Tdk Corporation

Sae Magnetics (h.k.) Limited

Yosuke Antoku

Katsuki Kurihara

Norio Takahashi

Masashi Sano

Tsuyoshi Umehara

Man Tse

Kosuke Tanaka

Kazuki Sato

Hiroyuki Hirano

Takeo Kagami

Hiroshi Kiyono

Takayasu Kanaya

Kenkichi Anagawa

Taro Oike

Takumi Yanagisawa

Hideyuki Ukita

Teiichiro Oka

Eric Cheuk Wing Leung

Yoshikazu Sawada

Kenta Hara

Takayuki Nishizawa

Masaru Iida

Mutsumi Fujita

Kei Hirata

Atsushi Yamaguchi

Masahiro Saito

Naoki Ohta

Norikazu Ota

Kenzo Makino

Noboru Yamanaka

Tetsuro Sasaki

Shunji Saruki

Akimasa Kaizu

Takekazu Yamane

Tetsuya Kuwashima

Takumi Uesugi

Shingo Miyata

Hiroki Matsukuma

Masaya Kato

Tatsuhiro Nojima

Shuji Okame

Isamu Toba

Kazumi Nakatogawa

Luke Hung Leung Chung

Eric Leung

Luke Chung

A rotational angle detection device includes a magnet with n pole pairs (where n&#x2265;3) provided to be integrally rotatable with a rotating body; magnetic detection parts including first and second magnetic detection parts; a corrected signal generation part generating first and second corrected signals; and a rotational angle detection part detecting the rotational angle of the rotating body based on the first and second corrected signals. The waveform of the first and second detection signals have a phase difference of 90&#xb0; from each other. The corrected signal generation part adds the first sensor signals and adds the second sensor signals. The region at the perimeter of the magnet includes first through nth regions, and at least two of the first and second magnetic sensor parts are positioned in different regions from each other among the first through nth regions.

Rotational angle detection device

An angle sensor includes a first magnetic sensor that outputs a first signal, a second magnetic sensor that outputs a second signal, and a processor that performs processing for generating an angle detection value. The processing for generating the angle detection value includes first processing for determining a first candidate value of the angle detection value, second processing for performing processing for determining an (n+1)th candidate value either once or more than once while incrementing n in value by one each time, the (n+1)th candidate value being determined by performing second computing processing using the first and second signals, first and second strengths, and an nth candidate value of the angle detection value, where n is an integer of 1 or more, and third processing for assuming the candidate value last determined by the second processing as the angle detection value.

Angle sensor and angle sensor system

A position detection system includes a first magnet, a first soft ferromagnetic member, and a magnetic detector. The first magnet is magnetized in a first direction and generates a first magnetic field including a first magnetic line. The first soft ferromagnetic member is rectilinearly movable along a second direction and includes a first outer edge having a first outer edge part remote from the first magnet by a first distance in a third direction and a second outer edge part remote from the first magnet by a second distance in the third direction. The first and second outer edge parts are disposed at different positions in the second direction. The magnetic detector is kept at a predetermined constant position relative to the first magnet. The first magnetic line passes through the magnetic detector in the first direction when the first soft ferromagnetic member is at rest.

Position detection system

This thin film magnetic head includes a magnetic pole including an end surface exposed on an air bearing surface, and a contact detection section including a magnetic material layer provided near the air bearing surface, and a magnetic-domain stabilizing structure stabilizing a magnetic domain structure of the magnetic material layer.

Thin film magnetic head, head gimbals assembly, head arm assembly, and magnetic disk unit

This thin film magnetic head includes: a magnetic pole including an end surface exposed on an air bearing surface; and a heating element including a first branch and a second branch and configured to heat a vicinity of the magnetic pole. The first branch and the second branch each expand along a stacking surface and are coupled in parallel to each other. The stacking surface intersects the air bearing surface.

Thin film magnetic head, head gimbals assembly, head arm assembly, and magnetic disk unit with improved air bearing surface

This thin film magnetic head includes: a magnetic pole including a first end surface exposed on an air bearing surface; a coil configured to provide a magnetic flux passing through inside of the magnetic pole; and a heatsink including a second end surface that is provided at a position recessed from the air bearing surface. The second end surface is configured to suppress reflection causing light that has traveled through an entering position on the air bearing surface to return to the entering position.

A magnetic recording-reproducing head includes, on a support member, a first head section having a function of executing a recording process and having a function of executing a reproducing process, and one or more second head sections each having a function of executing an erasing process and having no function of executing a reproducing process.

