公告)号：JP2003288707A
公开(公告)日：2003-10-10
申请号：JP2002090182
申请日：2002-03-28
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MIYAMOTO NORIFUMI , YANAGISAWA YASUNOBU , MORINAGA SATOSHI , KOJIMA SHUICHI , NISHIOKA KOICHI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a magnetic head structure that can maintain required sensitivity, even for narrow tracks and make it compatible with suppression of the Barkhausen noise.
SOLUTION: This magnetoresistive effect head has magnetoresistive effect films (11 to 15), hard magnetic films 22a, 22b provided at their both ends to stabilize the magnetoresistance effect, and neighboring electrodes 23a, 23b to supply current for sensing. Electrodes 21a, 21b are provided at the boundary of the magnetoresistive effect films and the hard magnetic films. These electrode are made by a self-alignment process which uses the same mask as used, when making the magnetoresistance effect films. The hard magnetic films and magnetoresistance effect films (11 to 15) have no region in which they come into direct contact with.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了提供能够保持所需灵敏度的磁头结构，即使对于窄轨道也能够与抑制巴克豪森噪声兼容。解决方案：该磁阻效应头具有磁阻效应膜（11至15），设置在其两端的硬磁膜22a，22b以稳定磁阻效应，以及相邻的电极23a，23b以提供用于感测的电流。电极21a，21b设置在磁阻效应膜和硬磁膜的边界处。当制造磁阻效应膜时，这些电极通过使用与使用相同的掩模的自对准工艺制成。硬磁膜和磁阻效应膜（11〜15）没有与它们直接接触的区域。版权所有（C）2004，JPO

4. 发明专利

JP2002304710A GIANT MAGNETO-RESISTIVE HEAD CONSIDERING STABILITY OF OUTPUT 审中-公开
公开(公告)号：JP2002304710A
公开(公告)日：2002-10-18
申请号：JP2001195694
申请日：2001-06-28
申请人： HITACHI LTD
发明人： MORINAGA SATOSHI , ISHIKAWA CHIAKI , MIYAMOTO NORIFUMI , NISHIOKA KOICHI , YANAGISAWA YASUNOBU
IPC分类号： G01R33/09 , G11B5/39 , H01F10/16 , H01F10/30 , H01F10/32 , H01L43/08
摘要： PROBLEM TO BE SOLVED: To suppress the fluctuation of output waveform, read noise and Barkhausen noise (generically called as waveform fluctuation) by giving the shape condition of a magnetic domain control film generating a magnetic do main controlling magnetic field that a free magnetic layer becomes a single magnetic domain even in a spin-valve type giant magneto-resistive head having any width of the free magnetic layer. SOLUTION: A magnetic domain control running-on length Oh defined by a distance from the upper end part of the giant magneto-resistive stacked body to the tip of the magnetic domain control film, and an overmilling amount OM defined by the distance between the upper end part of a non-magnetic gap layer in contact with a lower shield layer and the lowermost part of a base film existing under the magnetic domain control film, are settled to have the ranges of Oh-16.8×OM

5. 发明专利

JP2002025013A MAGNETIC TUNNEL JUNCTION LAMINATED TYPE HEAD AND METHOD OF MANUFACTURE 失效
公开(公告)号：JP2002025013A
公开(公告)日：2002-01-25
申请号：JP2000203059
申请日：2000-06-30
申请人： HITACHI LTD
发明人： NISHIOKA KOICHI
IPC分类号： G01R33/09 , G11B5/39 , H01F10/12 , H01F10/16 , H01F10/26 , H01F10/32 , H01L43/08 , H01L43/12
摘要： PROBLEM TO BE SOLVED: To solve the problem that when abutted junction type magnetic domain control is used for a magnetic tunnel junction laminated sensor, if insulation between a permanent magnet layer and a tunnel junction is secured, magnetic domain controlling force is lowered and if the magnetic domain controlling force is heightened, insulation is deteriorated. SOLUTION: In a magnetic tunnel junction laminated type head having an anti-ferromagnetic layer, a fixed ferromagnetic layer adjacent to the anti- ferromagnetic layer and magnetically fixed by magnetization of the anti- ferromagnetic layer, a free ferromagnetic layer magnetically free from the magnetization of the anti-ferromagnetic layer, an insulating layer interposed between the ferromagnetic layers, a magnetic domain controlling layer for magnetic domain controlling the free ferromagnetic layer and a pair of electrodes for applying current to these layers, the magnetic domain controlling layer is formed between the free ferromagnetic layer and one of the electrodes. Thus, the magnetic tunnel junction laminated type sensor having excellent magnetic domain controlling force for the free ferromagnetic layer can be provided.

