专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2003208706A MAGNETIC HEAD 审中-公开
公开(公告)号：JP2003208706A
公开(公告)日：2003-07-25
申请号：JP2002340280
申请日：2002-11-25
申请人： HITACHI LTD
发明人： KOBAYASHI TOSHIO , KITADA MASAHIRO , YUHITO ISAMU , SHIMIZU NOBORU , KOYAMA NAOKI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To prevent generation of a Barkhausen noise, to suppress the formation of steps on a magnetoresistive effect element layer and a recording head placed thereon, and the concentration of stress, and to prevent the breaking of a thin magneto-resistance layer by the steps of a hard magnetic substance layer. SOLUTION: The magnetoresistive effect reproducing head is provided with a magnetoresistive effect film 3 made of a ferromagnetic material thin film, which has a central sensing region 102 and an end magnetic domain control region 103, and a hard magnetic substance layer 1 made of a hard magnetic material thin film, which is overlapped with and brought into direct contact with the end magnetic domain control region 103. In order to maintain the central sensing region 102 of the magnetoresistive effect film 3 in a single magnetic domain state, a longitudinal magnetic bias is generated by a magnetic field and ferromagnetic exchange coupling. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2002329302A MAGNETIC RECORDING/REPRODUCING HEAD 审中-公开
公开(公告)号：JP2002329302A
公开(公告)日：2002-11-15
申请号：JP2002125549
申请日：2002-04-26
申请人： HITACHI LTD
发明人： KAWABE TAKASHI , NARUSHIGE SHINJI , IWAKURA TADAYUKI , KOYAMA NAOKI , OKAI TETSUYA
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a thin film magnetic head having excellent recording performance such as high recording magnetic field or high recording efficiency in a narrow track width of 2 μm or lower, and capable of highly accurately forming a narrow magnetic pole pattern. SOLUTION: An upper magnetic core to decide a recording track width is constituted of two parts, i.e., a first part 110 exposed on a medium opposite surface, and a second part 111 not exposed on the medium opposite surface, but larger in witch and film thickness than the first part 110, a tip of which is arranged between the surface opposite to the medium and a point 112 of throat height = 0.

3. 发明专利

JP2002329301A MAGNETIC RECORDING/REPRODUCING HEAD 审中-公开
公开(公告)号：JP2002329301A
公开(公告)日：2002-11-15
申请号：JP2002125548
申请日：2002-04-26
申请人： HITACHI LTD
发明人： KAWABE TAKASHI , NARUSHIGE SHINJI , IWAKURA TADAYUKI , KOYAMA NAOKI , OKAI TETSUYA
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a thin film magnetic head having excellent recording performances such as high recording magnetic field or high recording efficiency in a narrow track width of 2 μm or lower, and capable of highly accurately forming a narrow magnetic pole pattern. SOLUTION: An upper magnetic core to determine a recording track width is constituted of two parts, i.e., a first part 110 exposed on a medium opposite surface, and a second part 111 not exposed on the medium opposite surface, but larger in witch and film thickness than the first part 110, a tip of which is arranged between the surface opposite to the medium and a point 112 of throat height = 0.

4. 发明专利

JP2000090420A MAGNETO-RESISTIVE HEAD AND MAGNETIC DISK DEVICE 失效
公开(公告)号：JP2000090420A
公开(公告)日：2000-03-31
申请号：JP29180599
申请日：1999-10-14
申请人： HITACHI LTD
发明人： YUHITO ISAMU , MORIWAKI HIDETOSHI , KOYAMA NAOKI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To improve corrosion resistance by forming electrodes for signal detection of Nb, Ta, Cr or alloys mainly composed of these materials. SOLUTION: A lower shielding film 2 consisting of NiFe and a first gas gap film 3 consisting of SiO2 are laminated on a substrate 1 formed by using an Al2O3.Tic plate. In succession, a magneto-resistive film 4 consisting of an NiFe alloy thin film is deposited thereon in such a manner that its film thickness attains 0.04 μm. This film is than patterned to a rectangular shape by a photolithography technique. An Nb film is thereafter deposited and is patterned, by which electrodes 5a, 5b for signal detection are formed. Low- electric resistance films 6 of Cu are formed on the electrodes 5a, 5b for signal detection. Second gap layers (SiO2) and soft film upper shielding films (NiFe) for impressing bias magnetic fields are formed on these patterns. The materials exposed on the sliding surfaces with the recording medium turn to Al2O3.Tic, SiO2, NiFe and Nb having the high corrosion resistance. The probability that these materials corrode during use is extremely lessened.

