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61. 发明专利

JPH0896329A MAGNETORESISTIVE EFFECT HEAD 失效
公开(公告)号：JPH0896329A
公开(公告)日：1996-04-12
申请号：JP23278394
申请日：1994-09-28
申请人： HITACHI LTD
发明人： YUHITO ISAMU , KAGAWA MASAYOSHI , NISHIOKA KOICHI
IPC分类号： G11B5/39
摘要： PURPOSE: To provide a magnetoresistive effect head with which Barkhausen noise is suppressed without degrading reproduced output by determining the saturation magnetic flux density of hard magnetic film and positional relation between film thicknesses and electrode. CONSTITUTION: The distance (d) between the end of noise suppressing film 8 and the end of the electrode 9 of the magnetoresistive effect head formed by using a hard magnetic film for suppressing the Barkhausen noise is set at >=1/20 of the saturation magnetic flux density Bs × film thickness (t) of the hard magnetic film. As a result, the Barkhausen noise in suppressed without degrading the bias effect by the reproduced output. The noise suppression by the hard magnetic film is effective for both of magnetoresistance effect film and bias film.

62. 发明专利

JPH07249207A MAGNETO-RESISTANCE EFFECT TYPE MAGNETIC HEAD 失效
公开(公告)号：JPH07249207A
公开(公告)日：1995-09-26
申请号：JP4133894
申请日：1994-03-11
申请人： HITACHI LTD
发明人： NISHIOKA KOICHI , KAMIO HIROSHI , MITSUOKA KATSUYA
IPC分类号： G11B5/39
摘要： PURPOSE:To increase the shunt ratio of an MR head and to improve its sensitivity by using an alloy film composed of three elements, Co, Ni and Fe, and a fourth additive element as soft bias film. CONSTITUTION:Two kinds of targets having compsns. of Co76Nil4Fe10 and Co18Ni70FelO are prepd. as targets. A small piece of the fourth element (Rh, Ru, Ni, Ta, Zr) sized in 10mmX10mmX1m is stuck to these targets and the soft bias film is formed by an RF magnetron sputtering method. A stencil-like photoresist is then formed in the magnetosensitive region on the soft bias film 13 and a Ta10nm/Au100nm film 15 is formed thereon by sputtering, thereafter, the photoresist and Ta/Au film 15 on the magnetosensitive region are removed by lift-off. A Ta/Au electrode 15 which is an electrode conductor is thereby formed. At this time, the shunt ratio beta is improved by 20% and the head sensitivity is improved by 20% as compared with conventional soft bias method.

63. 发明专利

JPH06267033A MANUFACTURE OF MAGNETORESISTANCE EFFECT TYPE HEAD AND MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH06267033A
公开(公告)日：1994-09-22
申请号：JP5538893
申请日：1993-03-16
申请人： HITACHI LTD
发明人： WATANABE KATSURO , IMAGAWA TAKAO , SOEYA SUSUMU , TADOKORO SHIGERU , NISHIOKA KOICHI
IPC分类号： G11B5/39
摘要： PURPOSE:To obtain a head with a higher reproduction output and higher stability by forming a magnetoresistance effect film and a non magnetic conductive thin film continuously in vacuum in the manufacture of a magnetoresistance effect type head. CONSTITUTION:An insulation layer made of alumina or the like is formed in a thin film, a Sendust is formed on a non-magnetic substrate 10 subjected to a precision grounding by sputtering as lower shield film 17 to be patternized after a specified shape by a photolithography art and an alumina insulation film 19 is formed thereon. FeMn is formed in a film as magnetic domain control film 12 to be patternized after a specified shape. At the point, the magnetic domain control film 12 is removed at the central part of a magnetic domain resistance effect element and a part leaving the magnetic domain control film 12 undergoes a switched connection to a magnetoresistance effect film 13 to make a structure for controlling a magnetic domain structure thereof 13. Then, a process of form ing the effect film 13 and a process of forming a non-magnetic electroconductive thin film 11 are performed continuously in vacuum. This enables the formation of the magnetoresistance effect element part without containing oxygen in a production process thereby achieving the production of a head with higher stability.

