Abstract: Embodiments in accordance with the present invention provide a trailing side shield around a main pole and control the gap length on its trailing side to high accuracy so as to increase a recording magnetic field gradient. An etching signal layer is provided on a main pole, and the gap length on the trailing side of the main pole is controlled to high accuracy by stopping ion milling when a signal from this layer is detected.

Abstract: Embodiments in accordance with the present invention provide a magnetic head in which broadening of the write-field distribution in the track-width direction can be decreased without reducing the write-field intensity. A main pole includes a pole tip having a part which provides the write track-width and a yoke part recessed from the air bearing surface in the element height direction, the pole tip including at least two magnetic films having different track-width directions, and the throat height at the trailing side being made smaller than the throat height at the leading side.

Abstract: Embodiments in accordance with the present invention provide a magnetic head in which broadening of the effective track width can be decreased without reducing the write-field intensity and a variation of the track width can be decreased. A main pole consists of a pole tip having a part which provides the write track-width and a yoke part recessed from the air beating surface in the element height direction, and the pole tip consists of a pole tip at the trailing side where the width in the track-width direction is large and a pole tip at the leading side where the width in the track width direction is small. Moreover, the throat height of the pole tip at the trailing side is made greater than the throat height of the pole tip at the leading side.

Abstract: Embodiments in accordance with the present invention relate to methods wherein when a main pole is processed by using an ion milling technique, a re-adhesion layer created on the side face of the resist mask is removed with certainty. In one embodiment, an inorganic insulator from 5 nm to 100 nm which is soluble in an alkaline is arranged between the main pole material and a mask for processing the main pole material, and the main pole is processed by ion milling. After this process, the mask is peeled off, a surface treatment is performed by using an alkaline solution, resulting in the re-deposition film being removed.

Abstract: Embodiments of the invention reduce the TPR (thermal protrusion phenomenon) of a perpendicular magnetic write head caused by a coil current and a static temperature. In one embodiment, SiO2 having a low coefficient of thermal expansion and high workability is used as a coil insulator. SiO2 is arranged at a position away from the air bearing surface and the air bearing surface is made of alumina, making slider processing easy.

Abstract: Embodiments of the invention provide a magnetic head which can suppress broadening of the magnetic field distribution in the track-width direction without reducing the magnetic field intensity. In one embodiment, a main pole is composed of a pole tip having a part providing a write-track width, and a yoke part recessed from the air bearing surface in the element-height direction, where the trailing side surface of the pole tip is made as an asymmetric structure with respect to the track center.

Abstract: Embodiments of the invention provide a magnetic disk device which lowers the cost, maintains reliability by compensating the thermal dent or protuberance caused by a change in the environmental temperature, makes it possible to increase the recording density by decreasing the floating amount of the slider, to increase the capacity of the device or to decrease the size thereof. In one embodiment, a magnetic disk device comprises a magnetic disk, a magnetic head slider, and a drive unit for moving the magnetic head slider, wherein an air stream is generated between the magnetic disk that rotates and the magnetic head slider to effect the recording or the reproduction in a state where the magnetic head slider is floating. The magnetic head slider includes a slider substrate portion and a thin-film head portion that has recording and reproducing elements, a metal film, and an insulating film formed on the slider substrate portion and constituting a slider-floating plane along with the slider substrate portion.

Abstract: A magnetic head for perpendicular recording in which a reduction of an interval between a main pole and a read element is attained by suppressing the phenomenon due to a magnetic field from the main pole entering a read shield and thereby output of the read head being varied. In one embodiment, the shield nearer the main pole of the read head is formed in the three-layer structure of the magnetic layer/non-magnetic layer/magnetic layer.

Abstract: Disclosed herein is a magnetic head for perpendicular recording in which the main magnetic pole has reduced remanent magnetization and is less liable to cause erasure after recording. These characteristic properties were realized by constructing the magnetic head such that the recording magnetic pole and the yoke are separate from each other and the main magnetic pole is formed from a material with a high saturation magnetic flux density and the yoke is formed from a material having a negative magnetostriction constant.

Abstract: A magnetic field distribution of a recording head is made linear so that a curvature of the magnetic-transition pattern in recording bit cells can be corrected. In a SPT head having a main pole 1 and an auxiliary pole 3, a magnetic layer 32 is disposed on a trailing side of the main pole. The magnetic layer is provided with a protruding portion 32a protruding towards the main pole. A width Nw of a side of the protruding portion opposite the main pole of the protruding portion is made smaller than a width Tww of the main pole on the trailing side.

