Showa Denko K.k.

Tohoku University

Haruhisa Ohashi

Tetsuya Kanbe

Lei Zhang

Takayuki Fukushima

Hisato Shibata

Takehiro Yamaguchi

Yuji Murakami

Gohei Kurokawa

Kota Hasegawa

Ken Inoue

Kenji Shimizu

Kazuya Niwa

Daizo Endo

Shin Saito

Tomoo Shige

Tatsunori Shino

Shintaro Hinata

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

Magnetic sensor and magnetic sensor manufacturing method

A magnetic recording medium includes a non-magnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protective layer arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer from the non-magnetic substrate side in this order. The second magnetic layer contains a magnetic grain and provided farthest from the non-magnetic substrate. The first magnetic layer has a granular structure that contains an oxide in a grain boundary. The second magnetic layer has a granular structure that contains a nitride of an element contained in the magnetic grain in a grain boundary.

Magnetic recording medium with nitride segregant, method for manufacturing same and magnetic recording and reproducing apparatus

A magnetic recording medium includes a non-magnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protective layer arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer from the non-magnetic substrate side in this order. The second magnetic layer contains a magnetic grain and provided farthest from the non-magnetic substrate. The first magnetic layer has a granular structure that contains an oxide in a grain boundary. The second magnetic layer has a granular structure that contains a carbide of an element contained in the magnetic grain in a grain boundary.

Magnetic recording medium, with carbide segregant, method for manufacturing same and magnetic recording and reproducing apparatus

A magnetic recording medium includes: a substrate; a first underlayer; a second underlayer; and a magnetic layer including an alloy having a L1type crystal structure with a (001) orientation. The substrate, the first underlayer, the second underlayer, and the magnetic layer are stacked in this order. The first underlayer is a crystalline layer that includes Mo as a main component. The second underlayer is a crystalline layer that includes a material containing Mo as a main component and that includes an oxide. The content of the oxide in the second underlayer is in a range of from 2 mol % to 30 mol %. The oxide is an oxide of one or more kinds of elements selected from a group consisting of Cr, Mo, Nb, Ta, V, and W.

Magnetic recording medium and magnetic storage apparatus

A magnetic recording medium includes: a substrate; a first underlayer; a second underlayer; and a magnetic layer including an alloy having a L1type crystal structure with a (001) orientation. The substrate, the first underlayer the second underlayer, and the magnetic layer are stacked in this order. The first underlayer is a crystalline layer that includes W as a main component. The second underlayer is a crystalline layer that includes a material containing W as a main component and that includes an oxide. The content of the oxide in the second underlayer is in a range of from 2 mol % to 30 mol %. The oxide is an oxide of one or more kinds of elements selected from a group consisting of Cr, Mo, Nb, Ta, V, and W.

A magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having a L1type crystal structure whose plane orientation is (001). The substrate, the underlayer, and the magnetic layer are stacked in this order. The underlayer includes a first underlayer. The first underlayer is a crystalline layer that includes a material containing Al, Ag, Cu, W, or Mo as a main component element and includes an oxide of the main component element, a content of the oxide of the main component element in the first underlayer being in a range of from 2 mol % to 30 mol %.

A magnetic recording medium includes a substrate, a barrier layer, a crystal grain size control layer, and a magnetic layer that are arranged in this order. The barrier layer includes at least one of oxides, nitrides, and carbides, and the crystal grain size control layer is a crystalline layer including Ag and having an average thickness in a range of 0.1 nm to 1 nm. The barrier layer makes contact with the crystal grain size control layer, and the magnetic layer includes an alloy having a L1crystal structure and a (001) face orientation.

A method of manufacturing a magnetic recording medium, includes at least: forming an orientation control layerthat controls orientation of an immediately above layer thereof on a non-magnetic substrate; and forming a perpendicular magnetic layerin which an easy axis of magnetization is mainly perpendicularly orientated to the non-magnetic substrate, in which the forming of the orientation control layerincludes forming a granular layer having a granular structure that includes Ru or a material in which Ru is a main component and an oxide having a melting point which is greater than or equal to 450&#xb0; C. and less than or equal to 1000&#xb0; C., by a sputtering method, and the forming of the perpendicular magnetic layerincludes growing crystal grains to form columnar crystals that are continuous in a thickness direction together with crystal grains that form the orientation control layer

Method of manufacturing magnetic recording medium, magnetic recording medium, and magnetic recording and reproducing apparatus

A method for manufacturing a magnetic recording medium is provided. An orientation control layer is deposited on a non-magnetic substrate to control an orientation of a layer located directly thereon, and a perpendicular magnetic layer whose easy axis of magnetization is mainly oriented perpendicular to the non-magnetic substrate is deposited thereon. In depositing the orientation control layer, a first granular structure layer containing Ru or a material mainly made of Ru and a first oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering. In depositing the perpendicular magnetic layer, a second granular structure layer containing magnetic particles and a second oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering, and the magnetic particles are grown so as to form a columnar crystal continuing in a thickness direction. The columnar crystal includes crystal grains constituting the orientation control layer.

Growing community of inventors

Chiba, Japan

Haruhisa Ohashi