64. 发明专利

JPH06103533A THIN-FILM MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPH06103533A
公开(公告)日：1994-04-15
申请号：JP24662792
申请日：1992-09-16
申请人： HITACHI LTD
发明人： MORIJIRI MAKOTO , YUHITO ISAMU , NISHIOKA KOICHI , OWADA KATSUNORI , KOBAYASHI TETSUO , NARUSHIGE SHINJI , TADOKORO SHIGERU
IPC分类号： G11B5/39
摘要： PURPOSE:To decrease the noise to be generated and to prevent the shorting between electrode conductor layers by lowering the resistance of the electrode conductor layers for passing current to the magneto-resistance effect layer of the thin-film magnetic head. CONSTITUTION:The electrode conductor layers 2 are formed with at least >=3 layers of films and the specific resistance of the second layer electrode conductor layer 22 is set at

65. 发明专利

JPH04192105A THIN-FILM MAGNETIC HEAD AND MAGNETIC DISK DEVICE MOUNTED THEREWITH 失效
公开(公告)号：JPH04192105A
公开(公告)日：1992-07-10
申请号：JP32078490
申请日：1990-11-27
申请人： HITACHI LTD
发明人： FUYAMA MORIAKI , ASHIDA EIJI , KAWABE TAKASHI , NISHIOKA KOICHI , YAMAZAKI HIDEKI , OKAI TETSUYA , SUGITA KEN , NARUSHIGE SHINJI , FUKUI HIROSHI , KUWAZUKA SHUNICHIRO
IPC分类号： G11B5/31
摘要： PURPOSE:To improve the accuracy of a track width by forming a recessed part in a substrate and forming a coil of a 1st layer therein to lower the element height at the time of working the track width. CONSTITUTION:A thin insulating film 2 is formed on a substrate 1 to be used as a slider. This insulating film 2 is formed by using Al2O3, etc., and the recessed part is formed in this film 2. The recessed part formed to the shape capable of filling the back gap part which is the juncture between the winding part of the coil exclusive of the magnetic gap and the magnetic core. An ion milling method using a photoresist film as a mask and using gaseous CF4 and CHF3 is used as the method for forming the recessed part. The taper angle is controlled at 40+ or -10 deg. in terms of magnetic field strength in the case of formation of this recessed part. The taper angle of the recessed part is controlled by the taper angle of the photoresist film which is a mask material.

66. 发明专利

JPH04129010A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPH04129010A
公开(公告)日：1992-04-30
申请号：JP24700590
申请日：1990-09-19
申请人： HITACHI LTD
发明人： NISHIOKA KOICHI , SUDO SHUJI , MITSUOKA KATSUYA , NARUSHIGE SHINJI , KOBAYASHI TETSUO
IPC分类号： G11B5/31
摘要： PURPOSE:To eliminate a problem that a reproduced waveform is distorted or noise occurs after recording by reducing the reproduced output in accordance with the rise of an operating frequency by the structure where magnetization of a magnetic core is practically refluxed in a plane orthogonal to a magnetic path. CONSTITUTION:The front end of a magnetic core 1 has a refluxing magnetic domain structure in a plane orthogonal to a magnetic path 4. Since magnetization is refluxed in the plane orthogonal to the magnetic path 4, the magnetic core is magnetized by magnetization rotation because magnetization in any magnetic domain is orthogonal to the magnetic field from a medium, and a magnetic wall is not moved. Therefore, the discontinuous magnetization change does not occur and magnetization is easily operated at a high speed, and consequently, the reproduced waveform distortion is difficult to occur even if the transfer speed is increased, and the reduction of the reproduced output is reduced. Thus, the high frequency permeability of the magnetic core is increased, and a large reproduced output is obtained, and waveform distortion and noise after recording are difficult to occur.

67. 发明专利

JPH046608A THIN FILM MAGNETIC HEAD AND MAGNETIC DISK DEVICE WITH THE THIN FILM MAGNETIC HEAD MOUNTED THEREON 失效
公开(公告)号：JPH046608A
公开(公告)日：1992-01-10
申请号：JP10761190
申请日：1990-04-25
申请人： HITACHI LTD
发明人： SUDO SHUJI , ARAI REIKO , NISHIOKA KOICHI , FUNYU MASAO , KUMAGAI AKIRA , SANO MASAAKI , KAWABE TAKASHI , FUYAMA MORIAKI , MITSUOKA KATSUYA , NARUSHIGE SHINJI , YOSHIDA TOSHIHIRO , KOBAYASHI TETSUO
IPC分类号： G11B5/31
摘要： PURPOSE:To eliminate a reproduction waveform distortion and to improve the S/N at a high frequency by dividing a magnetic core into a tip part and a rear part and forming them with a multi-layer magnetic film comprising two layers or over of alternate magnetic film and nonmagnetic film laminate configuration. CONSTITUTION:The thin film magnetic head is provided with a lower magnetic core comprising a magnetic film (Co-Ta-Zr) 2 and a nonmagnetic film (Al2O3) 3 on a base 1, and with an upper magnetic core tip part comprising a magnetic gap (Al2O3) 4, a lower layer insulation film (resist) 5, a magnetic film (Co-Ta-Zr) 6 and a nonmagnetic film (Al2O3) 7. Moreover, the thin film magnetic head is provided with a protection film (Al2O3) 8, an upper magnetic core rear part comprising a magnetic film (Co-Ta-Zr) 10 and a nonmagnetic film (Al2O3) 9, with a coil 12, an upper layer insulation film 13 and an element protection film 14. The upper magnetic core tip part and the upper magnetic core rear part are connected through a contact hole 11 provided to the protection film 8 and they form a magnetic circuit with the lower magnetic core. Thus, single magnetic domains are employed for the structure of the magnetic domain of the magnetic core and the S/N at a high frequency band is improved.

