Nec Corporation

Denso Corporation

Hiroaki Honjo

Nobuyuki Ishiwata

Tamaki Toba

Shinsaku Saito

Tsutomu Ishi

Mikiko Saito

Yoshihiro Nonaka

Keishi Ohashi

Kazuhiko Hayashi

Masafumi Nakada

Eizo Fukami

Kiyokazu Nagahara

Junichi Fujikata

Shigeru Mori

Atsushi Kamijo

Kunihiko Ishihara

Hisanao Tsuge

Shinsaku Saitho

Shinsaku Saitoh

Yoshihino Nonaka

Sinsaku Saitoh

A magnetic random access memory includes a substrate; a first ferromagnetic layer; a magnetic tunnel junction (MTJ) device provided on a same side of the substrate as the first ferromagnetic layer; and a wiring layer provided between the first ferromagnetic layer and the MTJ device. The MTJ device includes a second ferromagnetic layer opposing to the wiring layer. A first perpendicular projection of the first ferromagnetic layer on the substrate and a second perpendicular projection of the second ferromagnetic layer on the substrate are different in area, and one of the first and second perpendicular projections contains the other.

Magnetic random access memory and method of manufacturing the same

A recording head is a magnetic head in which ends on one side of opposed first and second magnetic cores form a recording gap, said other ends form a magnetic joint, coils insulated by an insulating material are provided between said first and second magnetic cores, magnetic fluxes of said first and second magnetic cores excited by said coils leak from said recording gap so that recording onto a recording medium is carried out. In said recording head, a distance from said end of said recording gap close to said magnetic medium to a contact point of said magnetic joint (hereinafter, yoke length) is not more than 20 &#x3bc;m. A magnetic recording/reproduction apparatus has this head.

Recording head, recording head manufacturing method, combined head and magnetic recording/reproduction apparatus

The present invention provided a thin-film electromagnet including a magnetic yoke and a thin-film coil, characterized in that the magnetic yoke includes a first magnetic yoke and a second magnetic yoke making contact with the first magnetic yoke, the first magnetic yoke is located at a center of a winding of the thin-film coil, and the second magnetic yoke is arranged above or below the thin-film coil such that the second magnetic yoke faces the thin-film coil, and overlaps at least a part of the thin-film coil.

Thin film electromagnet and switching device comprising it

By inserting a first antistripping layer comprising a first non-magnetic layerand a first conductive layerbetween a first magnetic layerand a magnetic separation layer, adhesion between the first conductive layerand the magnetic separation layeris improved to prevent the first magnetic layerfrom stripping. In addition, by inserting a second antistripping layer comprising a second non-magnetic layerand a second conductive layerbetween a second magnetic layerand a magnetic gap layer, adhesion between the second conductive layerand the magnetic gap layeris improved to prevent the second magnetic layerfrom stripping.

Magnetic head having an antistripping layer for preventing a magnetic layer from stripping

A magnetoresistive effect sensor uses a shielded-type magnetoresistive effect element using a magnetoresistive effect film formed by a basic configuration of a combination of a free layer, a barrier layer formed on the free layer, and a fixed layer formed on the barrier layer, wherein a sensing current flows substantially perpendicular to the magnetoresistive effect film, and wherein an amorphous material or a microcrystalline material is used in a lower shield.

Magnetoresistive effect sensor with barrier layer smoothed by composition of lower shield layer

A recording head is a magnetic head in which ends on one side of opposed first and second magnetic cores form a recording gap, said other ends form a magnetic joint, coils insulated by an insulating material are provided between said first and second magnetic cores, magnetic fluxes of said first and second magnetic cores excited by said coils leak from said recording gap so that recording onto a recording medium is carried out. In said recording head, a distance from said end of said recording gap close to said magnetic medium to a contact point of said magnetic joint (hereinafter, yoke length) is not more than 20 &mgr;m. A magnetic recording/reproduction apparatus has this head.

By inserting a first antistripping layer comprising a first non-magnetic layer and a first conductive layer between a first magnetic layer and a magnetic separation layer adhesion between the first conductive layer and the magnetic separation layer is improved to prevent the first magnetic layer from stripping. In addition, by inserting a second antistripping layer comprising a second non-magnetic layer and a second conductive layer between a second magnetic layer and a magnetic gap layer adhesion between the second conductive layer and the magnetic gap layer is improved to prevent the second magnetic layer from stripping.

A magnetic material includes a main component expressed by a general formula CoNiFeX, wherein X is at least one element selected from the group consisting of Cr, Ti, V, Ru, Rh, Pd, Os, Ir and Pt, and wherein weight percentages a, b, c and d of Co, Ni, Fe and X contents, respectively, in the main component are such that 40%&lE;a&lE;10%, 5%&lE;b&lE;20%, 10%&lE;c&lE;30%, and 0%<d&lE;10%.

