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1. 发明专利

JP2003178405A SPIN VALVE TYPE MAGNETIC HEAD AND ITS MANUFACTURING METHOD 审中-公开
公开(公告)号：JP2003178405A
公开(公告)日：2003-06-27
申请号：JP2002305285
申请日：2002-10-21
申请人： HITACHI LTD
发明人： NISHIOKA KOICHI , KAMIO HIROSHI , SHIGEMATSU KEISHI , IMAGAWA TAKAO , NARUSHIGE SHINJI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a spin valve type magnetic head wherein no characteristic changes occur within an operation temperature range. SOLUTION: The antiferromagnetic layer of the fixed layer of a spin valve is made of an alloy which contains Cr, Mn, Pt, a magnetic field is kept to be applied which is enough to magnetically saturate the fixed layer in a magnetic gap depth direction at a temperature lower than the blocking temperature (Tb) of the antiferromagnetic layer, and after the fixed layer is cooled in the magnetic field, a minimum magnetic field enough to saturate the magnetization of the free layer of the spin valve is kept to be applied in this direction at a temperature lower than Tb. A coupling magnetic field He of one-direction anisotropy of the fixed layer is set to H e (Tmax)≥60+100/ hMR[Oe] where a highest process temperature is T max and an element height is hMR (μm), an antiferromagnetic layer composition is (Cr 100-x Mn x ) 100-y Pt y , 2≤y, 40≤x≤70, columnar crystal powders are formed, an average crystal particle size of the antiferromagnetic layer is set to 2.7×10 -18 cm 3 or higher by film thickness control, (110) of bct is set parallel to a film surface, a long axis is set within the film surface, and magnetization is fixed in a desired direction up to a fixed layer component having Tb of T max or higher. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2003045001A Magnetic recording device and magnetic head 有权
标题翻译：磁记录装置和磁头
公开(公告)号：JP2003045001A
公开(公告)日：2003-02-14
申请号：JP2001226991
申请日：2001-07-27
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： OTSU TAKAYOSHI , NARUSHIGE SHINJI
IPC分类号： G11B5/667 , G11B5/00 , G11B5/02 , G11B5/03 , G11B5/127 , G11B5/39
CPC分类号： G11B5/00 , G11B5/03 , G11B5/1278 , G11B5/3967 , G11B2005/001 , G11B2005/0016
摘要： PROBLEM TO BE SOLVED: To solve the problem of magnetic domain formation in a perpendicular magnetization medium provided with the primary film of a soft magnetic film, which causes a reproducing head to detect a magnetic flux from a magnetic wall as nose and misunderstand it as an original signal.
SOLUTION: The prevention of magnetic domain formation as the problem of a perpendicular magnetization medium provided with the primary film of a soft magnetic film is achieved by carrying put proper magnetic domain control for the soft magnetic film. One method is to carry out the magnetic domain control of the soft magnetic film by applying a magnetic field to the medium from the outside, and the method is to install a mechanism for generating a magnetic field to carry out the magnetic domain control of the soft magnetic film of the medium in the magnetic head.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：为了解决设置有软磁膜的初级膜的垂直磁化介质中的磁畴形成的问题，这导致再现头从磁性壁作为鼻子检测磁通，并将其误解为原始信号解决方案：通过对软磁膜进行适当的磁畴控制，可以实现防磁磁场形成作为提供软磁膜初级膜的垂直磁化介质的问题。一种方法是通过从外部向介质施加磁场来执行软磁膜的磁畴控制，并且该方法是安装用于产生磁场的机构，以执行软的磁畴控制介质在磁头中的磁性膜。

