Fujitsu Corporation

Junichi Kane

Hitoshi Kanai

Kenichi Aoshima

Yoshifumi Mizoshita

Kenji Noma

Takao Koshikawa

Yuji Uehara

Yukinori Ikegawa

Yoshinori Otsuka

Yoshinori Ohtsuka

Jongill Hong

Michiaki Kanamine

Junzo Toda

Mitsumasa Okada

Kenichiro Yamada

Naoki Mukoyama

Eiichi Kanda

Ken'ichiro Yamada

Eiji Shimizu

Ken-ichi Aoshima

Hong Jongill

A magnetoresistive spin-valve sensor is constructed to include a magnetic layer, a specular layer made of a metal oxide, a back layer made of Au, Cu, AuCu, AgCu, AuAgCu or an alloy thereof and interposed between the magnetic layer and the specular layer, and a metal layer disposed adjacent to the specular layer, opposite to the back layer, and made of a metal which improves GMR performance of the magnetoresistive spin-valve sensor.

Magnetoresistive spin-valve sensor and magnetic storage apparatus

The present invention provides a method for producing a magnetic head whose reproduction waveform has small distortions, and forming a hard magnetism layer for applying a bias magnetic field to a magnetoresistive element, which is a multilayer film including a fixed magnetic layer having magnetization fixed to a first direction and a free magnetic layer having an easy axis of magnetization that is directed to a second direction, is formed in an area including at least one of a front area in the first direction and a rear area in the first direction.

Magnetic head producing method

There is disclosed a magnetoresistive film in which increase of a coupling field accompanying thickness reduction of a middle layer is inhibited. The magnetoresistive film is a multilayered film including a pinned layer having magnetization whose direction is fixed, a nonmagnetic middle layer formed on the pinned layer, and a free layer formed on the middle layer and provided with magnetization whose direction changes in accordance with an external magnetic field, the magnetoresistive film indicates a magnitude of resistance in accordance with an angle formed by the magnetization direction of the pinned layer and the magnetization direction of the free layer, and a copper oxide layer of an oxide including a copper element is formed directly on the free layer, or on the free layer via an oxide layer of a material fabricated by oxidizing a material constituting the free layer.

Magnetoresistive film, magnetoresistive head, information regeneration apparatus and magnetoresistive film manufacture method

A spin-valve magnetoresistive head having end parts of a free magnetic layer insensitive to an external magnetic field so as to improve sensitivity is provided. The spin-valve magnetoresistive head includes, at least on the terminal part sides, a lamination formed of a first antiferromagnetic layer, a soft magnetic layer, an antiparallel coupling intermediate layer, and a first free magnetic layer.

Spin-valve magnetoresistive head, and composite-type magnetic head and magnetic recording medium drive using the same

A spin-valve magnetoresistive sensor includes a free layer of a ferromagnetic material, a pinned layer provided on the free layer and a pinning layer of an anti-ferromagnetic material provided on the pinned layer, the anti-ferromagnetic material being an ordered alloy containing manganese. The pinned layer includes a first pinned layer of a ferromagnetic material, a second pinned layer of a ferromagnetic material provided on the first pinned layer and an intermediate layer interposed between the first and second pinned layers such that the first and second pinned layers establish a super-exchange interaction in an anti-parallel manner. The second pinned layer has a magnetic moment smaller than a magnetic moment of the first pinned layer.

Spin-valve magnetoresistive sensor and magnetic head having such a spin-valve magnetoresistive sensor

A magnetoresistive transducer includes a multilayer provided with a first soft magnetic layer, a conductive nonmagnetic layer, a second soft magnetic layer, and a biasing magnetic layer giving a magnetization of a predetermined direction to the second soft magnetic layer, in that order of superposition. The first soft magnetic layer is a multilayer superposed structure including a (Co.sub.y Fe.sub.100-y).sub.100-x Z.sub.x alloy layer where Z represents boron and x and y represent atomic fractions (at %), and an alloy layer containing at least Ni and Fe. The (Co.sub.y Fe.sub.100-y).sub.100-x Z.sub.x alloy layer ofthe first soft magnetic layer borders on the nonmagnetic layer and has a face-centered cubic lattice structure with a d spacing smaller than a d spacing of a Co.sub.y Fe.sub.100-y alloy. A pair of electrodes are formed on the multilayer for allowing a sense current to pass through the multilayer.