Abstract: Embodiments of the invention secure a sufficiently large magnetic field, and deter a protrusion phenomenon of a perpendicular magnetic recording head, causing a problem in implementing a low flying height, while solving problems such as erasure of information in peripheral tracks. In one embodiment, a main pole or a stacked body made up of the main pole, and an auxiliary pole is deposited over an underlayer formed on a substrate so as to be in contact with the underlayer. On top of the main pole or the stacked body, there is deposited a coil, a return pole, and a read element in that order, thereby fabricating a perpendicular magnetic recording head.

Abstract: Embodiments of the invention provide a magnetic head which assures an improved format efficiency without increase in the magnetic field intensity applied at a read element. In one embodiment, a magnetic head incorporates a write head having a main pole and an auxiliary pole, and a read head having a read element between reader shields. An auxiliary shield as a magnetic body is provided between the main pole and reader shields or on the opposite side of the main pole with the reader shields between the main pole and the auxiliary shield.

Abstract: Embodiments of the invention are directed to narrowing a read/write gap of a perpendicular magnetic head by applying a wrap around shield, data erasing from return pole edges by returning recording field, and reducing TPR of a magnetic material. In one embodiment, the wrap around shields are formed by partitioning and making Gd, which is the height of the shield at the main pole side in the sensor height direction, smaller than the height of the shield connected to the return pole in the sensor height direction.

Abstract: In a magnetic disk device, cost reduction is designed by improving productivity, and increase in recording density and increase in capacity of the device or size reduction are designed with reliability being ensured. In one embodiment, a magnetic disk device has a magnetic disk arranged rotatably, a magnetic head slider arranged in a manner of facing a surface of the magnetic disk, and a driving device for moving the magnetic head slider in a radial direction of the surface of the magnetic disk. The magnetic head slider has a silicon slider-substrate-portion and a thin-film head portion which is formed on the slider substrate portion using a thin-film process and forms an air-bearing surface along with the slider substrate portion.

Abstract: Embodiments of the invention reduce the throat height of a single pole type head with high accuracy. In one embodiment, a head with an electro lapping guide for controlling a write head's throat height during air bearing surface processing is made. Air bearing surface processing is performed using the electro lapping guide. For a read head, processing is performed using the read head itself or an electro lapping guide for the read head so that both the throat height of write head and the element height of read head are controlled.

Abstract: A magnetic head includes a main pole having a first portion with a length (W1) in a cross-track direction which continuously increases from a leading edge side to a trailing edge side, a second portion formed on a trailing edge side of the first portion, and a third portion formed on a trailing edge side of the second portion. A length (W2) in the cross-track direction of a boundary line between the second portion and the third portion is longer than W1, and a length (W3) in the cross-track direction of a trailing edge of a third portion is substantially equal to W2.

Abstract: A magnetic head includes a main pole having a first portion with a length (W1) in a cross-track direction which continuously increases from a leading edge side to a trailing edge side, a second portion formed on a trailing edge side of the first portion, and a third portion formed on a trailing edge side of the second portion. A length (W2) in the cross-track direction of a boundary line between the second portion and the third portion is longer than W1, and a length (W3) in the cross-track direction of a trailing edge of a third portion is substantially equal to W2.

Abstract: Embodiments of the invention provide a thin film magnetic recording head that can reduce the round portion of the track restriction part of the main pole and has excellent track width accuracy, as well as its fabrication method. In one embodiment, the main pole is etched in the following three processes. (1) An ion beam is injected into the substrate at an angle of about 50°±20° while vibrating the substrate horizontally within a range of about ±(30° to 150°) in a reference direction in which the ion beam is oriented from the medium to the air bearing surface. (2) The ion beam is injected into the substrate at an angle of about 60°±20° while vibrating the substrate around a predetermined angle of about 90° to 135° from a direction in which the ion beam is oriented from the medium to the air bearing surface.

Abstract: Embodiments of the invention provide a write head for perpendicular recording in which the magnetic field intensity applied at a read element is reduced with larger write-field gradients and the distance between a write element and a read element is small. In one embodiment, a pair of magnetic bodies for shielding a read element are provided on the leading and trailing sides of the read element respectively and whichever one of the two shields is the longer in the length from the air bearing surface is shorter than the length up to the back contact position PBK at which a main pole and an auxiliary pole are connected.

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.