6. 发明专利

JPH07254115A MAGNETO-RESISTANCE EFFECT TYPE THIN-FILM MAGNETIC HEAD 失效
公开(公告)号：JPH07254115A
公开(公告)日：1995-10-03
申请号：JP4348094
申请日：1994-03-15
申请人： HITACHI LTD
发明人： NISHIOKA KOICHI , MITSUOKA KATSUYA , NARUSHIGE SHINJI , FUKUI HIROSHI
IPC分类号： G11B5/39
摘要： PURPOSE:To form a magneto-resistance effect type thin-film magnetic head having transverse bias films having a high resistance and high saturation magnetic flux density for improving sensitivity. CONSTITUTION:Laminated films of ferromagnetic films 12 and antiferromagnetic films 13 are used as the transverse bias films to a magneto-resistance effect film 14. The magnetization of the ferromagnetic films 12 is directed toward a direction orthogonal with a detecting current and the product of the saturation magnetic flux density Bs and the specific resistance rho is specified to [Bs.rhoF>=60(T$.muOMEGAcm)]. The films which attain [rhoAF>=1(OMEGAcm)] in the specific resistance rhoAF of the antiferromagnetic films are used. Then, the shunt ratio of the magneto-resistance effect film 14 is increased and the thin-film magnetic head having the high sensitivity and the stable bias characteristic is obtd.

7. 发明专利

JPH07254114A MAGNETIC HEAD 失效
公开(公告)号：JPH07254114A
公开(公告)日：1995-10-03
申请号：JP4347994
申请日：1994-03-15
申请人： HITACHI LTD
发明人： MITSUOKA KATSUYA , FUKUI HIROSHI , NISHIOKA KOICHI , KAMIO HIROSHI
IPC分类号： G11B5/39
摘要： PURPOSE:To form a magnetic head which is capable of preventing Barkhausen noises to be the cause for variation in characteristic of the magnetic head and noises and is effective particularly for a magneto-resistance effect type suppressing the degradation in head sensitivity even in a narrow track part. CONSTITUTION:A magnetic domain control layer 60 and an electrode film 70 are arranged on a magneto-resistance effect film 50. The magnetic domain control layer 60 is composed of >=2 layers of laminated films formed by successively laminating conductive nonmagnetic films 55 and magnetically soft ferromagnetic films 65. As a result, the generation of poles at the end of the magneto-resistance effect film is prevented and the degradation in the sensitivity is suppressed without affecting the magneto-resistance effect film in the magnetosensitive part. In addition, the generation of magnetic walls in the central part of the magneto-resistance effect film is suppressed by the vertical bias magnetic field generated from the magnetic domain control layer 60 and the Barkhausen noises caused by the irregular movement of the magnetic walls are suppressed.

