Hitachi Metals, Ltd.

Sumitomo Metal Industries, Inc.

Western Digital (fremont), Inc.

Read Rite Corporation

Sumitomo Special Metals Co., Ltd.

Read-rite Smi Corporation

Tomoki Fukagawa

Fuminori Hikami

Hideyasu Nagai

Hiroshi Nishida

Masateru Nose

Kazuhiro Nishikawa

Masaki Ueno

Naomitsu Mizui

Koichi Suzuki

Shigeki Nomura

Kazutoshi Kunishige

Fuminori Higami

Masanori Ueno

Nozomi Komatsubara

A rare-earth magnet includes a magnet body made of an R&#x2014;Fe&#x2014;B based rare-earth magnet material (where R is at least one rare-earth element) and a metal film that has been deposited on the surface of the magnet body. The magnet further includes a plurality of reaction layers between the magnet body and the metal film. The reaction layers include: a first reaction layer, which contacts with at least some of RFeB type crystals, included in the magnet body, to have received the rare-earth element that has been included in the RFeB type crystals; and a second reaction layer, which is located between the first reaction layer and the metal film and which has a lower rare-earth element concentration than that of the first reaction layer.

Rare earth magnet and method for producing same

A spin valve magnetoresistance sensor of a thin film magnetic head. In one embodiment, a spin valve magnetoresistance sensor is provided with a spin valve film, in which a base layer including a first base film of Ta or some other nonmagnetic metal and, on top of this, a second base film of an alloy represented by NiFeX (where X is at least one element selected from among Cr, Nb, Rh) is formed on a substrate, and on top of this are formed by layering a free magnetic layer and pinned magnetic layer arranged to enclose a nonmagnetic conductive layer, as well as an antiferromagnetic layer, the second base film has an fcc (face-centered cubic) structure and also has a (111) orientation.

Spin valve magnetoresistance sensor and thin film magnetic head

A dielectric ceramic composition wherein the dielectric constant &isin; is large, the temperature coefficient &tgr;f of the resonance frequency is close to 0, and which as a large Q value, is obtained by adding to and blending with a ceramic composition whose &tgr;f of the resonance frequency is large on the plus side a ceramic composition whose temperature coefficient &tgr;f is large on the minus side. In an Li O&mdash;R O &mdash;TiO -based composition, an improved dielectric constant &isin; can be achieved by introducing a specific quantity of Bi O , and &tgr;f can be shifted to the plus side and in addition a considerable improvement in Qf achieved by introducing a specific quantity of MO, where M is one or two of Ca and Sr. Furthermore, by introducing a specific quantity of Na O together with the MO (where M is one or two of CA and Sr), in particular in the case of material of &isin;r>150, it is possible to control &tgr;f to the vicinity of 0 while maintaining Qf at an high value.

Microwave dielectric ceramic composition

A spin-valve magnetic resistance sensor. In one embodiment, the spin-valve magnetic resistance sensor includes a pair of ferromagnetic layers with a non-magnetic layer sandwiched in between. The pair of ferromagnetic layers, the non-magnetic layer and an antiferromagnetic layer are laminated on a substrate. The antiferromagnetic layer is formed using an antiferromagnetic material which uses a Pt&mdash;Mn&mdash;X alloy, Ir&mdash;Mn&mdash;X alloy, Rh&mdash;Mn&mdash;X alloy, Ru&mdash;Mn&mdash;X alloy or Pd&mdash;Mn&mdash;X alloy. X indicates one or more elements selected from a set consisting of elements of groups IIA, IVA, VA, IIIB and IVB of the periodic table. X is in the range of 0.1 at % to 15 at %.

Spin-valve magnetic resistance sensor and thin-film magnetic head

The present invention provides a spin-valve magnetic resistance sensor in which an underlayer, which has a second underlayer film with an fcc structure consisting of an alloy formed by combining one or more elements selected from a set consisting of elements of group VIIIa and group Ib of the periodic table, and one or more elements selected from a set consisting of elements of groups IIa, IVa, Va, VIa, IIb, Ib and IVb of the periodic table, such as NiFeCrTi or NiCrTi, etc., is formed on the substrate, and a magnetic resistance (MR) film which has an antiferromagnetic layer consisting of a Pt,Mn,alloy or an Ir,Mn,alloy is laminated on top of this underlayer. The composition ratio of the element with the smallest free energy of oxide formation among the elements contained in the alloy of the second underlayer film is in the range of 0.1 atomic % to 15 atomic %.

A high tensile strength, hot or cold rolled steel sheet having improved ductility and hole expandability consists essentially, on a weight basis, of: C: 0.05-0.3%, Si: 2.5% or less, Mn: 0.05-4%, Al: greater than 0.10% and not greater than 2.0% wherein 0.5.ltoreq.Si(%)+Al(%).ltoreq.3.0, optionally one or more of Cu, Ni, Cr, Ca, Zr, rare earth metals (REM), Nb, Ti, and V, and a balance of Fe and inevitable impurites with N being limited to 0.01% or less. The steel sheet has a structure comprising at least 5% by volume of retained austenite in ferrite or in ferrite and bainite. A hot rolled steel sheet is produced by hot rolling with a finish rolling end temperature in the range of 780.degree.-840.degree. C., cooling to a coiling temperature in the range of 300.degree.-450.degree. C. either by rapid cooling to the coiling temperature at a rate of 10.degree.-50.degree. C./sec or by initial rapid cooling to a temperature range of 600.degree.-700.degree. C., then air-cooling for 2-10 seconds, and final rapid cooling to the coiling temperature. A cold rolled steel sheet is produced by hot rolling, cooling to a coiling temperature in the range of 300.degree.-720.degree. C., descaling, cold rolling with a reduction of 30-80%, and annealing. Annealing is performed by heating between the Ac.sub.1 point and the Ac.sub.3 point and cooling such that the temperature is either kept for at least 30 seconds in the range of 550.degree. C. to 350.degree. C. or slowly decreased at a rate of 400.degree. C./min or less in that temperature range.

High tensile strength steel sheet having improved formability

Growing community of inventors

Amagasaki, Japan

Tomoki Fukagawa