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31. 发明专利

JPH0973610A PRODUCTION OF MAGNETO-RESISTIVE HEAD 失效
公开(公告)号：JPH0973610A
公开(公告)日：1997-03-18
申请号：JP33959395
申请日：1995-12-26
申请人： FUJITSU LTD
发明人： UEHARA YUJI , KANAI HITOSHI , KANAMINE MASAAKI , OTSUKA YOSHINORI , KITAJIMA MASAMITSU , KAKEHI MASAHIRO , TODA JUNZO , WATABE KEIJI , NOZAKI KOJI , IGARASHI YOSHIKAZU , KURAMITSU YOKO , YANO EI , NAMIKI TAKAHISA , SHIRATAKI HIROSHI , OTSUKA KEITA
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To make it possible to pattern films with good accuracy and to suppress the occurrence of the damage of a resist at the time of producing of a magneto-resistive head including a pattern forming stage by lift-off. SOLUTION: An org. film is formed on multilayered films constituting a magneto-resistive element 5 and an upper film 7 consisting of a resist or inorg. film is formed on this org. film 6. The org. film 6 and the upper film 7 are patterned to bite the edges of the patterns of the org. film 6 inward from the edge of the patterns of the upper film 7. The bite quantity thereof is confined to the extent that the molecules of the thin films formed on the upper film 7 and the multilayered films are not adhered to the side parts of the patterns of the org. film 6.

32. 发明专利

JPH07210830A MAGNETO-RESISTANCE EFFECT HEAD 失效
公开(公告)号：JPH07210830A
公开(公告)日：1995-08-11
申请号：JP632194
申请日：1994-01-25
申请人： FUJITSU LTD
发明人： UEHARA YUJI
IPC分类号： G11B5/39
摘要： PURPOSE:To obtain a magneto-resistance effect head which is drastically suppressed in Barkhausen noises by simple constitution. CONSTITUTION:Drawing out conductor layers 4 for passing sense currents to magneto-resistance effect layers (MR layers) 1 are respectively connected to both end face parts in the longitudinal direction of soft magnetic layers 3 of the magneto-resistance effect head which is adjacently formed with the MR layers 1 and the soft magnetic layers 3 via intermediate nonmagnetic separating layers 2 and forms bias magnetic fields in the signal detection regions of the MR layers 1 and the soft magnetic layers 3 by shunting of part of the sense currents passed in the longitudinal direction of the MR layers 1 to the soft magnetic layers 3. The connection relations of the MR layers 1, the soft magnetic layers 3 and the drawing out conductor layers 4 are varied from heretofore by such constitution and the fresh current distribution according thereto creates a difference in the magnetization states of the MR layers 1 and the soft magnetic lavers 3 and the behavior of magnetization in the signal detection regions PQRS, by which the effect of drastically suppressing the Barkhansen jump is produced.

33. 发明专利

JPH0729123A MAGNETORESISTANCE EFFECT HEAD 失效
公开(公告)号：JPH0729123A
公开(公告)日：1995-01-31
申请号：JP17386593
申请日：1993-07-14
申请人： FUJITSU LTD
发明人： KITAJIMA MASAMITSU , UEHARA YUJI
IPC分类号： G11B5/39
摘要： PURPOSE:To prevent a short circuit of an upper magnetic shield layer by a burr of a leading conductive layer of an MR element exposed at a confronting surface of an MR head to a medium when the leading conductive layer slides in touch with a surface of the magnetic recording medium. CONSTITUTION:The invention relates to a magnetoresistance effect head (MR head) used in a magnetic disc apparatus or the like, more particularly, to the shape of a confronting surface of the head to a recording medium. A leading conductive layer 5 is laminated and connected at both ends of an MR element 4. The area of an end face exposed at a confronting surface 10a of the leading conductive layer 5 when the end face is in touch with the magnetic recording medium is sufficiently reduced.

