Sharp Kabushiki Kaisha Corporation

Tohru Kira

Mitsuhiko Yoshikawa

Kazuyoshi Imae

Tsuneo Nakamura

Kozi Otsuka

Tomohisa Komoda

Haruhiko Deguchi

Kengo Shiiba

Hidenori Yamasaki

Akiyoshi Fujii

Ryoji Minakata

Noboru Fujita

Takaya Nakabayashi

Hiroshi Suzuki

Atsuo Mukai

Kazuhiro Uneyama

A combined thin film magnetic head includes a first yoke magnetic head and a second type MR head a front gap is provided at a front end of the first yoke type MR head, and a second yoke type MR head is provided behind the first yoke type MR head. Consequently, the first yoke type MR head and the second yoke type MR head can be formed on the same substrate through the same process steps, and the number of manufacturing steps can be significantly reduced.

Combined thin film magnetic head formed over a substrate trench

A magnetoresistive effect device is formed by layering a nonmagnetic Co oxide film, a pinned magnetization layer made of Co, a nonmagnetic layer made of Cu, a free magnetization layer made of NiFe in this order on a substrate made of glass or Si. By arranging the nonmagnetic Co oxide film in contact with the pinned magnetization layer, it is possible to produce a magnetoresistive effect device with a high saturation field and a high sensitivity.

Magnetoresistive effect device utilizing an oxide layer adjacent one of

A magnetoresistance effect type thin film magnetic head includes a MR element having the electrical resistance changed according to a change in an applied signal magnetic field, a lead electrode for detecting a voltage change generated across the ends of the MR element in which a change in electrical resistance is generated, and high coercive force films for applying a weak magnetic field to the MR element. The high coercive force films are arranged in the proximity of the ends of the MR element and at a predetermined position between the ends. According to this structure, a weak magnetic field is applied in uniform over the entire MR element to facilitate unification of magnetic domain of the MR element even in the case of a long MR element. Therefore, unification of magnetic domain can easily be carried out over the entire region of the MR element without increasing the film thickness of the high coercive force film even in a case of a wide track width, resulting in a thin film magnetic head with no Barkhausen noise generation.

Magnetoresistance effect type thin film magnetic head using high

A thin film magnetic head includes yokes for leading magnetic flux of signals generated from a magnetic recording medium up to a magnetic resistance effect element. The yokes are made of sputtered films having internal compressive stress therein. The internal stress in the yokes which are deleterious to the magnetic properties of the magnetic resistance effect element can be negated or reduced by including a film of material on the yokes for compensating for the internal stresses.

Thin film magnetic head with reduced internal stresses

A thin film magnetic head includes first and second head chips, each of the head chips having a substrate, a reproducing head portion provided in a side edge portion on the substrate, and a protecting plate convering the reproducing head portion and the recording head portion. The reproducing head portion and the recording head portion are formed of a lower magentic layer, an electroconductive coil layer, an upper magnetic layer and insulation layers interposed therebetween, deposited in stacked relation on the substrate one after another. The first and second head chips are arranged in side-by-side relation and are inverted with respect to each other so that the recording head portion in the first head chip and the reproducing head portion in the second head chip form a recording/reproducing head portion for a first traveling direction of a magnetic recording medium, and the reprducing head portion in the first head chip and the recording head portion in the second head chip form a recording/reproducing head portion for a second or reverse traveling direction of the recording medium.

Method of forming a magnetic head chip for a thin film magnetic head

The yoke thin film magnetic head according to the present invention includes yokes for leading the magnetic flux of signals generated from the magnetic recording medium up to the magnetic resistance effect element, which yokes are made of sputtered films having compressive stress therein. Therefore, the internal stress in the yokes which cause bad influences upon magnetic properties of the magnetic resistance effect element can be negated or reduced, with less Barkhausen noises produced.

Yoke thin film magnetic head constructed to avoid Barkhausen noises

A thin film magnetic head includes first and second head chips, each of the head chips having a substrate, a reproducing head portion and a recording head portion provided in a side edge portion on the substrate, and a protecting plate covering the reproducing head portion and the recording head portion. The reproducing head portion and the recording head portion are formed of a lower magnetic layer, an electroconductive coil layer, an upper magnetic layer and insulation layers interposed therebetween, deposited in stacked relation on the substrate one after another. The first and second head chips are arranged in side-by-side relation and are inverted with respect to each other so that the recording head portion in the first head chip and the reproducing head portion in the second head chip being form a recording/reproducing head portion for a first travelling direction of a magnetic recording medium, and the reproducing head portion in the first head chip and the recording head portion in the second head chip form a recording/reproducing head portion for a second or reverse travelling direction of the recording medium.

Thin film magnetic head for a bidirectionally moveable recording medium

An improved process for producing a thin film magnetic head includes forming a nonmagnetic material layer over a lower magnetic core layer with an electrically conductive coil layer embedded in the nonmagnetic material layer. It further includes forming an upper magnetic core layer of a predetermined pattern by a specific method over the resultant to provide the thin film magnetic head.

Process for producing thin film magnetic head

A thin film magnetic head which comprises an end portion of a first yoke and an end portion of a second yoke confronting each other through a magnetic gap, and receiving from a recording surface or a recording medium, a magnetic signal, and a magnetic reluctance effect element disposed for magnetic coupling in the course of a magnetic path constituted by the first and second yokes. The thin film magnetic head is characterized in that the first yoke or magnetic reluctance effect element is formed on an application type SiO.sub.2 film which improves the surface roughness of the ground layer.

Thin film magnetic head with an application type silicon dioxide film

There is disclosed a process for modifying in an oxygen plasma an inert reaction product produced on a Fe-Al-Si alloy back core during a production of a thin film magnetic head utilizing a reactive ion etching (RIE) process. As a result of modifying the reaction product it is made readily soluble in and thus removable by water.

Production of thin film magnetic head

There provides a process for preparing a coil type thin film magnetic head having high density record by planarization differences in level caused by an electroconductive coil holded between upper and lower magnetic cores.

Growing community of inventors

Tenri, Japan

Tohru Kira