Headway Technologies, Incorporated

Tdk Corporation

Kabushiki Kaisha Toshiba

Agilent Technologies, Inc.

Kenichi Takano

Yuchen Zhou

Joe Smyth

Moris Musa Dovek

Xuhui Jin

Erhard Theodor Schreck

Yuta Saito

Hiraku Hirabayashi

Kunliang Zhang

Yoshitaka Sasaki

Tsuyoshi Umehara

Tobias Maletzky

Lijie Guan

Hiroyuki Ito

Kazuki Sato

Po-Kang Wang

Cherng-Chyi Han

Masanori Sakai

Min Li

Shigeki Tanemura

Masashi Shiraishi

Isamu Sato

Haruyuki Morita

Yukinori Ikegawa

Kowang Liu

Tsutomu Aoyama

Izumi Nomura

Liejie Guan

Zhigang Bai

Chyu-Jiuh Torng

Yan Wu

Glen A Garfunkel

Yunfei Li

Joseph Francis Smyth

Kentaro Harada

Masayuki Takagishi

Hironori Araki

Tomohito Mizuno

Akihiko Takeo

Tomomi Funayama

Masahiro Takashita

Makoto Moriya

Weihao Xu

Suguru Watanabe

Kazumasa Yasuda

Satoshi Tomikawa

Matteo Staffaroni

Hideo Mamiya

Dayu Zhou

Hisao Kakitani

Yiu Liu

A magnetic sensor is provided that can attenuate a magnetic field in a direction that is perpendicular to the magnetic field detecting direction at a higher rate than the magnetic field in the magnetic field detecting direction. Magnetic sensorhas: first soft magnetic layer; a pair of second soft magnetic layersA,B that is positioned at a location that is different from first soft magnetic layerin the Z direction of first soft magnetic layer; and magnetic field detecting elementthat is positioned between first soft magnetic layerand second soft magnetic layersA,B in the Z direction, wherein magnetic field detecting elementhas a magnetic field detecting direction that is parallel to a direction in which the pair of second soft magnetic layersA,B is arranged. As viewed in the Z direction, second soft magnetic layersA,B are positioned on both sides of a center of first soft magnetic layer, and magnetic field detecting elementis positioned inside of a periphery of first soft magnetic layer

Magnetic sensor

A magnetic sensor comprises a magnetoresistive effect element including a first side surface and a second side surface facing in opposite directions along a first axis and a first end surface and a second end surface facing in opposite directions along a second axis substantially orthogonal to the first axis. The sensor has a sensitivity axis extending in a direction of the first axis, a first yoke unit provided adjacent to the first side surface of the magnetoresistive effect element, and a first bias magnetic field generation unit provided adjacent to the first end surface of the magnetoresistive effect element. The first bias magnetic field generation unit is provided to be capable of applying a bias magnetic field on the magnetoresistive effect element and the first yoke unit.

Magnetic sensor, and a current sensor and position detection device using a magnetic sensor

A magnetic sensor whose output characteristic is less sensitive to the environmental temperature is provided. Magnetic sensorhas free layerwhose magnetization direction changes in response to an external magnetic field, pinned layerwhose magnetization direction is fixed with respect to the external magnetic field, spacer layerthat is located between pinned layerand free layerand that exhibits a magnetoresistance effect, and at least one magnet filmthat applies a bias magnetic field to free layer. The film thickness of the magnet film is 15 nm or more and 50 nm or less. The relationship of 0.7&#x2264;T/T&#x2264;1.05 is satisfied, where Tis Curie temperature of the magnet film, and Tis Curie temperature of the free layer.

A magnetic field detection device of an embodiment of the disclosure includes: a first magnetic field detection element having a first resistance value increasing upon application of a first magnetic field in a first direction and decreasing upon application of a second magnetic field in a second direction; and a second magnetic field detection element having a second resistance value decreasing upon application of the first magnetic field and increasing upon application of the second magnetic field. The first and second magnetic field detection elements each include first and second magneto-resistive effect films coupled in series. The first magneto-resistive effect film has a first major-axis direction inclined at a first inclination angle relative to the first direction. The second magneto-resistive effect film has a second major-axis direction inclined at a second inclination angle relative to the first direction. The magnetic field detection device satisfies conditional expressions (1) and (2).