3. 发明专利

JPH10308004A SPIN VALVE TYPE MAGNETIC HEAD AND PRODUCTION OF SPIN VALVE TYPE MAGNETIC HEAD 失效
公开(公告)号：JPH10308004A
公开(公告)日：1998-11-17
申请号：JP12801197
申请日：1997-05-01
申请人： HITACHI LTD
发明人： NISHIOKA KOICHI , KAMIO HIROSHI , SHIGEMATSU KEISHI , IMAGAWA TAKAO , NARUSHIGE SHINJI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a spin valve type magnetic head which is free from a characteristic change in an operating temp. range. SOLUTION: The antiferromagnetic layer of a fixing layer of a spin valve consists of an alloy contg. Cr, Mn and Pt. A magnetic field sufficient for magnetic saturation of the fixing layer is impressed and held in the depth direction of a magnetic gap at a temp. lower than the blocking temp. (Tb) of the antiferromagnetic layer. The min. magnetic field sufficient for saturating the magnetization of the free layer of the spin valve in a track width direction is impressed and held on the layer in its direction at the temp. lower than Tb after cooling in the magnetic field. The coupling magnetic field He in the unidirectional anisotropy of the fixing layer is set at Hc (Tmax)>=100/hMR[Oe] where the process max. temp. is defined as Tmax and the element height as hMR. The compsn. of the antiferromagnetic layer is composed of (Cr100-x Mnx )100-x Ptv , where 2 =2.7×10 cm by film thickness control. The (110) of bct is made parallel with the film plane so as to have a major axis within the film plane. The fixation of the magnetization in a desired direction down to the components of the fixing layer having Tb of Tmax or above is made possible.

4. 发明专利

JP2585400B2 失效
公开(公告)号：JP2585400B2
公开(公告)日：1997-02-26
申请号：JP28366988
申请日：1988-11-11
申请人： HITACHI LTD
发明人： HANAZONO MASANOBU , NARUSHIGE SHINJI , SUGITA KEN , FUKUI HIROSHI , FUKUOKA HIROTSUGU , AOI MOTOI , KATSUMOTO MASAYUKI , OGAWA TAKUJI , NARUSE ATSUSHI , SAITO SUKEO
IPC分类号： C09D5/23 , C09D7/12 , G11B5/012 , G11B5/02 , G11B5/09 , G11B5/31 , G11B5/82

5. 发明专利

JPH06150247A MAGNETIC HEAD AND MAGNETIC RECORDING APPARATUS 失效
公开(公告)号：JPH06150247A
公开(公告)日：1994-05-31
申请号：JP29322392
申请日：1992-10-30
申请人： HITACHI LTD
发明人： OTSU TAKAYOSHI , KUSHIDA NOBUMASA , HONMA HISAYASU , TAKAGI MASAYUKI , NARUSHIGE SHINJI
IPC分类号： G11B5/187 , G11B5/265 , G11B5/31 , G11B5/39
摘要： PURPOSE:To determine an effective track width of a recording head and a reproduction head so that good recording and reproduction characteristics in a higher track density can be realized with a low S/N in a magnetic head in which the reocording head and reproduction head are separated. CONSTITUTION:In a separation type head consisting of an induction type recording head (upper and lower magnetic films 1, 3, magnetic gap 2) and an MR type reproduction head (upper and lower shields 9, 8, electrode 4, MR element 5), a magnetic recording effective track width of the recording head is a little shorter than optical track width Twwopt due to magnetic saturation of core at both sides of the track. The magnetic reproduction effetive track width of the reproduction head is slightly longer or slightly shorter than optical track width Twwopt. Peak shift generated in the magnetically saturated region can be avoided and good S/N can be obtained by making the effective track width of the reproduction head a little shorter than the effective track width of the recording head.

6. 发明专利

JPH0628628A MAGNETIC RECORDING/REPRODUCING DEVICE MOUNTING THIN FILM HEAD 失效
公开(公告)号：JPH0628628A
公开(公告)日：1994-02-04
申请号：JP18238092
申请日：1992-07-09
申请人： HITACHI LTD
发明人： TANABE MASANORI , NARUSHIGE SHINJI , SHIIKI KAZUO , SUDA MITSUO , TAKAGI MASAYUKI , SHIRAISHI KAZUHISA , AMANO HIDEAKI
IPC分类号： G11B5/00 , G11B5/012 , G11B5/31 , G11B5/39 , G11B5/65 , G11B5/82 , G11B5/74
摘要： PURPOSE:To provide the head of a high recording magnetic field gradient in a high recording magnetic field with the tip part of a magnetic core difficult to be saturated even when there is a variance in gap depths. CONSTITUTION:The magnetic gap length GL of a recording head (constituted of an upper part magnetic core 121 and a lower part magnetic core 122) is made wider than minimum magnetization bit length fc recorded on a magnetic recording medium 18. Thus, in both cases where a gap depth Gd is deep and shallow, an area where a magnetic saturation is first started when increasing a starting magnetic force is moved away from the tip part of the upper part core 121 to an inclined part and a head magnetic field Hmax and its gradient dHx/dx are heightened. Further, an MR head is used for a reproducing head, a normal bias current is supplied to an MR element only during reproducing data, a smaller bias current is supplied during reproducing the other ID signal and thus, the generation of heat is prevented.

