Kabushiki Kaisha Toshiba

Toshihiko Ohta

Hitoshi Iwasaki

Yuichi Ohsawa

Junichi Akiyama

Reiko Kondoh

Hiroaki Yoda

Kohichi Tateyama

Kazuyoshi Fuse

Toshiaki Sato

Fumio Izawa

Shoji Tsutaki

Masayuki Shinozaki

Kunio Ohmi

The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films, a nonmagnetic film sandwiched between the magnetic films, and leads connected to the magnetoresistance effect element wherein the width of one of the magnetic films, which essentially responds to a signal magnetic field, is not more than a distance between leads. The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films and a nonmagnetic film sandwiched between the magnetic films, which makes use of a change in magnetic resistance caused by spin-dependent scattering, wherein at least a portion of one magnetic films, which essentially respond to a signal magnetic field extends in a direction same as that of the signal magnetic field.

Thin film head

The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films, a nonmagnetic film sandwiched between the magnetic films, and leads connected to the magnetoresistance effect element wherein the width of one of the magnetic films, which essentially responds to a signal magnetic field, is not more than a distance between leads. The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films and a nonmagnetic film sandwiched between the magnetic films, which makes use of a change in magnetic resistance caused by spin-dependent scattering, wherein at least a portion of one magnetic films, which essentially respond to a signal magnetic field, extends in a direction same as that of the signal magnetic field.

Thin film magnetic head responsive to spin-dependent scattering

A member having a first and a second magnetic layer are magnetostatically coupled and laminated and the first magnetic layer formed on a magneto-resistive element, for creating the exchange coupling on the magneto-resistive element and the first magnetic layer. The member is formed by sequentially laminating a first ferromagnetic layer magnetized in a sense along the direction of the longitudinal bias of the magneto-resistive element, non-magnetic layer and second ferromagnetic layer magnetized in a direction opposite to the magnetized direction of the first ferromagnetic layer, for example.

Magneto-resistive head

A magnetoresistance sensor of this invention is designed to detect a magnetic field on the basis of a change in electric resistance of a magnetoresistance layer, and includes a substrate, the magnetoresistance layer, a magnetization stabilizing layer for stabilizing magnetization of the magnetoresistance layer, and an electrical conductive layer formed on the magnetoresistance layer or the magnetization stabilizing layer. The sensor is characterized in that the magnetoresistance layer and the magnetization stabilizing layer are stacked on each other such that the layers are magnetically coupled to each other at their two end regions with an exchange coupling force higher than that at the remaining region. With this arrangement, there is provided a magnetoresistance sensor having high sensitivity, which can apply a desired bias magnetic field to the MR layer while preventing the bias magnetic field from being disturbed by a magnetic field from a magnetic recording medium or the like.

Magnetoresistance sensor magnetically coupled with high-coercive force

In a magnetic head a metal magnetic layer and a non-magnetic layer are sequentially formed on a pair of magnetic cores in which track widths are formed by a predetermined pitch. The metal magnetic layer and the non-magnetic layer formed outside the track widths are removed while leaving the track widths formed in said magnetic cores, thereby forming a regulation groove. The track widths of one magnetic core from which the metal magnetic layer and the non-magnetic layer are removed are caused to oppose those of the other magnetic core. Glass as an adhesive is filled in the regulation groove and melted to bond the magnetic cores so that a gap having the metal magnetic layer is formed. The pair of magnetic cores bonded to form the gap therebetween are cut by a predetermined pitch to form a magnetic head.

Method of manufacturing magnetic head

A transducer for an IC card having a built-in semiconductor memory performs signal conversion by magnetic coupling to read out data. This transducer comprises a substrate, which has a first section of a predetermined thickness, and a second section, thinner than and formed in contact with the first section. A pair of first thin-film spiral coils, both would in the same direction, are formed on the first section of the substrate, and thin-film connection pads, respectively coupled to the first spiral coils, are formed on the second section. Then, an insulating film is deposited on the substrate and the first spiral coil. Through holes are made in the insulating film, thus exposing the center portion of the first spiral coil. A pair of second thin-film spiral coils, both also would in the same direction, are formed on the insulating film such that they are coupled to the first spiral coils. An anisotropic conductive film, for supplying a signal from the memory, is coupled to the pads by means of the through holes.

Transducer for converting a signal to read out data and method for

A thin-film type electromagnetic transducer formed on a nonmagnetic substrate by a thin-film forming process. The transducer includes a magnetic core formed on the substrate by the thin-film forming process, and a conductor coil formed on the substrate by the thin-film forming process, so as to be wound around the core. The core is shaped so that a leakage flux generated along the plane of the substrate is greater than that generated in a direction intersecting with the plane of the substrate, the leakage fluxes being generated from the core when a current is supplied to the coil. In a method for transferring signals from the thin-film type electromagnetic transducer described above, a magnetic head is located so as to face that region of the core of the transducer where the maximum leakage flux is generated. The magnetic head has a magnetic gap such that the direction of a leakage flux generated in the gap is coincident with that of the maximum leakage flux from the core, and whereby magnetic signals are transferred between the magnetic head and the maximum-leakage-flux generating region of the core.

Thin-film electromagnetic transducer

A data card which can be resiliently flexed to a degree. The data card includes a laminated structure member having at least a synthetic resin protective layer and a ferromagnetic material layer, an electric circuit device embedded in the laminated structure member and an electro-magnetic transducer having a pair of coils which are formed on the laminated structure member. The pair of coils are coupled to the electric circuit device for generating magnetic fluxes of opposite directions with each other according to an information signal applied from the electric circuit device. Alternatively, the pair of coils are provided for receiving magnetic fluxes of opposite directions with each other and coupled to the electric circuit device for applying an electric signal generated by the magnetic fluxes of opposite directions thereto.

Growing community of inventors

Yokohama, Japan

Toshihiko Ohta