Abstract: A material for magnetic pole for attaining a writing head generating an intense recording magnetic field, and a structure and a manufacturing method therefor. The thin film magnetic head includes a magnetic pole layer having a plated magnetic layer containing Co, Ni and Fe formed on a plated underlayer of a sputtered magnetic layer containing Co, Ni and Fe. The CoNiFe magnetic layer having a composition: 40 wt %≦Co≦70 wt %, 10 wt %≦Ni≦25 wt % and 10 wt %≦Fe≦30 wt % and a peak intensity ratio in the X-ray diffraction of I(200)/I(111)≧0.5 and I(110)/I(111)≧1 (defining peak intensities for the face-centered cubic fcc (111) face, fcc (200) face and the body-centered cubic bcc (119) face as: I(111), I(200), I(110)).

Abstract: Multiple thin films of spin-valve GMR sensor are formed in a trapezoidal cross-sectional shape by laminating an antiferromagnetic layer, a pinned magnetic layer, a nonmagnetic conductive layer, a free magnetic layer and a nonmagnetic protective layer on a lower insulated gap layer. The amount of etching of the lower insulated gap layer produced in the process of patterning the spin-valve giant magnetoresistive layers into the multiple thin films of spin-valve GMR sensor is 10 nm or less. Further, the angle &thgr; which the tangent line of each side face of the multiple thin films to the middle line of the free magnetic layer in its thickness direction forms with respect to the middle line of the free magnetic layer becomes 45 degrees or more. This structure makes it possible to provide such a spin-valve giant magnetoresistive head that it meets the requirements for securing constant breakdown voltage and preventing instability of MR output voltage waveform.

Abstract: A magnetic head comprises a retrieving unit 11 for converting magnetic information output from a recording medium into an electric signal, a writing unit 10 having the function of electromagnetic conversion for writing the magnetic information in the recording medium in response to the electric signal, and a first protective film 30 formed on the retrieving unit. A second protective film 31 is formed on the first protective film 30. The coefficient of linear expansion of the second protective film 31 is reduced in comparison with that of the first protective film 30. Furthermore, the first protective film is an alumina film; in contrast, the second protective film is a film made of an alumina film containing silicon oxide therein.

Abstract: The present invention is to provide a thin film magnetic head intended to increase precision of and to narrow a width which determines a track width of a write thin film magnetic head and to supply a stably high output substantially free from write blurring on a disk, and a method for manufacturing the same. The thin film magnetic head consisting of a magnetic circuit comprising a read head to read information, a lower magnetic film, a magnetic gap and an upper magnetic film formed with a magnetic gap between it and the lower magnetic film; and of a write head comprising a coil positioned between the upper magnetic film and the lower magnetic film and an insulating film for insulting the coil and the upper magnetic film from each other, wherein the upper magnetic film is configured of an upper first magnetic film, an upper second magnetic film and an upper third magnetic film, and the upper first magnetic film is connected to the upper third magnetic film via the upper second magnetic film.

Abstract: A material for magnetic pole for attaining a writing head generating an intense recording magnetic field, and a structure and a manufacturing method therefor. The thin film magnetic head includes a magnetic pole layer having a plated magnetic layer containing Co, Ni and Fe formed on a plated underlayer of a sputtered magnetic layer containing Co, Ni and Fe. The CoNiFe magnetic layer having a composition: 40 wt %≦Co≦70 wt %, 10 wt %≦Ni≦25 wt % and 10 wt %≦Fe≦30 wt % and a peak intensity ratio in the X-ray diffraction of I(200)/I(111)≧0.5 and I(110)/I(111)≧1 (defining peak intensities for the face-centered cubic fcc (111) face, fcc (200) face and the body-centered cubic bcc (119) face as: I(111), I(200), I(110)).

Abstract: Multiple thin films of spin-valve GMR sensor are formed in a trapezoidal cross-sectional shape by laminating an antiferromagnetic layer, a pinned magnetic layer, a nonmagnetic conductive layer, a free magnetic layer and a nonmagnetic protective layer on a lower insulated gap layer. The amount of etching of the lower insulated gap layer produced in the process of patterning the spin-valve giant magnetoresistive layers into the multiple thin films of spin-valve GMR sensor is 10 nm or less. Further, the angle &thgr; which the tangent line of each side face of the multiple thin films to the middle line of the free magnetic layer in its thickness direction forms with respect to the middle line of the free magnetic layer becomes 45 degrees or more. This structure makes it possible to provide such a spin-valve giant magnetoresistive head that it meets the requirements for securing constant breakdown voltage and preventing instability of MR output voltage waveform.