34. 发明专利

JPH06267030A MAGNETORESISTANCE EFFECT TYPE HEAD AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH06267030A
公开(公告)日：1994-09-22
申请号：JP5529293
申请日：1993-03-16
申请人： FUJITSU LTD
发明人： AOYAMA SUSUMU , UEHARA YUJI , KOSHIKAWA YOSHIO , KANAMINE MASAAKI , KANE JIYUNICHI , OTSUKA YOSHINORI
IPC分类号： G11B5/39
摘要： PURPOSE:To improve the quality of a reproduction signal remarkably by providing a leading conductor layer composing a radiation path of an MR element in such a manner as to sandwich the MR element from both the front and the rear thereof to reduce thermal noises as produced by heat generated from the MR element. CONSTITUTION:A pair of leading conductors 32 are provided in contact with both end parts of a magnetoresistance effect element 31 to demarcate a signal detection area (a) of the effect element 31. The effect element 31 and the conductor layer 32 are arranged being insulated from the lower and upper magnetic shield layers 33b and 33a through an lower reproduction gap layer 30b and an upper reproduction gap layer 30a. In this manner, as the effect element 31 is provided facing the upper and lower magnetic shield layers 33a and 33b in such a manner as to be sandwiched from both sides thereof, the leading conductor layer 32 is in contact with both the front and the rear of the effect element 31 making an heat radiation area of the effect element 31 almost double. This can improve the heat radiation efficiency of the effect element 31 expressively thereby suppressing the generation of heat.

35. 发明专利

JPH06168413A COMBINED MAGNETIC HEAD 失效
公开(公告)号：JPH06168413A
公开(公告)日：1994-06-14
申请号：JP32000092
申请日：1992-11-30
申请人： FUJITSU LTD
发明人： OTSUKA YOSHINORI , UEHARA YUJI
IPC分类号： G11B5/265 , G11B5/39
摘要： PURPOSE:To suppress static noise detection at the time of reproducing and to prevent the electrostatic destruction of a yoke by forming this yoke of a soft magnetic film and eliminating a potential difference and charge accumulation between a magnetic core and a recording medium. CONSTITUTION:A pair of upper and lower magnetic layers 3, 4 are formed via a nonmagnetic insulating layer 2 on a conductive substrate 1. These layers as a magnetic shield are provided with a yoke 6, the front end of which exists in a front end gap part 4a between the upper layer 3 and the lower layer 4 and which faces the surface of a magnetic recording medium and gathers the magnetic fluxes from the magnetization recorded on the medium surface within the nonmagnetic insulating layer 5 between the layers 3 and 4. An MR element 7 having two pieces of leader electrodes 7a connected by superposing the rear ends of this yoke via the layer 5 and the layers 3, 4 to serve as magnetic poles are coupled in a magnetic path coupling part 4b. Spiral coil conductor layers 8 and an insulating protective layer 9 for the layer 3 are circumferentially provided. As a result, the combined magnetic head is constituted and is connected via a columnar conductive material 10 to the substrate 1. Further, the substrate 1 is grounded or is connected at the same potential as the potential of the medium to eliminate the charge accumulation between the magnetic core and the yoke.

36. 发明专利

JPH06119621A MAGNETO-RESISTANCE EFFECT ELEMENT AND MAGNETO-RESISTANCE EFFECT HEAD 失效
公开(公告)号：JPH06119621A
公开(公告)日：1994-04-28
申请号：JP26489492
申请日：1992-10-02
申请人： FUJITSU LTD
发明人： UEHARA YUJI
IPC分类号： G11B5/39
摘要： PURPOSE:To impress a magnetic bias to the magneto-resistance effect element with small sense current and good efficiency by distributing the saturation magnetic flux density of the magneto-resistance effect element in such a manner that the saturation magnetic flux density is small in the layer of the magneto-resistance effect element to be weakly impressed with the bias magnetic field. CONSTITUTION:The magneto-resistance effect element 1a, a nonmagnetic material layer 1b and a soft magnetic material layer 1c are successively laminated. This magneto-resistance effect element 1a is constituted of ferromagnetic material films in two-layered structure. The layer 1a to which the bias magnetic field H1 is strongly applied on the side in contact with the nonmagnetic material layer 1b consists of 'Permalloy ' (Ni-Fe alloy) contg. about 20at.% Fe and the saturation magnetic flux density thereof is about 10kG. On the other hand, the layer 1a2 to which the bias magnetic field H2 is weakly applied consists of 'Permalloy ' contg. about 15at.% Fe and the saturation magnetic flux density is about 9kG. These layers 1a1, 1a2 are formed by a high-frequency sputtering method using gaseous Ar as a sputtering gas. As a result, the magnetic bias is impressed to the magneto-resistance effect element with the small sensor current Is and the good efficiency.