5. 发明专利

JPH11328632A MAGNETIC HEAD 失效
公开(公告)号：JPH11328632A
公开(公告)日：1999-11-30
申请号：JP11181399
申请日：1999-04-20
申请人： HITACHI LTD
发明人： KOYAMA NAOKI , TAKANO KOJI , MORIWAKI HIDETOSHI , SHIIKI KAZUO
IPC分类号： G11B5/31 , G11B5/265 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To reduce a record blurring at a recording head by making sizes of an upper and a lower parts of a shared magnetic layer agree with breadths necessary for a shield layer and a magnetic pole respectively. SOLUTION: When an upper and a lower parts of a shared magnetic layer have different specific magnetic permeabilities and saturation magnetic flux densities, with a recording magnetic pole being layered on a magnetoresistance effect type reproduction head, the reproduction head has a magnetoresistance effect element 4 of a thin film of Permalloy via an insulating layer between magnetic shield layers 2 and 6 serving also as magnetic poles. A lower magnetic pole 19 of a recording head is formed on the upper magnetic shield layer 6. At this time, the magnetic shield is formed of Permalloy of a film thickness of 0.7 μm and the magnetic pole 19 is formed of CoTaZr of a saturation magnetic flux density of 1.3T. Thereafter, a coil is formed via an insulating layer 8, onto which an upper magnetic pole 7 is formed. The lower magnetic shield layer 2, upper magnetic shield layer 6, lower magnetic pole 19 and upper magnetic pole 7 have sizes in a breadthwise direction of tracks of 100 μm, 90 μm, 8 μm and 6 μm respectively.

6. 发明专利

JPH11120515A THIN FILM MAGNETIC HEAD AND MAGNETIC RECORDER 失效
公开(公告)号：JPH11120515A
公开(公告)日：1999-04-30
申请号：JP28491797
申请日：1997-10-17
申请人： HITACHI LTD
发明人： YOSHIDA AKIRA , KOJIMA YASUO , KARAKAMA YOSHIAKI , KOYAMA NAOKI
IPC分类号： G11B5/31 , G11B5/33
摘要： PROBLEM TO BE SOLVED: To reduce impedance of wiring of an extraction line/wiring integrated type suspension and to improve a transmission characteristic of a circuit by arranging external connection terminals so that the terminals making a pair in the circuit each other are adjacent and arranging an electromagnetic conversion element to hold it between the external connection terminals making a pair in the circuit. SOLUTION: An underlying insulation layer is deposited upon a substrate, and a reproducing magnetoresistive effect element 3 is formed on it, and simultaneously, reproducing extraction line 5-b connected to the external connection terminal is formed on it. Further, a recording inductive head element 6 and a recording extraction line 5-a are formed on it, and respective extraction lines are connected on the positions of the corresponding external connection terminals by through holes 7. In such a case, the external connection terminals 4-b are formed on the position holding the electromagnetic conversion element 10 between them, and the extraction lines 5-a pass through the side of the external connection terminal 4-b of one side of the electromagnetic conversion element 10, and form the external connection terminal pair 11-a. Thus, the area of the extraction line is expanded, and the impedance of the wiring is reduced.

7. 发明专利

JPH07192226A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH07192226A
公开(公告)日：1995-07-28
申请号：JP33463293
申请日：1993-12-28
申请人： HITACHI LTD
发明人： SUDA MITSUO , HONMA HISAYASU , TAKAGI MASAYUKI , KAMEOKA TETSUJI , KOYAMA NAOKI , MIYAMOTO NORIFUMI , TSUYOSHI TOSHIAKI
IPC分类号： G11B5/39
摘要： PURPOSE:To increase track density by widening the optical track width of a guided write head to be larger than a track pitch. CONSTITUTION:A guided write head 11 for recording signals in a medium is composed of an upper magnetic film 12, and lower magnetic film 15 used for a upper shield in common and conductor coil 13. A magneto-resistance effect read head 14 for reproducing the signals from the medium is composed of an upper shield film 15, lower shield film 16, magneto-resistance effector 17 sandwiched by those films, and electrode 18. There is the relation of Tww>Twr between the optical write track width (Tww) 2 of the guided write head 11 and the optical read track width (Twr) 19 decided by the gap between the electrodes 18 at the magneto-resistance effect read head 14, and the overwritten part is not reproduced. Thus, the relation of Tww+Twr