Magnetic recording-reproducing head having different sections with different functions including an erase function

A magnetic head includes a main pole, a write shield, and a return path section. The write shield includes first and second shield portions located on opposite sides of the main pole in the track width direction. The return path section includes first and second yoke portions located on opposite sides of the main pole in the track width direction. The first yoke portion is connected to the first shield portion. The second yoke portion is connected to the second shield portion. A coil surrounds at least part of the entire outer periphery of the main pole when viewed from a medium facing surface.

Magnetic head for perpendicular magnetic recording having a write shield

A trailing shield is provided on a trailing side of a magnetic pole with a non-magnetic gap layer in between, and an intermediate layer having negative uniaxial magnetocrystalline anisotropy is provided between the non-magnetic gap layer and the trailing shield. The intermediate layer has a magnetic property in which an easy axis of magnetization is provided in an in-plane direction and thus magnetization is likely to occur in that direction, whereas a difficult axis of magnetization is provided in a direction intersecting the in-plane direction and thus magnetization is less likely to occur in that direction. Accordingly, magnetic flux becomes difficult to excessively flow from the magnetic pole into the trailing shield.

Perpendicular magnetic write head and magnetic recording device

The invention provides a method for fixing up the deterioration of a magneto-resistive effect device. A hard disk system is provided in it with a head heating means for heating a thin-film magnetic head, and by that head heating means, a defective site of the magneto-resistive effect device, which occurs as the hard disk system is in operation and is confined in a quasi-stable state, is fixed up in such a way as to return back to its own normal stable state. Thus, the deteriorated site of the magneto-resistive effect device (reproducing device) in the thin-film magnetic head, which is caused by the so-called thermal asperity as the hard disk system is in operation, is fixed up while it remains built in the hard disk system, i.e., without dismantling the hard disk system.

Method of repairing the deterioration of magneto-resistive effect device

A magnetic head includes a medium facing surface that faces a surface of a recording medium, a write head section, a contact sensor that detects contact of the medium facing surface with the surface of the recording medium, and a heat sink adjacent to the contact sensor. The write head section has a magnetic pole that produces a write magnetic field for writing data on the recording medium. The contact sensor and the heat sink have respective end faces located in the medium facing surface. The contact sensor varies in resistance in response to temperature variations, and is to be energized. The heat sink includes an intermediate layer made of a nonmagnetic metal material, and two ferromagnetic layers made of a metal-based magnetic material, the two ferromagnetic layers being disposed with the intermediate layer therebetween, and being antiferromagnetically exchange-coupled to each other via the intermediate layer.

Magnetic head having a contact sensor

A magnetic head slider includes a magnetic recording part and/or a reproducing part. The magnetic head slider includes a resistance film having temperature dependence of electrical resistance, the resistance film being positioned in the vicinity of an air bearing surface or on the air bearing surface, separately from the magnetic recording part and the reproducing part. The magnetic head slider further includes a first protective film with a smaller milling rate than the resistance film, the first protective film contacting a lower surface of the resistance film in a lamination direction of the magnetic head slider and on the air bearing surface, and/or a second protective film with a smaller milling rate than the resistance film, the second protective film contacting an upper surface of the resistance film in the lamination direction of the magnetic head slider and on the air bearing surface.

Magnetic head slider including protective film for head-to-medium spacing detecting element

A magnetic head disposed in a slider arranged with an interval with respect to a magnetic disk includes a sensor that is positioned in a stepped-back position from an air bearing surface facing the magnetic disk, an insulating film that is positioned on the air bearing surface and that covers the sensor; a pair of lead films, the lead films being electrically connected to the sensor such that at least portions of the lead films are exposed on the air bearing surface, and being configured to transfer a temperature change of the air bearing surface to the sensor.

Magnetic head including a thermal asperity effect element sensor in a stepped-back position from an air bearing surface

A magnetic head includes a reproducing element for reproducing information recorded on a magnetic recording medium, a recording element for recording information on the magnetic recording medium, and a heating resistor. The magnetic head has a magnetic medium-facing surface on which the reproducing element and the recording element are exposed. The magnetic head is obtained as follows:

Magnetic head with protective layer and a protective film removal method for the magnetic head

A magnetic head disposed in a slider, that is arranged at an interval from a magnetic disk includes a sensor disposed in a position that is opposed to the magnetic disk, a heat conductive film that is positioned on an air bearing surface opposed to the magnetic disk, and that is formed so as to overlap the sensor, of which a height in a direction perpendicular to the air bearing surface is more than a height of the sensor, and that transfers a temperature change of the air bearing surface to the sensor, and a pair of lead films electrically connected to the sensor and not electrically connected to the heat conductive film.

Magnetic head including sensor

Growing community of inventors

Tokyo, Japan

Yosuke Antoku