Patents by Inventor Tomoki Fukagawa
Tomoki Fukagawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20170018342Abstract: An R-T-B based sintered magnet has a composition represented by the following formula (1) which satisfies the following inequality expressions (2) to (9): uRwBxGazAlvCoqTigFejM??(1) (R is at least one of rare-earth elements and indispensably includes Nd, M is an element except for R, B, Ga, Al, Co, Ti, and Fe, and u, w, x, z, v, q, g, and j are expressed in terms of % by mass). 29.0?u?32.0??(2) (heavy rare-earth elements RH account for 10% by mass or less of the R-T-B based sintered magnet) 0.93?w?1.00??(3) 0.3?x?0.8??(4) 0.05?z?0.5??(5) 0?v?3.0??(6) 0.15?q?0.28??(7) 60.42?g?69.57??(8) 0?j?2.0??(9) and satisfies other requirements.Type: ApplicationFiled: February 27, 2015Publication date: January 19, 2017Applicant: HITACHI METALS, LTD.Inventors: Tomoki FUKAGAWA, Noriyuki NOZAWA, Takeshi NISHIUCHI, Daisuke FURUSAWA, Shinichiroh SAKASHITA
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Patent number: 8323806Abstract: A rare-earth magnet includes a magnet body made of an R—Fe—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 R2Fe14B type crystals, included in the magnet body, to have received the rare-earth element that has been included in the R2Fe14B 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.Type: GrantFiled: December 11, 2009Date of Patent: December 4, 2012Assignee: Hitachi Metals, Ltd.Inventor: Tomoki Fukagawa
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Publication number: 20100092660Abstract: A rare-earth magnet includes a magnet body made of an R—Fe—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 R2Fe14B type crystals, included in the magnet body, to have received the rare-earth element that has been included in the R2Fe14B 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.Type: ApplicationFiled: December 11, 2009Publication date: April 15, 2010Applicant: HITACHI METALS, LTD.Inventor: Tomoki FUKAGAWA
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Patent number: 7655325Abstract: A rare-earth magnet includes a magnet body made of an R—Fe—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 R2Fe14B type crystals, included in the magnet body, to have received the rare-earth element that has been included in the R2Fe14B 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.Type: GrantFiled: June 25, 2008Date of Patent: February 2, 2010Assignee: Hitachi Metals, Ltd.Inventor: Tomoki Fukagawa
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Publication number: 20080254285Abstract: A rare-earth magnet includes a magnet body made of an R—Fe—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 R2Fe14B type crystals, included in the magnet body, to have received the rare-earth element that has been included in the R2Fe14B 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.Type: ApplicationFiled: June 25, 2008Publication date: October 16, 2008Applicant: HITACHI METALS, LTD.Inventor: Tomoki FUKAGAWA
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Patent number: 7046490Abstract: 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.Type: GrantFiled: January 6, 2000Date of Patent: May 16, 2006Assignee: Western Digital (Fremont), Inc.Inventors: Masaki Ueno, Hideyasu Nagai, Koichi Suzuki, Tomoki Fukagawa, Fuminori Hikami
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Patent number: 6777362Abstract: A dielectric ceramic composition wherein the dielectric constant ∈ 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 Li2O—R2O3—TiO2-based composition, an improved dielectric constant ∈ can be achieved by introducing a specific quantity of Bi2O3, 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 Na2O together with the MO (where M is one or two of CA and Sr), in particular in the case of material of ∈r>150, it is possible to control &tgr;f to the vicinity of 0 while maintaining Qf at an high value.Type: GrantFiled: October 21, 2002Date of Patent: August 17, 2004Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Tomoki Fukagawa, Kazuhiro Nishikawa
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Patent number: 6636394Abstract: 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—Mn—X alloy, Ir—Mn—X alloy, Rh—Mn—X alloy, Ru—Mn—X alloy or Pd—Mn—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 %.Type: GrantFiled: February 23, 2000Date of Patent: October 21, 2003Assignee: Read-Rite SMI Corp.Inventors: Tomoki Fukagawa, Hiroshi Nishida, Masateru Nose, Fuminori Hikami
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Publication number: 20030100437Abstract: An object of the present invention is to obtain a dielectric ceramic composition wherein the dielectric constant ∈ is large, the temperature coefficient &tgr;f of the resonance frequency is close to 0, and which has a large Q value, 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 Li2O—R2O3—TiO2-based composition, an improved dielectric constant ∈ can be achieved by introducing a specific quantity of Bi2O3, 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).Type: ApplicationFiled: October 21, 2002Publication date: May 29, 2003Inventors: Tomoki Fukagawa, Kazuhiro Nishikawa
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Patent number: 6322911Abstract: 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 Pt1−xMnx alloy or an Ir1−xMnx 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 %.Type: GrantFiled: February 1, 2000Date of Patent: November 27, 2001Assignee: Read-Rite CorporationInventors: Tomoki Fukagawa, Hiroshi Nishida, Masanori Ueno, Masateru Nose, Hideyasu Nagai, Fuminori Higami
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Patent number: 5470529Abstract: 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.Type: GrantFiled: March 8, 1994Date of Patent: November 28, 1995Assignee: Sumitomo Metal Industries, Ltd.Inventors: Shigeki Nomura, Nozomi Komatsubara, Naomitsu Mizui, Kazutoshi Kunishige, Tomoki Fukagawa