8. 发明专利

JPH06187615A MAGNETO-RESISTANCE EFFECT REPRODUCTION HEAD 失效
公开(公告)号：JPH06187615A
公开(公告)日：1994-07-08
申请号：JP33997992
申请日：1992-12-21
申请人： HITACHI LTD
发明人： ISHIKAWA CHIAKI , SUZUKI KO , KOYAMA NAOKI
IPC分类号： G11B5/39
摘要： PURPOSE:To provide a magneto-resistance effect reproduction head which can reduce the crosstalk quantity of the conventional head by 6-10dB and has the satisfactory off-track characteristic. CONSTITUTION:The magneto-resistance effect reproduction head has no coincidence between the center of a center magnetism-sensitive area 11 set in the track width direction and the center between the inner end faces of an electrode. In particular, the ratio (d/T) between the error (d) caused between the center of the area 11 and the distance T between the inner end faces of the electrode is set at 0.05-0.5 and preferably at 0.1-0.3.

9. 发明专利

JPH06104505A MAGNETORESISTANCE SENSOR, MAGNETIC HEAD AND MAGNETIC MEMORY EMPLOYING THE SENSOR 失效
公开(公告)号：JPH06104505A
公开(公告)日：1994-04-15
申请号：JP25133092
申请日：1992-09-21
申请人： HITACHI LTD
发明人： HOSOE YUZURU , KOYAMA NAOKI , HINODE KENJI , FURUSAWA KENJI , SHIROISHI YOSHIHIRO
IPC分类号： G01R33/09 , G01R33/06 , G11B5/39 , G11B5/82 , G11B11/10 , H01F10/08 , H01F10/14 , H01F10/32 , H01F41/32 , H01L43/08
摘要： PURPOSE:To provide a megnetoresistance sensor in which lowering of magnetic field sensitivity due to conduction of high detecting current is suppressed while retarding fracture of magnetosensitance part. CONSTITUTION:A protective layer 3 is provided on a magnetoresistive conductive layer 2 oppositely to a base material 1. A bias layer 5 for producing a bias field in the magnetoresistive conductive layer 2 and a pair of electrodes 6 for feeding current to a magnetosensitive part 4 of the magnetoresistive conductive layer 2 are then provided sequentially on the protective layer 3. The protective layer 3 is composed of a compound of at least one kind of element selected from a first group of titanium, vanadium, chrome, zirconium, molybdenum, niobium, hafnium, tantalum, and tungsten, and at least one kind of element selected from a second group of nitrogen, carbon, boron, and silicon.

10. 发明专利

JPH05135332A MAGNETO-RESISTANCE EFFECT PLAYBACK HEAD AND MAGNETIC RECORDING DEVICE USING THIS HEAD 失效
公开(公告)号：JPH05135332A
公开(公告)日：1993-06-01
申请号：JP12447092
申请日：1992-05-18
申请人： HITACHI LTD
发明人： KOBAYASHI TOSHIO , KITADA MASAHIRO , YUHITO ISAMU , SHIMIZU NOBORU , KOYAMA NAOKI
IPC分类号： G11B5/39
摘要： PURPOSE:To prevent rupture of a thin magneto-resistance layer in the level difference part of a hard magnetic material layer by preventing generation of Barkhausen noises with a structure which can simplify an element forming process and suppressing generation of a level difference in a magneto-resistance effect element layer and a recording head laminated thereon and the concn. of stresses. CONSTITUTION:A magneto-resistance effect film 3 consisting of a thin film of a ferromagnetic material having a central part maganetosensitive region 102 and a end part magnetic domain control region 103 and a hard magnetic material layer 1 consisting of a thin film of a hard magnetic material in direct contact with the end part magnetic domain control region 103 in superposition thereon are provided. The vertical magnetic bias by the magnetic field and the ferromagnetic exchange bond is generated in order to maintain the central part maganetosensitive region 102 of the magneto-resistance effect film 3 in a monomagnetic domain state.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式