37. 发明专利

JPH05335169A 失效
公开(公告)号：JPH05335169A
公开(公告)日：1993-12-17
申请号：JP13821492
申请日：1992-05-29
申请人： FUJITSU LTD
发明人： UEHARA YUJI
IPC分类号： H01F10/12 , H01F10/26 , H01F10/32 , H01F41/18
摘要： PURPOSE:To easily form a magnetic thin film of Fe-N which is small in internal stress even if it is enhanced in magnetic characteristics, where usually a magnetic thin film enhanced in magnetic characteristics such as permeability and the like becomes large in internal stress and is apt to separate off. CONSTITUTION:A magnetic thin film 23 is formed of material composed of one element selected from Fe, Co, and Ni and at least one element selected from B, C, and N, a magnetic field variable in intensity is applied to the surface of a thin film by a magnetic field applying means while it is formed for the formation of a first magnetic layer 22a and a second magnetic layer 22b, and the layers 22a and the layers 22b are alternately laminated to form the magnetic thin film 23.

38. 发明专利

JPH05182148A MAGNETO-RESISTANCE EFFECT HEAD 失效
公开(公告)号：JPH05182148A
公开(公告)日：1993-07-23
申请号：JP26692
申请日：1992-01-06
申请人： FUJITSU LTD
发明人： UEHARA YUJI
IPC分类号： G11B5/39
摘要： PURPOSE:To obtain soft magnetic films suitable for biasing by using the soft magnetic films formed by laminating at least >=2 kinds of magnetic materials as the soft magnetic material films. CONSTITUTION:The magneto-resistance effect head is constituted with an MR film 1, the soft magnetic films 2 and a nonmagnetic sepn. film 3. The soft magnetic films 2 formed by laminating at least >=2 kinds of the magnetic materials 2a, 2b are used as the soft magnetic films 2 formed in proximate to the MR film 1. The soft magnetic films 2 are formed by laminating, for example, an amorphous material consisting of a Co system and a magnetic material consisting of an Fe system. A CoZrMo film is formed as the amorphous material consisting of the Co system and an FeN film as the magnetic material consisting of the Fe system by an RF sputtering method. The magnetic head having excellent characteristics is obtd. by approximating the soft magnetic films 2 to the magneto-resistance effect film of the magneto-resistance effect head in such a manner.

39. 发明专利

JPH04214273A SLIDER FOR THIN-FILM MAGNETIC HEAD 失效
公开(公告)号：JPH04214273A
公开(公告)日：1992-08-05
申请号：JP40183990
申请日：1990-12-13
申请人： FUJITSU LTD
发明人： UEHARA YUJI
IPC分类号： G11B21/21
摘要： PURPOSE:To enhance the low floating stability to a thin-film magnetic disk by adopting the structure to reduce the weight of the slider for thin-film magnetic heads to be used for a magnetic disk device and to decrease the additional load by a supporting beam for load without decreasing the region where the floating force generating surface of floating rails and the head are disposed. CONSTITUTION:This slider consists of a pair of the parallel floating rails 21, 22 having the regions to be installed with the thin-film magnetic head on the floating force generating surface 24 and air flow outflow end face 25 facing the magnetic recording medium and a rail supporting part 26 which connects and supports these floating rails 21, 22 on the air flow outflow end side. The surface of this rail supporting part 26 facing the recording medium and the rear surface on the side opposite from the above-mentioned surface facing the recording medium are respectively formed to the tapered surfaces 27 and 28 inclining the air flow inflow direction from the air flow outflow side.

40. 发明专利

JPH0426909A MAGNETO-RESISTANCE EFFECT TYPE HEAD 失效
公开(公告)号：JPH0426909A
公开(公告)日：1992-01-30
申请号：JP13115090
申请日：1990-05-23
申请人： FUJITSU LTD
发明人： UEHARA YUJI , KANAI HITOSHI , KOSHIKAWA YOSHIO , KANEMINE MASAAKI , KANDA HIDEKAZU
IPC分类号： G11B5/00 , G11B5/39
摘要： PURPOSE:To suppress the Barkhausen noises by the movement of the magnetic wall in a magneto-resistance effect element by disposing a conductor layer to serve as a means for generating current magnetic fields near the side of the magneto-resistance effect element where the element does not face a magnetic easy axis direction medium in such a manner that the layer is perpendicular to the element surface of the magneto-resistance effect element and impressing a current magnetic field in the easy axis direction of the element. CONSTITUTION:A current J is passed to the U-shaped conductor layer 15 disposed near the magneto-resistance effect (MR) element 11, by which the magnetic lines of force phi having the part parallel with the MR element 11 is generated in the part perpendicular to the MR element surface of the conductor layer 15 and a magnetic field H is impressed in the longitudinal direction of the element. The static magnetic energy by the diamagnetic field in the MR element 11 is, therefore, lowered and the MR element 11 is made into the single magnetic domain structure having no magnetic walls. Since there is no movement of the magnetic wall, the Barkhausen noises are suppressed in this way.

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