Treatment In A Magnetic Field Patents (Class 148/108)
  • Patent number: 10312755
    Abstract: A motor may include a rotor comprising a shaft; a stator; and a bearing supporting the shaft. The rotor may include a plurality of core piece parts arranged along a circumferential direction; and a plurality of permanent magnets arranged between neighboring core piece parts. The permanent magnets may include two magnetic poles, and the magnetic poles of neighboring permanent magnets being arranged such that magnetic poles with identical polarity face each other in the circumferential direction. The core piece parts may include a concave portion, and two protrusions which are disposed on both sides of the concave portion and protrude radially inward. The protrusions may a portion located on a radially inner side from the first segment when viewed in an axial direction.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: June 4, 2019
    Assignee: NIDEC CORPORATION
    Inventor: Naohiro Hashizume
  • Patent number: 10269488
    Abstract: The present invention provides a method for preparing a permanent magnet material, the method comprising coating step and infiltrating step, wherein, coating a rare earth element-containing substance on the surface of a permanent magnet, the magnet having a thickness of 10 mm or less at least in one direction, then placing the magnet into a container, vacuuming to an atmospheric pressure of below 10 Pa, closing the passageway, and then heat treating the closed container. Using the method of the present invention enables the rare earth element to infiltrate homogeneously with a high permeability. In addition, the present invention may have a lower production cost, significantly increase coercive force of the permanent magnet material, but decrease the remanence very little.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: April 23, 2019
    Assignee: Tianhe (Baotou) Advanced Tech Magnet Co., Ltd.
    Inventors: Haibo Yi, Yi Dong, Shulin Diao, Yi Yuan, Shujie Wu, Cailing Sun, Juchang Miao, Ya Chen, Wenjie Yuan
  • Patent number: 10020097
    Abstract: A method of manufacturing an R-T-B rare earth sintered magnet includes a process of disposing and sintering a compact of a first alloy powder and an alloy material of a second alloy in a chamber of a sintering furnace. The first alloy consists of R which represents a rare earth element, T which represents a transition metal essentially containing Fe, a metal element M which represents Al and/or Ga, B, Cu, and inevitable impurities. The first alloy contains 11 at % to 17 at % of R, 4.5 at % to 6 at % of B, 0 at % to 1.6 at % of M, and T as the balance, and Dy content in all of the rare earth elements is 0 at % to 29 at %. The second alloy consists of R which represents a rare earth element, T which represents a transition metal essentially containing Fe, a metal element M which represents Al and/or Ga, B, Cu, and inevitable impurities. The second alloy contains 11 at % to 20 at % of R, 4.5 at % to 6 at % of B, and 0 at % to 1.
    Type: Grant
    Filed: April 21, 2014
    Date of Patent: July 10, 2018
    Assignee: SHOWA DENKO K.K.
    Inventors: Kenichiro Nakajima, Akifumi Muraoka, Takashi Yamazaki
  • Patent number: 9994949
    Abstract: A method may include annealing a material including iron and nitrogen in the presence of an applied magnetic field to form at least one Fe16N2 phase domain. The applied magnetic field may have a strength of at least about 0.2 Tesla (T).
