专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

91. 发明专利

JP2002309353A SOFT-MAGNETIC MEMBRANE AND MAGNETIC HEAD FOR RECORDING USING THE MEMBRANE 失效
公开(公告)号：JP2002309353A
公开(公告)日：2002-10-23
申请号：JP2001116021
申请日：2001-04-13
申请人： FUJITSU LTD
发明人： IKEDA SHOJI , TAGAWA IKUYA , UEHARA YUJI , OTSUKA YOSHINORI
IPC分类号： C22C38/00 , C22C19/07 , G11B5/127 , G11B5/31 , G11B5/39 , H01F10/13 , H01F10/16
摘要： PROBLEM TO BE SOLVED: To provide a soft-magnetic material which is provided with a high saturation magnetic flux density Bs, and also exhibits preferable soft-magnetic properties directly after membrane deposition or after a low temperature heat treatment. SOLUTION: The soft-magnetic membrane contains Fe, Co, a metal element M and oxygen O so as to satisfy the compositional formula of (Fe1-a Coa )x My Oz , and the metallic element M is one selected from the groups consisting of Al, B, Ga, Si, Ge, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Rh, Ru, Ni, Pd and Pt or an alloy consisting of them. The compositional formula satisfies a=0.05 to 0.65, y=0.2 to 9 at%, z=1 to 12 at%, y+z

92. 发明专利

JP2001319302A INFORMATION RECORDER 失效
公开(公告)号：JP2001319302A
公开(公告)日：2001-11-16
申请号：JP2000139466
申请日：2000-05-12
申请人： FUJITSU LTD
发明人： NISHIDA SHUJI , TAGAWA IKUYA , UEHARA YUJI
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , G11B5/024 , G11B5/09 , G11B19/02
摘要： PROBLEM TO BE SOLVED: To provide an information recorder for recording information with high recording density and so as to reduce the error rate. SOLUTION: This recorder is furnished with a recording head 20 arranged so as to be close to or in contact with a recording medium to apply the magnetic field on each very small area when the head is relatively moved with respect to this recording medium and passed through the respective very small areas of the recording medium, and a magnetic head control part 55 for controlling this recording head so as to make the recording head erase the information in the specified free area by applying the magnetic field on each very small area in the specified free area of the recording medium to align the magnetizing direction of each very small area in the course of standby when at least the information is not recorded on the recording medium.

93. 发明专利

JP2001067613A FORMATION OF MAGNETIC HEAD 失效
公开(公告)号：JP2001067613A
公开(公告)日：2001-03-16
申请号：JP24770299
申请日：1999-09-01
申请人： FUJITSU LTD
发明人： KIYOMIYA TERUO , UEHARA YUJI
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To make it possible to form a head having a high ability of high-speed magnetic recording by laminating a thermal shrinkage layer consisting of a thermal shrinkable material later in lamination order than a conductor layer and heating a laminate laminated with plural layers including this thermal shrinkage layer and a magnetic pole layer to shrink the thermal shrinkage layer. SOLUTION: A layer of copper constituting a coil is laminated on an insulating layer formed by applying a photoresist to a coil forming region and curing this photoresist by heating. The photoresist is again applied to this conductor layer and is cured by heating to form the insulating layer 70, on which an upper magnetic pole 41 is formed. As a result, an inductive head 10 corresponding to the laminate is formed. This inductive head 10 is heated together with a substrate 20 to shrink the insulating layer 70, by which the magnetic domain structure of the upper magnetic pole 41 is improved. The shrinkage of the resist occurs even in the once cured resist insulating layer 70 when a heat treatment is applied again thereto and a compressive stress is generated in the upper magnetic pole 41 by this shrinkage.

94. 发明专利

JP2000020915A MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JP2000020915A
公开(公告)日：2000-01-21
申请号：JP18478098
申请日：1998-06-30
申请人： FUJITSU LTD
发明人： OTSUKA YOSHINORI , TAGAWA IKUYA , IKEGAWA YUKINORI , KUTSUZAWA TOMOKO , UEHARA YUJI , HASEGAWA MINORU
IPC分类号： G11B5/127 , G11B5/187 , G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To enhance the strength of generated magnetic fields by executing shaping of magnetic poles in a magnetic head and a process for generating the same. SOLUTION: This process for producing the magnetic head includes various stages of forming a recording lower magnetic pole and a recording upper magnetic pole and partially subjecting the pole near the floating surface of the upper magnetic pole and the upper layer part of the lower magnetic pole existing on the lower periphery of the pole to a trimming treatment by an ion milling method and regulates the magnetic core width of the pole. In this case, the ion milling method executes milling by regulating the incident angle θi of ions within the range of 65 to 85 deg. with the flanks of the upper magnetic pole. As a result, the decrease in the film thickness on the surface of the upper magnetic pole may be substantially prevented.