8. 发明专利

JPH0562130A MAGNETO-RESISTANCE EFFECT TYPE MAGNETIC HEAD AND ITS MANUFACTURE 失效
公开(公告)号：JPH0562130A
公开(公告)日：1993-03-12
申请号：JP22434691
申请日：1991-09-04
申请人： HITACHI LTD
发明人： SOEYA SUSUMU , TADOKORO SHIGERU , IMAGAWA TAKAO , ASHIDA EIJI , FUYAMA MORIAKI , NARUSHIGE SHINJI , NISHIOKA KOICHI
IPC分类号： G11B5/00 , G11B5/012 , G11B5/31 , G11B5/39
摘要： PURPOSE:To suppress the occurrence of Barkhausen noise by providing a second magnetic domain controlling layer for magnetically applying a vertical bias across a magneto-resistance effect film. CONSTITUTION:A first magnetic domain controlling layer 30 for magnetically impressing a vertical bias across both end sections of a magneto-resistance effect film 40 is provided and a second magnetic domain controlling layer 45 for applying another vertical bias which is magnetically weaker than the above-mentioned bias across the central part of the film 40 is provided on or below the film 40. Accordingly, even when some pinholes or unevenness exists in the film 40 or a step is produced in the layer 30, the occurrence of Barkhausen noise can be suppressed, because the weakly coupled film 45 formed adjacent to the central part of the film 40 prevents the generation of magnetic poles. In addition, since the vertical bias applied by the layer 45 is weaker than that applied by the layer 30, an increase in anisotropic magnetic field is suppressed to a negligible level and the reproduction sensitivity of a magneto- resistance effect element is not affected by the increase even a magnetism sensitive section constituting the central part of the film 40 directly comes into contact with the layer 45.

9. 发明专利

JPH02203410A THIN-FILM MAGNETIC HEAD 失效
公开(公告)号：JPH02203410A
公开(公告)日：1990-08-13
申请号：JP2071789
申请日：1989-02-01
申请人： HITACHI LTD
发明人： ARAI REIKO , NARUSHIGE SHINJI , MITSUOKA KATSUYA , IMAGAWA TAKAO , SANO MASAAKI , NISHIOKA KOICHI , SUDO SHUJI , KOYANAGI HIROAKI , KOBAYASHI TETSUO
IPC分类号： G11B5/31
摘要： PURPOSE:To prevent the lowering of a magnetic permeability when a large anisotropic stress is applied on a magnetic core and the deterioration in the electromagnetic conversion characteristics of the magnetic head by forming an upper magnetic film and a lower magnetic film to a circular shape. CONSTITUTION:This magnetic head consists of the lower magnetic film 2 formed on an Al2O3 film 12 of a substrate 1 and the upper magnetic film 3 which is formed on the lower magnetic film 2 in such a manner as to bring one end 31 into contact with one end 21 of the lower magnetic film 2 and to dispose the other end 32 to face the other end of the lower magnetic film 22 via a magnetic gap G and constitutes a magnetic circuit having a magnetic gap S in a part together with the lower magnetic film 2. The stress acting on the films is determined by the shape of the magnetic core and since the region in the front end part of the core is sensitive to recording and reproducing characteristics, the lower and upper magnetic materials 2, 3 are formed to the circular shape so as to relieve the stress in the front end part of the core. The magnetic anisotropy of the upper magnetic film 3 and the lower magnetic film 2 of the thin-film magnetic head is diminished in this way and the stable electromagnetic conversion characteristics which obviates the generation of the reproducing waveform distortions are obtd.

10. 发明专利

JPH01282713A THIN-FILM MAGNETIC HEAD AND MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH01282713A
公开(公告)日：1989-11-14
申请号：JP27927688
申请日：1988-11-07
申请人： HITACHI LTD
发明人： SANO MASAAKI , IMAGAWA TAKAO , NISHIOKA KOICHI , NARUSHIGE SHINJI , HANAZONO MASANOBU , ONISHI TAKASHI , YOSHIDA TOSHIHIRO
IPC分类号： G11B5/31 , G11B5/127 , H01F10/12 , H01F10/13 , H01F10/16
摘要： PURPOSE:To obtain the thin-film magnetic head for high density recording having excellent performance by using a specific material having a high saturation magnetic flux density as the core of the thin-film magnetic head. CONSTITUTION:This head has a pair of magnetic films 2a, 2b disposed to face each above and below a nonmagnetic substrate 1 and the films 2a, 2b are formed of the thin films of a quaternary amorphous alloy which consists essentially of cobalt and contains hafnium, tantalum and palladium as additive components. The films 2a, 2b are made of the material which has the high saturation magnetic flux density, nearly zero magnetorestriction constant and excellent corrosion resistance. The thin-film magnetic head which has the excellent writing characteristic as a magnetic head, exhibits a high value of magnetic permeability, has an excellent read-out characteristic and can deal sufficiently with the higher recording density is thereby obtd.

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