Magnetic material having a high saturation magnetic flux density and a low coercive force

In a production process of an MR head using the tunnel junction film basically consisting of a free layer, a barrier layer, and a pinned layer, the resistance between the free layer and the pined layer reduced beforehand and increased afterward up to a resistance value necessary when actually used. While the resistance between the free layer and the pinned layer is low, current can easily flow, suppressing charge up, thus preventing insulation destruction of the barrier layer. This significantly increases a production yield of a recording/reproduction head using a ferromagnetic tunnel junction element.

Magnetoresistive head production method

A magnetic head and a manufacturing method of the magnetic head and a magnetic recording and reproducing apparatus used this head, in which the following problem is solved, are provided. A plated film realizing large saturation magnetization Bs about 2T can not realize a high resistivity at the same time, therefore, when this plated film is applied to a magnetic head, the high frequency characteristic is deteriorated. This problem is solved at the present invention. Further, the present invention provides a magnetic head that is low cost and has large saturation magnetization Bs, and has a excellent high frequency characteristic suitable for a high density recording. A magnetic head, in which a coil insulated by insulation layers is disposed between a first magnetic core for recording and a second magnetic core for recording that is disposed to face the first magnetic core for recording via a recording gap, and which executes recording by that a magnetic flux of the first and second magnetic cores for recording excited by the coil is generated from the recording gap, is provided. And at least one of the first and second magnetic cores for recording is composed of a first plated magnetic layer and a second plated magnetic layer in a state that the first plated magnetic layer is disposed at the near side of the recording gap, and saturation magnetization of the first plated magnetic layer is 1.7 T (tesla) or more. And when resistivity of the first plated magnetic layer is defined as &rgr; and the thickness of the first plated magnetic layer is defined as &dgr; , and resistivity of the second plated magnetic layer is defined as &rgr; , and the thickness of the second plated magnetic layer is defined as &dgr; , and &dgr;

Magnetic head and manufacturing method thereof and magnetic recording and reproducing apparatus

A magnetic material includes a main component expressed by a general formula CoNiFeX, wherein X is at least one element selected from the group consisting of Cr, TI, V, Ru, Rh, Os, Ir and Pt, and wherein weight percentages a, b, c and d of Co, Ni, Fe and X contents, respectively, in the main component are such that 40%&lE;a&lE;75%, 5%&lE;b&lE;20%, 10%&lE;c&lE;30%, and 0%&lE;d&lE;10%.

A magnetoresistance element includes a lower electrode layer, a magnetoresistance effect layer, an upper electrode layer and a lower electrode anti-erosion/flaking layer. The lower electrode anti-erosion/flaking layer, which is formed before a photoresist layer remaining on the patterned lower electrode layer is removed, is formed around the lower electrode layer so that its edge facing the lower electrode layer will be in contact with the edge of the lower electrode layer. By use of the lower electrode anti-erosion/flaking layer, the edge of the lower electrode layer is protected from being exposed to a release agent containing a dissolved photoresist in a photoresist layer removal step (when the photoresist layer remaining on the patterned lower electrode layer is removed), thereby the increase of roughness of the edge of the lower electrode layer due to erosion/flaking of the edge in the photoresist removal step can be avoided, and thereby electrical shorts between the upper electrode layer and the lower electrode layer can be eliminated, and thereby a magnetoresistance element of high sensitivity and high performance can be obtained and manufacturing yield of the magnetoresistance elements can be improved.

Magnetoresistance element, with lower electrode anti-erosion/flaking layer

Disclosed is a magnetic heads suitable for high density recording which comprises an ID head where a CoNiFe film or a CoNiFeX film is formed by a physical vapor deposition method and further a plated film of CoNiFe etc. is formed while avoiding vanishment of a seed layer. The ID head shows high reliability and high production efficiency. The upper magnetic pole of the ID head is composed of a laminated layers of a first magnetic layer of a CoNiFe film or a CoNiFeX film which is formed by a physical vapor deposition method, a second magnetic layer of NiFe layer composing a seed layer laminated thereon, and a third magnetic layer of CoNiFe plated film etc. further laminated on the second layer.

Magnetic head, method for making the same and magnetic recording/reproducing device using the same

In a thin film magnetic head including a substrate, a plurality of organic insulating layers, and a plurality of winding layers alternating with the organic insulating layers, a lead terminal formed by an extension of an uppermost one of the winding layers is covered by two upper ones of the organic insulating layers. An edge of the uppermost one of the two upper organic insulating layers on the lead terminal is outside of an edge of the other beneath the lead terminal.

Growing community of inventors

Tokyo, Japan

Hiroaki Honjo