7. 发明专利

JPH05298610A 失效
公开(公告)号：JPH05298610A
公开(公告)日：1993-11-12
申请号：JP10131392
申请日：1992-04-21
申请人： HITACHI LTD
发明人： SANO MASAAKI , KOMURO MATAHIRO , FUNYU MASAO , MITSUOKA KATSUYA , OHASHI TAKEYA , NARUSHIGE SHINJI , KAGAWA MASAYOSHI , KOBAYASHI TETSUO , KOBAYASHI SHIRO
IPC分类号： G11B5/127 , C22C19/07 , G11B5/31 , H01F10/12
摘要： PURPOSE:To provide the high-recording density magnetic disk device mounted with a recording/reproducing sepn. type magnetic head including a magnetic recording head using magnetic films having a high saturation magnetic flux density, low coercive force and excellent corrosion to a soln. to be used at the time of production, etc. CONSTITUTION:This high-recording density magnetic disk device is mounted with the recording/reproducing sepn. type magnetic head including the magnetic recording head 103 constituted by using the magnetic thin films consisting of 40 to 70at.% Co, 10 to 30at.% Ni, 15 to 40at.% Fe and 1 to 10at.% Cu for an upper magnetic core 112 and a lower magnetic core 113 and a reproducing head 115. The device has the high saturation magnetic flux density, the low coercive force and the good corrosion resistance and heat resistance.

8. 发明专利

JPH04285713A MAGNETO-RESISTANCE EFFECT TYPE HEAD AND PRODUCTION THEREOF 失效
公开(公告)号：JPH04285713A
公开(公告)日：1992-10-09
申请号：JP4981191
申请日：1991-03-14
申请人： HITACHI LTD
发明人： TADOKORO SHIGERU , NARUSHIGE SHINJI , KOYANAGI HIROAKI , KOBAYASHI TETSUO
IPC分类号： G11B5/31 , G11B5/39
摘要： PURPOSE:To stably and easily obtain the vertical bias magnetic fields for suppressing the generation of magnetic walls in the magneto-resistance effect film of the magneto-resistance effect type magnetic head by forming a magnetic domain control layer only on the lower side at the end of the magneto-resistance effect film. CONSTITUTION:The magnetic domain control layer consisting of a 1st ferromagnetic film 301, a diaferromagnetic film 302 and a 2nd ferromagnetic film 303 is disposed on the lower side at the end of the magneto-resistance effect film and the uppermost film is formed of the ferromagnetic film 303. The spin arrangement of the diaferromagnetic film 302 is transmitted via the 2nd ferromagnetic film 303 to the magneto-resistance effect film and, therefore, the stable vertical bias magnetic fields are obtd. without being affected by the degree of contamination on the surface of the ferromagnetic film 303.

9. 发明专利

JPH0443989B2 失效
公开(公告)号：JPH0443989B2
公开(公告)日：1992-07-20
申请号：JP19987084
申请日：1984-09-25
申请人： HITACHI LTD
发明人： SANO MASAAKI , MITSUOKA KATSUYA , MORIJIRI MAKOTO , NARUSHIGE SHINJI , HANAZONO MASANOBU , YOSHIDA TOSHIHIRO
IPC分类号： C22C19/07 , C25D3/56 , C25D7/00 , G11B5/31 , H01F10/16 , H01F41/26

10. 发明专利

JPH03268214A THIN-FILM MAGNETIC HEAD CONTROLLED IN NOISE AFTER WRITING 失效
公开(公告)号：JPH03268214A
公开(公告)日：1991-11-28
申请号：JP6422690
申请日：1990-03-16
申请人： HITACHI LTD
发明人： SANO MASAAKI , MITSUOKA KATSUYA , NISHIOKA KOICHI , NARUSHIGE SHINJI , SUGITA KEN , TANABE MASANORI , FUKUI HIROSHI , KOBAYASHI TETSUO , YOSHIDA TOSHIHIRO , SAITO SUKEO , KAWAKAMI KANJI , TSUJI GIICHI , NAKAKOSHI KAZUO , HAYASHI MASAAKI
IPC分类号： G11B5/31
摘要： PURPOSE:To decrease the generation of pseudo noises and to prevent the error of a device by controlling the max. value of the noises after recording so as to attain

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