Showa Denko K.k.

Resonac Corporation

Showa Denko Kabushiki Kaisha

Daizo Endo

Akira Sakawaki

Sho Tonegawa

Tatsunori Shino

Yasumasa Watanabe

Masato Fukushima

Satoru Nakamura

Shin-ichi Ogawa

Taining Hung

Evance Kuo

Hiroyuki Tomita

Hiroshi Osawa

Haruhisa Ohashi

Shun Matsumoto

Tomoyuki Noguchi

Yuta Miyamoto

A magnetic sensor includes: a substrate; and a sensitive portion disposed on the substrate and having a longitudinal direction and a transverse direction. The sensitive portion senses a magnetic field by a magnetic impedance effect. The sensitive portion includes a soft magnetic material layer composed of a soft magnetic material having uniaxial magnetic anisotropy in a direction intersecting the longitudinal direction and sensing the magnetic field. The sensitive portion also includes a secondary soft magnetic material layer laminated between the substrate and the soft magnetic material layer. The secondary soft magnetic material layer is composed of a soft magnetic material with large saturation magnetization compared to the soft magnetic material constituting the soft magnetic material layer.

Magnetic sensor, method of manufacturing magnetic sensor, and sensitive element assembly

A magnetic sensor includes: a non-magnetic substrate; and a sensitive elementhaving a longitudinal direction and a short direction, provided with uniaxial magnetic anisotropy in a direction crossing the longitudinal direction, and sensing a magnetic field by a magnetic impedance effect, wherein the sensitive elementincludes plural soft magnetic material layerstoand plural non-magnetic material layerstoconfigured with a non-magnetic material and laminated between the plural soft magnetic material layersto, and the soft magnetic material layerstofacing each other with each of the non-magnetic material layerstointerposed therebetween are antiferromagnetically coupled.

Magnetic sensor

A magnetic sensor includes: plural sensitive elementseach including a soft magnetic material layerhaving a longitudinal direction and a transverse direction and a conductor layer having higher conductivity than the soft magnetic material layerand extending through the soft magnetic material layerin a longitudinal direction, the sensitive elementhaving uniaxial magnetic anisotropy in a direction intersecting the longitudinal direction and being configured to sense a magnetic field by a magnetic impedance effect; and a connecting portioncontinuous with the conductor layer of the sensitive element and configured to connect transversely adjacent sensitive elementsin series.

Magnetic sensor and method for manufacturing magnetic sensor

In a magnetic sensor using a magnetic impedance effect, sensitivity is improved as compared to the case where a width of a sensitive element in the short direction is equal from one end to the other end in the longitudinal direction. The magnetic sensor includes: a non-magnetic substrate; and a sensitive element that is provided on the substrate, composed of a soft magnetic material, having a longitudinal direction and a short direction, provided with uniaxial magnetic anisotropy in a direction crossing the longitudinal direction, having a width at a center portion in the longitudinal direction that is smaller compared to a width at each of both end portions in the longitudinal direction, and sensing a magnetic field by a magnetic impedance effect.

A magnetic sensor () includes: a nonmagnetic substrate (); and a sensitive element () including a plurality of soft magnetic layers () (lower soft magnetic layer () and upper soft magnetic layer ()) laminated on or above the substrate () and a conductor layer () laminated between the plurality of soft magnetic layers () and having higher conductivity than the plurality of soft magnetic layers (). The sensitive element () has a longitudinal direction and a transverse direction and has uniaxial magnetic anisotropy in a direction intersecting the longitudinal direction. The sensitive element () is configured to sense a magnetic field by a magnetic impedance effect.

Magnetic sensor and magnetic sensor manufacturing method

A magnetic sensorincludes: a non-magnetic substrate; and a sensitive elementdisposed on the substrate. The sensitive elementhas a longitudinal direction and a transverse direction and has a uniaxial magnetic anisotropy in a direction intersecting the longitudinal direction. The sensitive elementis configured to sense a magnetic field by a magnetic impedance effect. The sensitive elementincludes a soft magnetic material layermade of an amorphous alloy based on Co and having a saturation magnetization of greater than or equal to 300 emu/cc and less than or equal to 650 emu/cc.

The sensitivity of a magnetic sensor using a sensitive element sensing a magnetic field by the magnetic impedance effect is increased. The magnetic sensor includes: a sensitive element sensing a magnetic field by a magnetic impedance effect; and a focusing member provided to face the sensitive element, configured with a soft magnetic material, and focusing magnetic force lines from outside onto the sensitive element.

It is aimed at improving sensitivity of a magnetic sensor using the magnetic impedance effect. A magnetic sensor includes: a non-magnetic substrate; and a sensitive element including a soft magnetic material layer composed of an amorphous alloy with an initial magnetic permeability of 5,000 or more, the soft magnetic material layer being provided on the substrate, having a longitudinal direction and a short direction, being provided with uniaxial magnetic anisotropy in a direction crossing the longitudinal direction, and sensing a magnetic field by a magnetic impedance effect.