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: June 12, 2018
    Assignees: Regents of the University of Minnesota, UT-Battelle, LLC
    Inventors: Michael P. Brady, Orlando Rios, Yanfeng Jiang, Gerard M. Ludtka, Craig A. Bridges, Jian-Ping Wang, Xiaowei Zhang, Lawrence F. Allard, Edgar Lara-Curzio
  • Patent number: 9991438
    Abstract: The present invention provides a magnetostrictive member with high performance, high reliability and high versatility. The magnetostrictive member is used in the vibration power generation as a power source for extracting electric energy from various vibrations. The member made of the single crystal is manufactured cheaper than the conventional manufacturing method. The magnetostrictive member is formed by cutting a single crystal of Fe—Ga alloy by using electric discharge machining in a state that <100> orientation of the crystal of the Fe—Ga alloy is aligned in a direction in which magnetostriction of the magnetostrictive member is required.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: June 5, 2018
    Assignee: NIPPON KOSHUHA STEEL Co., Ltd
    Inventor: Katsuya Imai
  • Patent number: 9930729
    Abstract: Described herein is a method of forming a heat-treated material includes positioning the heat-treated material between first and second susceptors. Each of the first and second susceptors includes a tool face shaped according to a desired shape of the heat-treated material. The method also includes applying a low-strength magnetic field to the first and second susceptors to heat the first and second susceptors. Further, the method includes compressing the heat-treated material between the first and second susceptors to form the heat-treated material into the desired shape. The method additionally includes applying a high-strength magnetic field to the heat-treated material before compressing the heat-treated material between the first and second susceptors.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: March 27, 2018
    Assignee: The Boeing Company
    Inventors: Marc R. Matsen, Mark A. Negley
  • Patent number: 9923423
    Abstract: In one embodiment, a permanent magnet rotor is provided. The permanent magnet rotor includes at least one permanent magnet and a substantially cylindrical rotor core including an outer edge and an inner edge defining a central opening. The rotor core includes a radius R, at least one pole, and at least one radial aperture extending radially though the rotor core from the outer edge to a predetermined depth less than the radius. The at least one radial aperture is configured to receive the at least one permanent magnet. The rotor further includes at least one protrusion extending into the at least one radial aperture, the at least one protrusion positioned substantially along a bottom of the at least one radial aperture and configured to facilitate retention of the at least one permanent magnet within the at least one radial aperture.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: March 20, 2018
    Assignee: Regal Beloit America, Inc.
    Inventors: Subhash Marutirao Brahmavar, Lester Benjamin Manz, Ludovic Andre Chretien, Changiz Rashidzadeh, Dan Mircea Ionel
  • Patent number: 9822424
    Abstract: An annealing system and method of operating is described. The annealing system includes a furnace having a vacuum chamber wall that defines a processing space into which a plurality of workpieces may be translated and subjected to thermal and magnetic processing, wherein the furnace further includes a heating element assembly having at least one heating element located radially inward from the vacuum chamber wall and immersed within an outer region of the processing space, and wherein the heating element is composed of a non-metallic, anti-magnetic material. The annealing system further includes a magnet system arranged outside the vacuum chamber wall of the furnace, and configured to generate a magnetic field within the processing space.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: November 21, 2017
    Assignee: TOKYO ELECTRON LIMITED
    Inventors: Toru Ishii, Mitsuru Yamazaki
  • Patent number: 9548644
    Abstract: A method of resin sealing a permanent magnet in a magnet insertion portion of a laminated body, the body formed by laminating plural core sheets and including the plural portions formed around a shaft hole in a center of the plural portions, the portion connected to an internal space via an opening. The method includes a first process of positioning a blocking member blocking the opening from a side of the space in a way that the member is vertically-placed in a lower die or an upper die, while the both dies hold the body from both sides in an axial direction and close the portion; and a second process of filling a resin extruded from a resin reservoir portion provided in the die or the die into the portion having the magnet inserted and having the opening closed by the member.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: January 17, 2017
    Assignees: MITSUI HIGH-TEC, INC., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira Nagai, Go Kato, Yoshitada Yamagishi
  • Patent number: 9536804
    Abstract: Provided is a method of manufacturing a heat conductive sheet that itself is imparted with stickiness and has reduced heat resistance due to improved adhesion to a heat generator and a heat dissipater and that may be fixed provisionally without the need for using an adhesive agent or the like. The method includes the steps of molding a heat conductive resin composition, which includes heat conductive fillers and a binder resin, into a predetermined shape and curing the heat conductive resin composition to obtain a molded product of the heat conductive resin composition, cutting the molded product into sheets to obtain a molded product sheet, and coating an entire surface of a sheet main body (7) with an uncured component (8) of the binder resin oozing from the sheet main body (7).