Magnetoresistive transducer including CoFeZ soft magnetic layer

A method for manufacturing a spin valve GMR head is describe in which a fixed magnetic layer of the head may maintain magnetization in a desired orientation. In one aspect of the invention, the method comprises steps of: forming a magnetic film including at least a free magnetic layer, a non-magnetic metallic layer, a fixed magnetic layer, and a magnetic domain control layer; subjecting the magnetic film to a first heat treatment under a magnetic field to enhance magnetic anisotropy of the free magnetic layer; and subjecting the magnetic film to a second heat treatment under a magnetic field and at a higher temperature than the maximum temperature applied in the processes that precede the second heat treatment, to fix the magnetization in the fixed magnetic layer. In anther aspect of the invention, the method comprises steps of: forming a magnetic film including a free magnetic layer, a non-magnetic metallic layer, a fixed magnetic layer, and a magnetic domain control layer; subjecting the magnetic film to a first heat treatment under a magnetic field to fix the magnetization in the fixed magnetic layer; subjecting the magnetic film to a second heat treatment under a magnetic field to enhance magnetic anisotropy of the free magnetic layer; and subjecting the magnetic film to a third heat treatment in the absence of an externally applied magnetic field.

Spin valve magnetoresistive head and manufacturing method therefor

The present invention relates to a magnetoresistive head capable of converting a change in a magnetic field generated by a magnetic recording medium into a change in electric resistivity by utilizing spin valve magnetoresistance effect to read signal information. The magnetoresistive head comprises a first magnetic layer, a second magnetic layer formed on the first magnetic layer through a first nonmagnetic metal layer and magnetized in one direction, a third magnetic layer formed on the second magnetic layer through a second nonmagnetic metal layer, and an electric current supplying layer for applying a constant current to at least the third magnetic layer, the second nonmagnetic metal layer and the second magnetic layer in one of the same direction as and the opposite direction to the direction of magnetization of the second magnetic layer.

Magnetoresistive head with spin valve configuration

Magnetoresistive head and magnetic recording apparatus

A magneto-resistive head is provided with a substrate, a lower shield layer made of a Fe-system magnetic material and provided above the substrate, and a non-magnetic insulator layer provided above the lower shield layer. The non-magnetic insulator layer has a function of suppressing deterioration of surface roughness of the lower shield layer when subjected to an annealing process under a magnetic field in order to improve magnetic characteristics of the lower shield layer to desired magnetic characteristics.

Magneto-resistive head and method of producing the same

A magneto-resistive (MR) head has an MR layer in a space formed by shield layers by providing a distance enough to protect magnetic flux, flowing through the MR layer from a recording medium through a gap formed by the shield layers, from leaking out to the shield layers. A flux guide is provided between the MR layer and the gap, and has an end magnetically connected to the MR, extending over an effective area of the MR head, and another end having a width a little narrower than a width of track of the recording medium. A side of the MR layer, opposite to the side connected with the flux guide layer is placed in a narrow space formed at a corner of the space. Magnetic flux leaked from the gap due to a sense current flowing through the MR layer is eliminated by making a current flow through a recording coil layer or through an electrically conductive layer placed in the space.

Horizontal type magneto-resistive head using flux guide

A magnetoresistive head comprises a magnetoresistive layer having an axis of easy magnetization in the direction parallel to an air bearing surface, a first electrode formed on the magnetoresistive layer on the air bearing surface side and an oblique side portion with respect to the air bearing surface, and a second electrode formed to be separated at a distance from the first electrode and having a side portion substantially parallel to the oblique side portion of the first electrode on the magnetoresistive layer.

Magnetoresistive head and magnetic recording/reproducing apparatus

A magneto-resistive (MR) head has an MR layer in a space formed by shield layers by providing a distance enough to protect magnetic flux, flowing through the MR layer from a recording medium through a gap formed by the shield layers, from leaking out to the shield layers. A flux guide is provided between the MR layer and the gap and has an end magnetically connected to the MR extending over an effective area of the MR head, and another end having a width a little narrower than a width of track of the recording medium. A side of the MR layer, opposite to the side connected with the flux guide layer is placed in a narrow space formed at a corner of the space. Magnetic flux leaked from the gap due to a sense current flowing through the MR layer is eliminated by making a current flow through a recording coil layer or through an electrically conductive layer placed in the space.

Growing community of inventors

Kawasaki, Japan

Junichi Kane