95. 发明专利

JPH11185223A SPIN VALVE HEAD AND ITS PRODUCTION AS WELL AS MAGNETIC DISK DRIVE ASSEMBLY USING SPIN VALVE HEAD 失效
公开(公告)号：JPH11185223A
公开(公告)日：1999-07-09
申请号：JP35751197
申请日：1997-12-25
申请人： FUJITSU LTD
发明人： TAGAWA IKUYA , YAMADA KENICHIRO , UEHARA YUJI
IPC分类号： G11B5/012 , G11B5/31 , G11B5/39 , H01F10/32
摘要： PROBLEM TO BE SOLVED: To provide a spin valve head which decreases noises. SOLUTION: This head 10 is the spin valve head which has spin valve films 11 having at least a stationary side magnetic layer 4, a nonmagnetic metallic layer 3 and a free side magnetic layer 2, a hard magnetic layer 6 for controlling the magnetic domains of the free side magnetic layer 2 and an electrode element 7 for passing a sense current to the spin valve film 11. The spin valve head is so formed that the respective orthogonal projections of the spin valve film 11 thickness direction of the hard magnetic layer 6 and the free side magnetic layer 2 do not overlap on each other. A single domain structure which does not give rise to a reverse magnetic field region over the entire surface of the free side magnetic layer 2 is obtd. and the occurrence of a hysteresis phenomenon is averted in the output of the spin valve head by adopting such structure. Then, the output which does not generate the noises is obtd.

96. 发明专利

JPH09293211A MAGNETIC RESISTANCE EFFECT HEAD AND MAGNETIC RECORDER 失效
公开(公告)号：JPH09293211A
公开(公告)日：1997-11-11
申请号：JP10693396
申请日：1996-04-26
申请人： FUJITSU LTD
发明人： OTSUKA YOSHINORI , KOSHIKAWA YOSHIO , MIZOSHITA YOSHIBUMI , UEHARA YUJI , KANDA HIDEKAZU , AOSHIMA KENICHI , KANAI HITOSHI , KANE JIYUNICHI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To obtain high sensitivity and also to suppress the fluctuation of the base line of a reproduced output by providing a first electrode having an inclinded edge part with respect to the surface opposed to a magnetic recording medium and a second electrode which has an edge part almost parallel with the edge part and is formed with an interval. SOLUTION: An insulative first gap layer 5 is formed on a first magnetic shielding layer 4 and an MR(magnetic resistance effect) layer 6 is formed on the layer 5. Hard magnetic layers 7, 8 are formed at both side parts of the MR layer 6 for the sake of the controlling of the magnetic section of the MR layer 6. Moreover, insulating parts layers 9 are formed at respective upwards of the magnetic layers 1, 8. A first electrode 10 and a second electrode 11 are formed on the MR layer 6 with an interval. Such layers 6, 7, 8 and electrodes 10, 11 are covered with a second gap layer 12 and a second magnetic shielding layer 13 is formed on the layer 12. The directivity of a current becomes satisfactory and then the sensitivity of a head is enhanced by adopting such structure.

97. 发明专利

JPH09259411A MAGNETO-RESISTANCE EFFECT TYPE MAGNETIC HEAD AND MAGNETIC RECORDER 失效
公开(公告)号：JPH09259411A
公开(公告)日：1997-10-03
申请号：JP6780596
申请日：1996-03-25
申请人： FUJITSU LTD
发明人： YAMADA KENICHIRO , TANAKA HIDEKAZU , KANAI HITOSHI , KANAMINE MASAAKI , UEHARA YUJI
IPC分类号： G11B5/39 , H01L43/08
摘要： PROBLEM TO BE SOLVED: To reduce scattering electrons in an interface between layers and to increase the specific resistance change to the external field and then suppressing the increase of specific resistance value so as to obtain a high output by forming an MR layer with a prescribed film thickness and constituting this layer of an NiFe layer and a CoFe layer. SOLUTION: An MR element 5 is composed of a soft magnetic substance layer 6, a nonmagnetic substance layer 7, the MR layer 8, and one pair of lead terminals 9 and 10, formed in turn from the side of a magnetic shield layer 2. The MR layer 8 has its thickness of a film thickness of 20-140Å, and has also a two-layer structure of the NiFe layer 8a and the CoFe layer 8b, where the NiFe layer 8a is formed on the side near the magnetic shield layer 2. Then, in the MR element 5, the MR layer 8 and the soft magnetic substance layer 6 have easily-magnetized axes in their longitudinal direction (y-direction).