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: January 3, 2017
    Assignee: Dexerials Corporation
    Inventors: Keisuke Aramaki, Atsuya Yoshinari, Takuhiro Ishii, Shinichi Uchida, Masahiko Ito
  • Patent number: 9531220
    Abstract: A motor having a structure capable of achieving an enhancement in durability and a washing machine, to which the motor is applied. The motor includes a stator including a plurality of stator cores arranged in a circumferential direction, and coils respectively wound around the stator cores, and a rotor rotatably arranged inside or outside the stator. The rotor includes a plurality of rotor cores arranged in a circumferential direction of the rotor, a plurality of magnets each disposed between neighboring ones of the rotor cores, a molded body having a bridge to support the plurality of rotor cores and the plurality of magnets, and a coupler including coupling ribs outwardly extending from an outer circumferential surface of the bridge in a radial direction of the rotor, and coupling grooves formed at inner ends of the rotor cores supported by the bridge, to receive the coupling ribs, respectively.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: December 27, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Young Kwan Kim, Keun Young Yoon, Woong Hwang, Byung Ryel In, Sung Gu Lee, Su Kwon Jeong, Myung Bae Bang
  • Patent number: 9479016
    Abstract: An electric machine includes a primary section, a secondary section interacting with the primary section via an air gap during operation of the electric machine, and a first base element fastened to the secondary section. The base element includes a first pole shoe having a first end and a second end, with the second end of the first pole shoe facing the air gap, a second pole shoe having a first end and a second end, with the second end of the second pole shoe facing the air gap, and a permanent magnet disposed between the first pole shoe and the second pole shoe. The permanent magnet has a magnetization from the first pole shoe to the second pole shoe, and is formed by a matrix with a magnetically active material embedded therein.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: October 25, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Matthias Dorfner, Zeljko Jajtic, Gerhard Matscheko
  • Patent number: 9451900
    Abstract: The present invention relates to an arrangement (10) for heating of a magnetic material (100) located in the center region of an inscribed sphere within a region of action, which arrangement comprises: —selection means (210) for generating a magnetic selection field (211) having a pattern in space of its magnetic field strength such that a first sub-zone (301) having a low magnetic field strength and a second sub-zone (302) having a higher magnetic field strength are formed in the region of action (300), —drive means (220) for changing the position in space of the two sub-zones (301, 302) in the region of action (300) by means of a magnetic drive field (221) so that the magnetization of the magnetic material (100) changes locally, and —control means (76) for controlling the drive means (220) to change the position in space of the first sub-zone (301) along a sequence of locations around said inscribed sphere for so long and with such a frequency that the center region of said inscribed sphere is heated.
    Type: Grant
    Filed: April 19, 2010
    Date of Patent: September 27, 2016
    Assignee: Koninklijke Philips N.V.
