Hitachi Metals, Ltd.

Toa Nenryo Kogyo Kabushiki Kaisha

Asahi Kogaku Kogyo Kabushiki Kaisha

Toa Nenryo Kogyo, K. K.

Shigeo Fujii

Hisato Tokoro

Shuji Okano

Takashi Mikami

Tokuzo Ikeda

Shoichi Mori

Yasushi Kaneko

Juro Endo

Jyoichi Tabuchi

Shiro Murakami

Masayuki Nakao

Shin Noguchi

Takashi Nakabayashi

Satoshi Meguro

Koji Ichikawa

Hiroyuki Aoyama

Tadashi Shinohara

Tsutomu Iimura

Sumiaki Tsuru

Masayuki Gonda

Kenji Miyasaka

Noriko Komatsu

Yoshio Igarashi

Hiroyuki Mima

Masao Yoshizawa

Shigeru Oguma

Noriaki Nakayama

Yoshikazu Yoshida

Kazufumi Egawa

Minoru Hirano

Toshihiro Ifuka

Takeo Oku

A method for producing coated, fine metal particles each having a Ti oxide coating and a silicon oxide coating formed in this order on a metal core particle by mixing powder comprising TiC and TiN with oxide powder of a metal M meeting the relation of &#x394;G&#x3e;&#x394;G, wherein &#x394;Grepresents the standard free energy of forming an oxide of the metal M; heat-treating the resultant mixed powder in a non-oxidizing atmosphere to reduce the oxide of the metal M with the powder comprising TiC and TiN, while coating the resultant metal M particles with Ti oxide; coating the Ti-oxide-coated surface with silicon oxide; and classifying the resultant particles such that they have a median diameter d50 of 0.4-0.7 &#x3bc;m, and a variation coefficient (=standard deviation/average particle size) of 35% or less, which indicates a particle size distribution range. Coated, fine metal particles each having a Ti oxide coating and a silicon oxide coating formed in this order on a metal core particle, which has a median diameter d50 of 0.4-0.7 &#x3bc;m, and a variation coefficient (=standard deviation/average particle size) of 35% or less, which indicates a particle size distribution range.

Coated, fine metal particles comprising titanium oxide and silicon oxide coating, and their production method

Fine composite metal particle comprising a metal core and a coating layer of carbon, and being obtained by reducing metal oxide powder with carbon powder.

Fine composite metal particles and their production method, micro-bodies, and magnetic beads

A method for producing coated, fine metal particles comprising the steps of mixing powder comprising TiC and TiN with powder of an oxide of a metal M meeting the relation of &#x394;G&#x3e;&#x394;G, wherein &#x394;Grepresents the standard free energy of formation of metal M oxide, and heat-treating the resultant mixed powder in a non-oxidizing atmosphere to reduce the oxide of the metal M with the powder comprising TiC and TiN, while coating the resultant metal M particles with Ti oxide, and coated, fine metal particles each comprising a metal core particle and a Ti oxide coating and having a carbon content of 0.2-1.4% by mass and a nitrogen content of 0.01-0.2% by mass.

Coated, fine metal particles comprising specific content of carbon and nitrogen, and their production method

A magnetic material antenna using a ferrite sintered body comprising one or more conductors disposed at least on a surface or in internal portion of the ferrite sintered body, wherein the ferrite sintered body is a sintered body of Y-type ferrite containing BaO, CoO, and FeOas main components and wherein the ferrite sintered body contains Cu and, in a cross section for the sintered body, an area rate of a cubic Co-rich phase, which has a ration of an amount of Co being higher than a Y-type ferrite phase being a mother phase, is 1% or less.

Magnetic material antenna and ferrite sintered body

A method for producing fine, coated metal particles comprising the steps of mixing Ti-containing powder except for Ti oxide powder with oxide powder of a metal M, an M oxide having a standard free energy of formation meeting the relation of &#x394;G&#x3e;&#x394;G; and heat-treating the resultant mixed powder at a temperature of 650-900&#xb0; C. in a non-oxidizing atmosphere, thereby reducing the oxide of the metal M with Ti to provide the resultant fine particles of the metal M with TiO-based titanium oxide coating.

