Abstract: A method for making a thin-film magnetic head having a magnetoresistive effect element wherein an insulating layer is formed under an electrode layer of a magnetoresistive effect element with a lower gap layer interposed therebetween. As a result, the distance between the electrode layer and the lower shielding layer becomes longer, thus permitting maintenance of a satisfactory electrical insulation.

Abstract: A thin film magnetic head includes a lower shielding layer composed of a magnetic material; a nonmagnetic MR gap layer on the lower shielding layer; a magnetoresistive element layer in the MR gap layer facing a recording medium; a lower core layer composed of a magnetic material on the MR gap layer; an upper core layer composed of a magnetic material being opposed to the lower core layer with a nonmagnetic gap layer therebetween at the surface facing the recording medium; and a coil layer for inducing a recording magnetic field in the lower core layer and the upper core layer. Alternatively, a thin film magnetic head further includes a first magnetic material layer in the rear of the lower shielding layer, magnetically separated from the lower shielding layer. A method of fabricating the same is also disclosed.

Abstract: A photo-setting and thermosetting resin composition comprises (I) a partial adduct of epoxy resin with unsaturated aliphatic acid, (II) (meth)acrylates, (III) a photocrosslinking agent, (IV) liquid epoxy resin, and (V) a latent curing agent. The resin composition can be easily charged and plugged into a through-hole, does not drip down, and can be effectively photo-set and thermoset. A photo-set product prepared of the resin composition can be easily polished. A plugged-through-hole printed wiring (substrate) board prepared of the resin composition does not cause defects such as hollows, cracks, blisters, peelings and so on, is excellent in solder-resistance, does not corrode a metal part, and can produce an appliance of high reliability and long life which does not occur short circuit and poor electrical connection.

Abstract: The invention provides a spin valve thin film element in which output characteristics and the stability of reproduced waveforms are improved, asymmetry is decreased, and the occurrence of side reading is prevented. The spin valve thin film element includes a lamination having an antiferromagnetic layer, a first pinned magnetic layer, a nonmagnetic intermediate layer, a second pinned magnetic layer, a nonmagnetic conductive layer, a free magnetic layer, and a backed layer composed of a nonmagnetic conductive material, which are laminated on a substrate. Hard bias layers are formed on both sides of the lamination, and orient the magnetization direction of the free magnetic layer in the direction crossing the magnetization direction of the second pinned magnetic layer. Electrode layers are formed on the hard bias layers to supply a sensing current J to the lamination. The electrode layers are formed to extend to the surface of the lamination toward the central portion from both sides of the lamination.

Abstract: In a thin-film magnetic head having a multilayered film developing a magnetoresistive effect, which is present between an upper shielding layer and a lower shielding layer both formed above an AlTiC substrate, a recess for defining the lower shielding layer is formed in an underlayer present on a surface of the AlTiC substrate, and a lower shielding layer made of NiFe is provided in the recess. A SiO2 film is interposed between the underlayer and the lower shielding layer.

Abstract: A track width regulating section having a track width, which is smaller than the resolution obtained by the wavelength of the light used for exposure and development of a resist, is formed between a lower core layer and an upper core layer. Since the width of the upper core layer is larger than the track width, magnetic saturation can be effectively reduced. Inclined faces are formed on the upper surface of the lower core layer so as to be inclined in directions away from the track width regulating section, thereby adequately preventing write fringing.

Abstract: An inorganic insulation underlying layer and an organic insulation underlying layer are formed on a lower core layer behind a recording region. Also, a coil layer is formed on the organic insulation underlying layer. Therefore, the withstand voltage between the lower core layer and the coil layer can be improved.

Abstract: A main magnetic pole layer is formed on an insulating layer flattened into a high-flatness surface, and a yoke layer having a large film thickness is formed on the main magnetic pole layer independently of the main magnetic pole. The main magnetic pole layer has a front end surface formed in a shape with a width size gradually increasing in a direction of track width as the front end surface departs farther away from an auxiliary magnetic pole layer. A perpendicular magnetic recording head can be provided which can suppress the occurrence of fringing in a recording pattern, and can form the main magnetic pole layer with high pattern accuracy, and can satisfactorily introduce a recording magnetic field to a fore end of the main magnetic pole layer.

Abstract: The present invention proves a thin film magnetic head including bumps capable of securing high conductivity, and a method of manufacturing the thin film magnetic head. The thin film magnetic head includes a coil layer for inducing a recording magnetic field between lower and upper core layers, a lead conductor layer for supplying a current to the coil layer, a conductive protective layer deposited on the lead conductor layer, a conductive bump formed on the conductive protective layer, and an insulating protective layer formed around the conductive protective layer and the conductive bump. The insulating protective layer includes a first insulating protective sub-layer formed around the conductive protective layer, the surface thereof being coplanar with the surface of the conductive protective layer, and a second insulating protective sub-layer formed separately from the first insulating protective sub-layer after the conductive bump is formed.

Abstract: The thermosetting resin composition which is valuable for an undercoat of a printed wiring board, and does not leave an air bubble in a cured film, and makes the surface polishing easy and can form a smooth printed wiring board comprises (I) an adduct of epoxy resin with unsaturated aliphatic acid, (II) a (meth) acrylate, (III) a radical polymerization initiator, (IV) a crystallizable epoxy resin, and (V) a latent curing agent.