Magnetic field detection device

A current sensor has: a magneto-resistive effect element which is arranged near a current line, to which a signal magnetic field is applied, the signal magnetic field being is induced by a current that flows in the current line, and which generates a magneto-resistive change in accordance with a change of the signal magnetic field; cancelling magnetic field generating means that is provided near the magneto-resistive effect element and that generates a cancelling magnetic field that cancels the signal magnetic field; a first soft magnetic body that is provided between the magneto-resistive effect element and the current line; and a pair of second soft magnetic bodies that are provided on both sides of the magneto-resistive effect element with regard to a magnetization detecting direction of the magneto-resistive effect element.

Current sensor having soft magnetic bodies for adjusting magnetic field intensity

A current sensor includes a magnetic sensor device. The magnetic sensor device includes a magnetic sensor, a first magnetic layer, and a second magnetic layer in non-contact with the first magnetic layer. The magnetic sensor, the first magnetic layer, and the second magnetic layer are disposed across a virtual straight line and arranged in this order in a direction parallel to the virtual straight line. Different portions of magnetic flux generated by a current to be detected pass through the magnetic sensor, the first magnetic layer, and the second magnetic layer.

Magnetic sensor device and current sensor

Magnetic sensorhas MR elementsA toA that are connected to each other. MR elementsA toA belongs either to group Gin which electric resistance increases when the magnetization direction of each free layeris rotated a predetermined angle in a same direction, or to group Gin which the electric resistance decreases when the magnetization direction of each free layeris rotated the predetermined angle in the same direction. A variation of an output of magnetic sensordue to an increase of the electric resistance of the electric resistance elements of one group and a variation of the output of magnetic sensordue to a decrease of the electric resistance of the electric resistance elements of another group are cancelled out.

A magnetic sensor whose output characteristic is less sensitive to the environmental temperature is provided. Magnetic sensorhas free layerwhose magnetization direction changes in response to an external magnetic field, pinned layerwhose magnetization direction is fixed with respect to the external magnetic field, spacer layerthat is located between pinned layerand free layerand that exhibits a magnetoresistance effect, and at least one magnet filmthat is disposed on a lateral side of free layerand that applies a bias magnetic field to free layerA relationship of 0.7 &#x2264;T/T&#x2264;1.05 is satisfied, where Tis Curie temperature of the magnet film, and Tis Curie temperature of the free layer.

An offset estimation unit determines an estimate of an offset of a detection value to be output from a magnetic sensor. The offset estimation unit includes an initial function storing unit, a function settlement unit, and an estimate determination unit. The initial function storing unit stores an initial function for determining the estimate according to a first variable and a second variable, with a reference offset as the first variable and temperature as the second variable, the reference offset being the offset at a reference temperature. The function settlement unit settles a value of the first variable of the initial function by the reference offset, and turns the initial function into an estimate determination function for determining the estimate according to a value of the second variable. The estimate determination unit determines the estimate by settling the value of the second variable of the estimate determination function by temperature information.

Offset estimation apparatus and method, correction apparatus for magnetic sensor, and current sensor

An optically shielded TAMR (thermally assisted magnetic recording) write head has a metal waveguide blocker formed against a distal end of a waveguide and a pair of symmetrically disposed optical side shields formed to either side of a plasmon generator formed above the waveguide. The waveguide focuses optical radiation on the adjacent plasmon generator where it excites plasmon modes that heat the recording medium with near-field energy and the waveguide blocker prevents excess optical radiation from blurring the spot on the recording region. The optical side shields further restrict loosely coupled optical radiation from reaching the recording region and blurring the optical spot and improves down-track and cross-track thermal gradients.

Thermally-assisted magnetic recording head having symmetric optical side shields

A magnetic head includes a coil, a main pole and a return path section. The return path section is located on the trailing side relative to the main pole so that a space is defined between the main pole and itself. The coil includes a first winding portion and a second winding portion connected in series. The first winding portion extends to pass through the aforementioned space, and extends once around the entire perimeter of the main pole as viewed from the medium facing surface. The second winding portion does not pass through the aforementioned space, and surrounds only a part of the entire perimeter of the main pole as viewed from the medium facing surface.

Magnetic head for perpendicular magnetic recording with a coil including a first winding portion of one turn and a second winding portion of less than one turn

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Cupertino, CA, United States of America

Kenichi Takano