Reduction of the S/N in an output from a magnetic sensor using the magnetic impedance effect is suppressed. A magnetic sensoris provided with a sensitive elementincluding: plural soft magnetic material layers; and a nonmagnetic amorphous metal layerprovided between the plural soft magnetic material layers, wherein the soft magnetic material layersfacing each other with the nonmagnetic amorphous metal layerinterposed therebetween are antiferromagnetically coupled to sense a magnetic field by a magnetic impedance effect.

A magnetic sensorincludes: a nonmagnetic substrate; a sensitive elementlaminated on the substrate, the sensitive elementbeing made of a soft magnetic material, the sensitive elementhaving a longitudinal direction and a transverse direction and having uniaxial magnetic anisotropy in a direction intersecting the longitudinal direction, the sensitive elementbeing configured to sense a magnetic field by a magnetic impedance effect; and a pair of thin-film magnetslaminated on the substrateand disposed to face each other in the longitudinal direction across the sensitive element, the pair of thin-film magnetsbeing configured to apply a magnetic field in the longitudinal direction of the sensitive element

A method of manufacturing a magnetic sensor includes: a soft magnetic material layer deposition process depositing a soft magnetic material layer () constituting a sensitive part () sensing a magnetic field on a substrate () by magnetron sputtering; and a sensitive part formation process forming the sensitive part () sensing the magnetic field in a portion of the soft magnetic material layer () where uniaxial magnetic anisotropy is provided by a magnetic field used for magnetron sputtering of the soft magnetic material layer ().

Method of manufacturing magnetic sensor and magnetic sensor assembly

A magnetic sensorincludes: a thin film magnetwhich is constituted by a hard magnetic material layerand has magnetic anisotropy in an in-plane direction; and a sensitive partincluding a sensitive elementsensing a magnetic field by a magnetic impedance effect, the sensitive elementbeing constituted by a soft magnetic material layerlaminated on the hard magnetic material layer, having a longitudinal direction and a short direction, and having uniaxial magnetic anisotropy in a direction intersecting the longitudinal direction, in which the longitudinal direction faces in the direction of a magnetic field generated by the thin film magnet. The thin film magnetand the sensitive elementare provided to constitute a magnetic circuit with a facing member provided outside to face one of magnetic poles of the thin film magnet

Magnetic sensor, measuring device and method of manufacturing magnetic sensor

A magnetic sensoris provided with: a thin film magnetconfigured with a hard magnetic material and having magnetic anisotropy in an in-plane direction; a sensitive partincluding a sensitive elementconfigured with a soft magnetic material and disposed to face the thin film magnet, the sensitive elementhaving a longitudinal direction in which a magnetic flux generated by the thin film magnetpasses through and a short direction, having uniaxial magnetic anisotropy in a direction crossing the longitudinal direction, and sensing a change in a magnetic field; and a control layerdisposed on a side of the thin film magnetopposite to a side of the thin film magneton which the sensitive elementis provided, the control layercontrolling the magnetic anisotropy of the thin film magnetto be directed in the in-plane direction.

Magnetic sensor and method of manufacturing magnetic sensor

The present invention relates to a magnetic recording medium in which a lubricant layer contains a compound A represented by general formula (1) and a compound B represented by general formula (2), satisfying (A/B)=0.2 to 3.0, and has an average thickness of 0.8 nm to 2 nm. R&#x2014;CHOCHCH(OH)CHOCH&#x2014;R&#x2014;CHOCHCH(OH)CHOH . . . (1) (Ris an alkoxy group having 1 to 4 carbon atoms. Ris &#x2014;CFO(CFCFO)(CFO)CF&#x2014; (x, y=0 to 15), &#x2014;CFCFO(CFCFCFO)CFCF&#x2014; (z=1 to 15), &#x2014;CFCFCFO(CFCFCFCFO)CFCFCF&#x2014; (n=0 to 4). HOCHCFCFO(CFCFCFO)CFCFCHOCHCH(OH)CHOH . . . (2) (m is an integer).

Magnetic recording medium and magnetic recording/reproducing apparatus

A magnetic recording mediumin which the outermost surface of a protective layeron a lubricant layerside contains carbon and nitrogen of 10 atomic % to 90 atomic %, the lubricant layeris formed by being in contact with the outermost surface, and contains a compound A of Formula (1) and a compound B of Formula (2), a mass ratio (A/B) of the compound A with respect to the compound B is 0.2 to 0.3, the average molecular weights of the compounds A and B are 1,500 to 2,000 and 1,300 to 2,400, respectively, and the average film thickness is 0.5 nm to 2 nm.R1-CHOCHCH(OH)CHOCH&#x2014;R2-CHOCHCH(OH)CHOH &#x2003;&#x2003;(1)

Growing community of inventors

Ichihara, Japan

Daizo Endo