Abstract: A magnetoresistive reproducing head is manufactured by forming a magnetoresistive film and a lead layer continuously, then etching only the lead layer by using a first layer photo-resist pattern, forming a second layer photo-resistive pattern while leaving the first layer photo-resist pattern, etching the magnetoresistive film and then forming a domain control film and an outer lead layer, thereby enabling to avoid the effect at all on the positional relation between the lead layer and domain control film, whereby a head in which the riding amount of the lead layer on the magnetoresistive film is in right-to-left symmetry and the sensitivity profile is in right-to-left symmetry can be manufactured at a good yield.

Abstract: Disclosed is a magnetic disk apparatus including a magnetic reproducing head portion, and a magnetic recording head including an upper magnetic core having a end portion and a rear portion. As a resist for a frame which is used for forming the rear portion, a negative resist or an electron beam resist is used, whereby the frame is formed without any adverse effect of halation from a coil insulating film. That is, it is possible to manufacture a magnetic recording head in which the rear portion of an upper magnetic core is not emerged at the face opposed to a medium, and hence to obtain a magnetic disk apparatus exhibiting an areal recording density of 5 Gbit/in2 or more by mounting a magnetic recording/reproducing head including such a magnetic recording head.

Abstract: A material for magnetic pole for attaining a writing head generating an intense recording magnetic field, and a structure and a manufacturing method therefor. The thin film magnetic head includes a magnetic pole layer having a plated magnetic layer containing Co, Ni and Fe formed on a plated underlayer of a sputtered magnetic layer containing Co, Ni and Fe. The CoNiFe magnetic layer having a composition: 40 wt %≦Co≦70 wt %, 10 wt %≦Ni≦25 wt % and 10 wt %≦Fe≦30 wt % and a peak intensity ratio in the X-ray diffraction of I(200)/I(111)≧0.5 and I(110)/I(111)≧1 (defining peak intensities for the face-centered cubic fcc (111) face, fcc (200) face and the body-centered cubic bcc (119) face as: I(111), I(200), I(110)).

Abstract: Multiple thin films of spin-valve GMR sensor are formed in a trapezoidal cross-sectional shape by laminating an antiferromagnetic layer, a pinned magnetic layer, a nonmagnetic conductive layer, a free magnetic layer and a nonmagnetic protective layer on a lower insulated gap layer. The amount of etching of the lower insulated gap layer produced in the process of patterning the spin-valve giant magnetoresistive layers into the multiple thin films of spin-valve GMR sensor is 10 nm or less. Further, the angle &thgr; which the tangent line of each side face of the multiple thin films to the middle line of the free magnetic layer in its thickness direction forms with respect to the middle line of the free magnetic layer becomes 45 degrees or more. This structure makes it possible to provide such a spin-valve giant magnetoresistive head that it meets the requirements for securing constant breakdown voltage and preventing instability of MR output voltage waveform.

Abstract: Disclosed is a magnetic disk apparatus including a magnetic reproducing head portion, and a magnetic recording head including an upper magnetic core having a end portion and a rear portion. As a resist for a frame which is used for forming the rear portion, a negative resist or an electron beam resist is used, whereby the frame is formed without any adverse effect of halation from a coil insulating film. That is, it is possible to manufacture a magnetic recording head in which the rear portion of an upper magnetic core is not emerged at the face opposed to a medium, and hence to obtain a magnetic disk apparatus exhibiting an areal recording density of 5 Gbit/in2 or more by mounting a magnetic recording/reproducing head including such a magnetic recording head.

Abstract: A magnetic domain controlling film for controlling the magnetic domain of a magnetoresistive film is formed by the patterning technique on a lower insulating film formed on a lower shield film. The magnetoresistive film is formed on the magnetic domain controlling film for converting a magnetic signal from a magnetic recording medium into an electrical signal using the magnetoresistive effect. A resist pattern is formed by the lift-off method on the magnetoresistive film in such a fashion as to leave a region of the magnetoresistive film corresponding to the tracks of the magnetic recording medium. A magnetoresistive element is formed by ion milling leaving only the portion of the magnetoresistive film corresponding to the tracks.