98. 发明专利

JPH0836718A MAGNETORESISTANCE EFFECT-TYPE MAGNETIC HEAD 失效
公开(公告)号：JPH0836718A
公开(公告)日：1996-02-06
申请号：JP17462294
申请日：1994-07-26
申请人： FUJITSU LTD
发明人： KANE JIYUNICHI , UEHARA YUJI
IPC分类号： G11B5/31 , G11B5/39
摘要： PURPOSE:To easily control magnetic domains at both ends of a magnetoresistance effect element and improve a durability of the element by forming a magnetic layer which shows hard magnetic properties on an undercoat film, while displaying soft magnetic properties on a soft magnetic layer, on the undercoat film and the soft magnetic layer. CONSTITUTION:An undercoat film 12 formed out of W is formed on a soft magnetic layer 11 of an NiFeCr film or the like. A CoCrTa film 13 is formed on the surfaces of the layer 11 and the film 12. Then, an intermediate layer 14 of Ta is selectively formed at a part on the film 13 which becomes a sense area 18. A magnetoresistance effect (MR) element 15 is formed on the film 13 and the layer 14. Lead-out electrodes 16 and 17 are formed on the element 15 to hold the area 18 therebetween. Accordingly, an MR head of high durability can be obtained without using an FeMn film which is easy to corrode.

99. 发明专利

JPH07110920A MAGNETIC RECORDING/REPRODUCTION HEAD 失效
公开(公告)号：JPH07110920A
公开(公告)日：1995-04-25
申请号：JP25571493
申请日：1993-10-13
申请人： FUJITSU LTD
发明人： UEHARA YUJI , KANE JIYUNICHI
IPC分类号： G11B5/31 , G11B5/39
摘要： PURPOSE:To obtain a magnetic recording/reproduction head which eliminates unstable reproducing operation by making a magnetoresistance effect element shorter than the depth of a gap in an in-gap type magnetic recording/ reproduction head having the magnetoresistance effect element. CONSTITUTION:A magnetic recording/reproduction head has a first magnetic pole 2 comprising the substrate made of a magnetic material, a thin film laminate coil 6 formed on the first magnetic pulse 2 together with a non-magnetic insulation film 4 and a second magnetic pole 8 connected magnetically to the first magnetic pole 2. The tip part of the magnetic pole 8 forms gaps 10 parallel in proximity to the first magnetic pole 2. A magnetoresistance effect element 12 is arranged between the gaps 10. The length in the depth of the gaps 10 of the magnetoresistance effect element 12 is made shorter than the depth thereof 10. Thus, in the recording operation, there is no slant component generated in a magnetic field to be applied to the magnetoresistance effect element 12 and a magnetic wall is hard to occur in the magnetoresistance effect element 12 thereby making possible the prevention of the reproducing operation from becoming unstable.

100. 发明专利

JPH06325331A MAGNETO-RESISTANCE EFFECT HEAD 失效
公开(公告)号：JPH06325331A
公开(公告)日：1994-11-25
申请号：JP30263793
申请日：1993-12-02
申请人： FUJITSU LTD
发明人： KOSHIKAWA YOSHIO , OTSUKA YOSHINORI , UEHARA YUJI , TODA JUNZO , MIZOSHITA YOSHIBUMI
IPC分类号： G11B5/31 , G11B5/39
摘要： PURPOSE:To provide a magneto-resistance effect head stabilized in response function with the signal magnetic fields from a recording medium at the time of reproduction by preventing the fluctuation in the magnetic domains of a flux guide. CONSTITUTION:This magneto-resistance effect head includes a magneto- resistance effect element 22 which converts a change in the signal magnetic field leaking from the recording tracks of the recording medium 34 into a resistance change and is disposed to recess from the front end face 26 of a head facing the recording medium 34. The magneto-resistance effect element 22 is connected to a pair of terminals 28a, 28b and a sense region 22a is delineated between both terminals 28a and 28b. One end of the magneto-resistance effect element 22 is magnetically coupled to the other end of the flux guide 24 exposed to the front end face 26 of the head. The flux guide 24 has an approximately rectangular shape extending in the transverse direction of the recording track of the recording medium 34 beyond the sense region 22a of the magneto- resistance effect element 22.

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