    Inventor: Hans Marc Bert Boeve
  • Patent number: 9411183
    Abstract: Embodiments of the invention disclose a liquid crystal display device and a method for manufacturing the same. The liquid crystal display device comprises: a color filter substrate including a first transparent substrate; and an array substrate including a second transparent substrate, wherein the first transparent substrate has a first transparent magnetic film layer formed thereon, the second transparent substrate has a second transparent magnetic film layer formed thereon, and the first transparent magnetic film layer and the second transparent magnetic film layer have the same magnetism.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: August 9, 2016
    Assignees: BOE TECHNOLOGY GROUP CO., LTD., CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Xiongcan Zuo, Junhwan Lim
  • Patent number: 9287742
    Abstract: An internal permanent magnet machine includes a rotor assembly having a shaft comprising a plurality of protrusions extending radially outward from a main shaft body and being formed circumferentially about the main shaft body and along an axial length of the main shaft body. A plurality of stacks of laminations are arranged circumferentially about the shaft to receive the plurality of protrusions therein, with each stack of laminations including a plurality of lamination groups arranged axially along a length of the shaft and with permanent magnets being disposed between the stacks of laminations. Each of the laminations includes a shaft protrusion cut formed therein to receive a respective shaft protrusion and, for each of the stacks of laminations, the shaft protrusion cuts formed in the laminations of a respective lamination group are angularly offset from the shaft protrusion cuts formed in the laminations in an adjacent lamination group.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: March 15, 2016
    Inventors: Patel Bhageerath Reddy, Ayman Mohamed Fawzi EL-Refaie, Kum-Kang Huh, James Pellegrino Alexander
  • Patent number: 9230565
    Abstract: A magnetic shield for a magnetic recording head includes a plurality of ferromagnetic layers, a spacer layer, and a buffer layer, wherein the buffer layer includes Co, Fe, B, or a combination thereof and effectively reduces irregular grain growth within the ferromagnetic layers, the spacer layer includes Ru, and the ferromagnetic layers magnetically couple through each of the buffer layer and the spacer layer.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: January 5, 2016
    Assignee: Western Digital (Fremont), LLC
    Inventors: Rongfu Xiao, Daniele Mauri, Ming Mao, Haiwen Xi
  • Patent number: 9217187
    Abstract: The method provides heat-resistant chromia- or alumina-forming Fe-, Fe(Ni), Ni(Fe), or Ni-based alloys having improved creep resistance. A precursor is provided containing preselected constituents of a chromia- or alumina-forming Fe-, Fe(Ni), Ni(Fe), or Ni-based alloy, at least one of the constituents for forming a nanoscale precipitate MaXb where M is Cr, Nb, Ti, V, Zr, or Hf, individually and in combination, and X is C, N, O, B, individually and in combination, a=1 to 23 and b=1 to 6. The precursor is annealed at a temperature of 1000-1500° C. for 1-48 h in the presence of a magnetic field of at least 5 Tesla to enhance supersaturation of the MaXb constituents in the annealed precursor. This forms nanoscale MaXb precipitates for improved creep resistance when the alloy is used at service temperatures of 500-1000° C. Alloys having improved creep resistance are also disclosed.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: December 22, 2015
    Assignee: UT-BATTELLE, LLC
    Inventors: Michael P. Brady, Gail M. Ludtka, Gerard M. Ludtka, Govindarajan Muralidharan, Don M. Nicholson, Orlando Rios, Yukinori Yamamoto
  • Patent number: 9147409
    Abstract: Implementations disclosed herein provide a method comprising rocking an effective annealing magnetic field between a first positive angle and a second negative angle compared to a desired pinning field orientation in an AFM/PL structure, wherein an angular amplitude of rocking the effective annealing magnetic field between a first positive angle and a second negative angle gradually decreases towards the desired orientation of pinning in the AFM/PL structure.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: September 29, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Konstantin Nikolaev, Victor Sapozhnikov, Taras Pokhil, Jae-Young Yi, Mohammed Patwari, Eric W. Singleton
  • Patent number: 9013274
    Abstract: An article, system and method related to a magnetomechanical marker used to mark stationary assets. Magnetomechanical markers can be arranged in clusters and associated with stationary assets, including assets buried underground. Markers can be associated with an asset by being attached to the asset, arranged in a particular spatial relationship with the asset, or in any other appropriate way. A portable locating device can be used to generate an alternating magnetic field to activate the magnetomechanical marker and thus locate the asset.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: April 21, 2015
    Assignee: 3M Innovative Properties Company
    Inventors: Ziyad H. Doany, Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce, Jr.
  • Publication number: 20150079305
    Abstract: A manufacturing method and a manufacturing apparatus for a printing magnetic orientation master and a magnetic pigment presswork are provided. The manufacturing method for a printing magnetic orientation master comprises: providing a magnet; using a heat radiation beam to heat a partial area of the magnet so that a new magnetic domain structure is formed in the partial area through self-magnetization of the magnet to change a magnetic-field distribution in the partial area; and removing the heat radiation beam to keep the new magnetic domain structure after it is decreased to a normal temperature so that the changed magnetic-field distribution is kept in the partial area, thus forming the printing magnetic orientation master having a predetermined magnetic orientation pattern. This can simplify the manufacturing process of the printing magnetic orientation master and allow the printing magnetic orientation master to carry abundant pattern information.