Abstract: A method for fabricating a thin film magnetic head is disclosed. A nonmagnetic gap layer is formed on a lower gap layer. A first insulating layer is formed on a first part of the nonmagnetic gap layer. A second part of the nonmagnetic gap layer not covered with the first insulating layer is a magnetic gap formation section, which is part of a tip region. A coil layer and a second insulating layer are formed on the first insulating layer. A first underlying layer composed of a magnetic material extending from the nonmagnetic gap layer inside the tip region is formed over the second insulating layer. A first magnetic material layer is formed on the first underlying layer outside the tip region. The first underlying layer is removed from inside the tip region. A nonmagnetic material layer extending from the nonmagnetic gap layer is formed over the first magnetic layer.

Abstract: In a method for making a thin-film magnetic head, a primary insulating layer is formed on a lower core layer. An auxiliary insulating layer is formed on the primary insulating layer. A groove defining a track width is formed on the primary insulating layer. Sloping faces are formed in the auxiliary insulating layer. The sloping faces are symmetrically formed and converge toward the lower core layer in the track width direction. The resulting groove has a width which is smaller than the resolution of a resist layer in a reactive ion etching process.

Abstract: A magnetoresistive-effect device includes a multilayer film, hard bias layers arranged on both sides of the multilayer film, and electrode layers respectively deposited on the hard bias layers. The electrode layers are formed, extending over the multilayer film. Under the influence of the hard bias layers arranged on both sides of the multilayer, the multilayer film, forming the magnetoresistive-effect device, has, on the end portions thereof, insensitive regions which exhibit no substantial magnetoresistive effect. The insensitive region merely increases a direct current resistance. By extending the electrode layers over the insensitive regions of the multilayer film, a sense current is effectively flown from the electrode layer into the multilayer film. With a junction area between the electrode layer and the multilayer film increased, the direct current resistance is reduced, while the reproduction characteristics of the device are thus improved.

Abstract: A magnetoresistive-effect device includes a multilayer film, hard bias layers arranged on both sides of the multilayer film, and electrode layers respectively deposited on the hard bias layers. The electrode layers are formed, extending over the multilayer film. Under the influence of the hard bias layers arranged on both sides of the multilayer, the multilayer film, forming the magnetoresistive-effect device, has, on the end portions thereof, insensitive regions which exhibit no substantial magnetoresistive effect. The insensitive region merely increases a direct current resistance. By extending the electrode layers over the insensitive regions of the multilayer film, a sense current is effectively flown from the electrode layer into the multilayer film. With a junction area between the electrode layer and the multilayer film increased, the direct current resistance is reduced, while the reproduction characteristics of the device are thus improved.

Abstract: A polymer electrolyte comprising an electrolyte salt, a non-aqueous solvent and a polymer which comprises repeating units of the formulas: —(R1—O)n—, and —[CH (R2)—CH2—O]m— in which n≧0 and m≧0 provided that n+m≧5, R1 is a C1-C6 alkyl group, and R2 is a C1-C6 alkyl group or a benzyl group, and a urea structure.

Abstract: An electrode material for an electrochemical capacitor having a large capacity, having a titanium oxide compound such as titanium oxide, hydrated titanium oxide or their hydrogenated products, and at least one oxidizable and reducible metal element contained in the titanium oxide compound.

Abstract: A thin-film magnetic head having a magnetoresistive effect element wherein an insulating layer is formed under an electrode layer of a magnetoresistive effect element with a lower gap layer interposed therebetween. As a result, the distance between the electrode layer and the lower shielding layer becomes longer, thus permitting maintenance of a satisfactory electrical insulation.

Abstract: By forming a step in a lower core layer, the distance between the upper surface of a Gd-defining layer and the lower core layer is changed stepwise. Consequently, the distance between an upper magnetic pole layer formed on the upper surface of the Gd-defining layer and the lower core layer is small in the front region of the lower core layer, and thus a leakage magnetic field from the upper magnetic pole layer is absorbed by the lower core layer and is not applied to a recording medium.

Abstract: A thin-film magnetic head has a second lower core layer sandwiched between a magnetic pole laminate, which is formed of a lower magnetic pole layer, a gap layer, and an upper magnetic pole layer laminated in this order from bottom to top, and a first lower core layer. Unlike a conventional thin-film magnetic head, this thin-film magnetic head does not include a gap depth defining layer. This arrangement makes it possible to easily form the magnetic pole laminate into a substantially rectangular shape, and solves the problems with the conventional thin-film magnetic head attributable to the presence of the gap depth defining layer, the problems being typically represented by a curved gap layer or a reduced volume of the upper magnetic pole layer. Thus, the intensity of a recording magnetic field in the vicinity of a gap can be stabilized and increased, allowing the manufacture of thin-film magnetic heads capable of successfully achieving narrower tracks.

Abstract: A method for making a thin-film magnetic head with a magnetoresistive layer having a desired shaped to facilitate narrowing of the track width, wherein the surface, in the depth direction, is not curved, and wherein the shape and magnetic anisotropy of each sublayer of the magnetoresistive layer is stabilized to ensure improved reading characteristics.