Abstract: A magnetic domain controlling film for controlling the magnetic domain of a magnetoresistive film is formed by a patterning technique on a lower insulating film formed on a lower shield film. The magnetoresistive film is formed on the magnetic domain controlling film for converting a magnetic signal from a magnetic recording medium into an electrical signal using the magnetoresistive effect. A resist pattern is formed by the lift-off method on the magnetoresistive film in such a fashion as to leave a region of the magnetoresistive film corresponding to the tracks of the magnetic recording medium. A magnetoresistive element is formed by ion milling leaving only the portion of the magnetoresistive film corresponding to the tracks.

Abstract: A magnetoresistive head is fabricated with a high yield rate by preventing the electrode film from breaking down. An upper shield film is formed with an electrode separation layer and an upper gap film disposed between it and the electrode film. The electrode film is prevented from being etched when the upper shield film is subjected to ion milling as a result. Further, the upper gap film is laid on top of the electrode separation layer, and a lead is satisfactorily protected and prevented from being exposed. Thus, the upper shield film and the lead are prevented from becoming short-circuited as a result of the disconnection of the electrode film and the exposure of the lead.

Abstract: A magnetic disc apparatus includes a magnetic disc for recording information; a thin film magnetic head including a magnetic pole structure having an upper magnetic pole tip and a lower magnetic pole tip arranged to provide a magnetic gap at respective end portions thereof for writing and reading information in and from the magnetic disc; a device for rotating the magnetic disc; and a device for positioning the thin film magnetic head; the upper and lower magnetic pole tips having different contours at the respective end portions as viewed from a side confronting the magnetic disc wherein the difference (.DELTA.CW in .mu.m) in the width, along the magnetic gap, of the upper magnetic pole tip and the width, along the magnetic gap, of the lower magnetic pole tip satisfies the relation0<.DELTA.CW.ltoreq.5000/Trfor the magnetic disc having a track density Tr of 1800 or more tracks per inch.

Abstract: A magnetic head for reading from and/or writing to a magnetic information storage medium has a substrate on which a plurality of thin films are formed in sequence. The films provide a magnetic circuit having a magnetic gap, a bottom pole piece and a top pole piece overlying said bottom pole piece. The top pole piece is formed as a tip portion adjoining the magnetic gap and a rear portion which makes magnetic contact with the tip portion. The rear portion is formed in the sequence after the tip portion. To ensure accurate thickness and width of the tip portion, a non-magnetic protective film is formed on the tip portion after the tip portion is formed and before the rear portion is formed.

Abstract: A thin film magnetic head including conductor coils, a plurality of insulating layers to interpose and insulate the conductor coils and a magnetic gap layer between upper and lower magnetic cores, in which another insulating layer is provided on a stepped region formed by end faces of the plurality of insulating layers.

Abstract: A magnetoresistive head is disclosed. It comprises a lower gap film, a magnetoresistive film, a bias film, an electrode, an upper gap film, and upper shield film provided in sequence on a substrate. A protective film is provided under the upper shield film to prevent the upper gap film and electrode from the undesirable etching during patterning the upper shield film.

Abstract: A method of forming a thin film pattern on a base having a step portion. This method comprises a first step of forming a thin film of given material on the base, a second step of forming a predetermined pattern of a first photoresist film on said thin film at one of a first portion including a lower part of the step portion and a second portion including an upper part of the step portion, a third step of forming a predetermined pattern of a second photoresist film on said thin film at the other of the first and second portions and a fourth step of applying ion-milling to said thin film of given material using masks said first and second photoresist film patterns formed on said thin film at the first and second portions.

Abstract: A thin film magnetic head comprising a lower magnetic film, an upper magnetic film which is formed over the lower magnetic film and in which one end is come into contact with one end of the lower magnetic film and the other end faces the other end of the lower magnetic film through a magnetic gap and thereby forming a magnetic circuit which has a magnetic gap in a part thereof, together with the lower magnetic film, and a conductor coil forming a coil of a predetermined number of turns and passing between the upper and lower magnetic films and crossing the magnetic circuit. Each of the upper and lower magnetic films is formed of a Co-Ni-Fe ternary alloy having a face-centered cubic crystal structure. Also, uniaxial anisotropy is alternately and perpendicularly given in every layer of a predetermined thickness stacked in the direction of thickness of the film.