68. 发明专利

JPH03130910A THIN FILM MAGNETIC HEAD AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH03130910A
公开(公告)日：1991-06-04
申请号：JP18245390
申请日：1990-07-10
申请人： HITACHI LTD
发明人： IMAGAWA TAKAO , SANO MASAAKI , MITSUOKA KATSUYA , NISHIOKA KOICHI , NARUSHIGE SHINJI , KOBAYASHI TETSUO
IPC分类号： G11B5/31
摘要： PURPOSE:To enlarge a reproducing output and to improve a recording property by forming the axis of easy magnetization orthogonally with the magnetic path direction of a magnetic head and rotating the direction of the axis of easy magnetization by an anisotropic magnetic field reduction processing for one of upper and lower magnetic cores at least. CONSTITUTION:A lower magnetic core 1 is laminated on a ceramic base 8, an organic insulating layer 4 is laminated on the lower magnetic core 1 and an upper magnetic core 2 is laminated on the layer 4. The upper and lower magnetic cores 2 and 1 are joined at one end and at the other end of the both cores 2 and 1, a magnetic gap 3 is formed. In the joining part of the both cores 2 and 1, a coil 6 is formed to be wound around plural times. One of the both cores 2 and 1 at least is formed by a non-crystalline material including more than 80at% Co or a crystalline material including more than 20at% Co, and the axis of easy magnetization is made orthogonal to the magnetic path direction of the magnetic head. Concerning the thermal history of this thin film magnetic head, by leaving it in non-magnetic field at about 200 deg.C for about two hours, an output decrease rate is made less than 10% in comparison before left standing.

69. 发明专利

JPH02105301A REPRODUCTION METHOD USING THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPH02105301A
公开(公告)日：1990-04-17
申请号：JP25720088
申请日：1988-10-14
申请人： HITACHI LTD
发明人： NISHIOKA KOICHI , SUDO SHUJI , SANO MASAAKI , MITSUOKA KATSUYA , IMAGAWA TAKAO , NARUSHIGE SHINJI
IPC分类号： G11B5/31 , G11B5/02 , G11B5/03 , G11B5/455
摘要： PURPOSE:To obtain a large output at reproduction by reproducing the information on a medium in a state where a current is supplied to a coil. CONSTITUTION:An element contains a slip-shaped magnetic core 1 and a coil 2, and the inductance of the coil 2 is measured in a state where a DC bias current is supplied to the coil 2. Thus the magnetic permeability of the core 1 is obtained. The core 1 uses a 'Permalloy(R)' having the uniaxial anisotropy in the (x) direction. Thus the magnetic permeability of the core 1 is increased by supplying a proper level of DC bias current to the coil 2 of a magnetic head. then a large output is obtained at reproduction. This method is applied to a head having a multi-layer magnetic core to obtain a thin film magnetic head which excels in the high frequency characteristics.

70. 发明专利

JPH01319109A THIN FILM MAGNETIC HEAD AND ITS MANUFACTURE 失效
公开(公告)号：JPH01319109A
公开(公告)日：1989-12-25
申请号：JP15114688
申请日：1988-06-21
申请人： HITACHI LTD
发明人： IMAGAWA TAKAO , SUDO SHUJI , SANO MASAAKI , NISHIOKA KOICHI , KUMAGAI AKIRA , MITSUOKA KATSUYA , YAMAZAKI HIDEKI , ARAI REIKO , NARUSHIGE SHINJI , KOBAYASHI TETSUO
IPC分类号： G11B5/31 , G11B5/187
摘要： PURPOSE:To obtain a thin film magnetic head with a satisfactory reproducing characteristic by controlling an aspect ratio in the pillar shape structure of a film. CONSTITUTION:The thin film magnetic head equips a lower magnetic film 2 on a substrate 1, an upper magnetic film 6, whose one edge is faced to the film 2 through a magnetic gap 3 and other edge is directly contacted to the lower magnetic film 2, on the film 2, a coil 4 to wind to a contact part between the upper and lower magnetic films 6 and 2 and a layer 5 to insulate the coil 4 and the upper and lower magnetic films 6 and 2. The aspect ratio for pillar- shaped crystal 7 of cross section organization in one of the upper and lower magnetic films 6 and 2, at least, is caused to be 1-4. Thus, the thin film magnetic head, whose reproducing characteristic is especially satisfactory, can be obtained.

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