[object Object]

An inductive magnetic head used for high-density recording having such a construction that prevents magnetic leakage near a magnetic pole at the tip of the magnetic core and reduces magnetic resistance or reluctance at an upper magnetic core front portion is disclosed. An upper magnetic core facing a lower magnetic core with a non-magnetic gap layer interposed therebetween comprises an upper magnetic core front portion near a magnetic pole, and an upper magnetic core rear portion at the rear portion. The front portion has a parallel portion having a width almost equal to the track width extending from the magnetic pole toward the rear end of the front portion, and a sector at the rear of an apex. The front portion has a non-magnetic gap with the lower magnetic core at an area between the magnetic pole and the apex, and the gap between the front portion and the lower magnetic core is wider than the magnetic gap at the rear of the apex. The tip portion of the upper magnetic core rear portion is overlapped and connected to the upper magnetic core front portion on the medium-facing surface side of the apex, extending therefrom to the upper part of a coil and a coil insulating layer.

Magnetic head having separated upper magnetic cores for avoiding magnetic saturation and manufacturing method of same

A magnetoresistive film having a spin valve multi-layer structure has low electrical resistance and high sensitivity. In the magnetoresistive film, an under-layer, a first ferromagnetic layer, a non-magnetic layer, a second ferromagnetic layer, and an antiferromagnetic layer are laminated on a substrate in this order. The magnetization direction of the second ferromagnetic layer is fixed by the antiferromagnetic layer, and the magnetization direction of the first ferromagnetic layer is not fixed. The average grain size of the first ferromagnetic layer ranges from 8 to 14 nm.

Magnetoresistive film

The change rate of resistance in a multi-layered spin-valve magneto-resistive thin film using a FeMn anti-ferromagnetic layer has been improved. In multi-layered magento-resistive thin film having a first ferromagnetic layer, a non-magnetic layer and a second ferromagnetic layer with an adjoining anti-ferromagnetic layer are laminated on a substrate; the magnetizing direction of each ferromagnetic layer lying in the film surface; the magnetizing direction of the second ferromagnetic layer being pinned by the magnetic exchange coupling field generated by the anti-ferromagnetic layer; and the magnetizing direction of the first ferromagnetic layer not being pinned, the degree of dispersion of lattice spacing, or lattice relaxations at the interface of the second ferromagnetic layer and the anti-ferromagnetic layer is set to equal to or less than 0.5 A.

Multi-layered magneto-resistive thin film sensor

The invention discloses a magnetic recording medium used for recording and reproducing information in combination with a magnetic head. The magnetic recording medium in accordance with the present invention comprises a substrate made of a non-magnetic material, an underlayer which is formed on the substrate and has a thickness of 300 to 1000 .ANG. and which consists of a chromium metal or a chromium alloy, and a magnetic recording layer which is formed on the underlayer by vacuum evaporation, which consists essentially of 5 to 15 at% of Cr, 1 to 8 at% of Ta and the balance substantially being Co, and which has a direction of easy magnetization within the surface parallel to the surface of the substrate.

Longitudinal magnetic recording media with fine grain crystal magnetic

A nonwoven fabric consisting of water-soluble resin fine fibers having a mean fiber diameter of at most 30 .mu.m and a basis weight of 5 to 500 g/m.sup.2 is produced by extruding an aqueous solution containing a water-soluble resin or a melt of a water-soluble resin plasticized with water through nozzles, stretching the extruded material to form fibers by a high speed gas flow, heating the fibers to evaporate the water in the fibers and then collecting the fibers.

Nonwoven fabric of water-soluble resin fibers

A fibrous bone filler having an excellent biocompatibility. The bone filler comprises fibers containing hydroxyl apatite. The hydroxyl apatite is 'intact', that is, the hydroxyl apatite substantially retains its hydroxyl groups.

Fibrous bone filler and process of producing the same

A cell separator which can separate cells, especially lymphocytes, with high selectivity and high efficiency without changing the cell population ratio of the cells. The cell separator comprises fibrous material containing fibers including hydroxyl apatite.

Cell separator device

Growing community of inventors

Kumagaya, Japan

Shigeo Fujii