    Type: Application
    Filed: April 8, 2013
    Publication date: March 19, 2015
    Inventors: Xing Wang, Yumin Liao, Qian Huang, Yifeng Yang, Pu Wang
  • Publication number: 20150071702
    Abstract: The present invention provides a structural body comprising a welded portion of a duplex stainless steel inclusive of an ? phase and a ? phase and an unwelded portion of the duplex stainless steel, wherein an X-ray diffraction intensity for the ? phase is higher in a heat affected zone including the welded portion than in the unwelded portion and becomes a local maximum within the heat affected zone. The present invention provides aA production method for a structural body of a duplex stainless steel, wherein a heat affected zone including a welded portion of the structural body is heat-treated between 600° C. and 800° C. while a magnetic field of 1˜10 T is applied to the heat affected zone.
    Type: Application
    Filed: August 19, 2014
    Publication date: March 12, 2015
    Applicant: HITACHI, LTD.
    Inventors: Matahiro KOMURO, Naoya OKIZAKI, Masafumi NOJIMA
  • Publication number: 20140338793
    Abstract: A method includes producing an amorphous precursor to a nanocomposite, the amorphous precursor comprising a material that is substantially without crystals not exceeding 20% volume fraction; performing devitrification of the amorphous precursor, wherein the devitrification comprises a process of crystallization; forming, based on the devitrification, the nanocomposite with nano-crystals that contains an induced magnetic anisotropy; tuning, based on one or more of composition, temperature, configuration, and magnitude of stress applied during annealing and modification, the magnetic anisotropy of the nanocomposite; and adjusting, based on the tuned magnetic anisotropy, a magnetic permeability of the nanocomposite.
    Type: Application
    Filed: May 15, 2014
    Publication date: November 20, 2014
    Inventors: Alex M. Leary, Paul R. Ohodnicki, Michael E. McHenry, Vladimir Keylin, Joseph Huth, Samuel J. Kernion
  • Publication number: 20140299232
    Abstract: The present technology relates to a Ni—Mn—Ga magnetic shape memory (MSM) alloy including twin boundaries type 2, which are deviated approximately +/?2-4 degrees from (101) or equivalent crystallographic plane by rotation about [?101] or equivalent crystallographic direction. This technology relates also to an actuator, sensor and harvester including MSM element of this technology.
    Type: Application
    Filed: May 21, 2012
    Publication date: October 9, 2014
    Applicant: ADAPTIVE MATERIALS TECHNOLOGY - ADAPTAMAT OY
    Inventors: Yossef Ezer, Oleksii Sozinov, Ladislav Straka, Aleksandr Soroka, Nataliya Lanska
  • Publication number: 20140251506
    Abstract: A method of making a single crystal comprises heating a material comprising magnetic anisotropy to a temperature T sufficient to form a melt of the material. A magnetic field of at least about 1 Tesla is applied to the melt at the temperature T, where a magnetic free energy difference ?Gm between different crystallographic axes is greater than a thermal energy kT. While applying the magnetic field, the melt is cooled at a rate of about 30° C./min or higher, and the melt solidifies to form a single crystal of the material.
    Type: Application
    Filed: March 8, 2013
    Publication date: September 11, 2014
    Inventor: UT-Battelle, LLC
  • Patent number: 8695210
    Abstract: A method for preparing the magnet includes the steps of: (a) providing a sintered Nd base magnet block having surfaces and a magnetization direction, (b) coating the surfaces of the magnet block excluding the surface perpendicular to the magnetization direction with a Dy or Tb oxide powder, a Dy or Tb fluoride powder, or a Dy or Tb-containing alloy powder, (c) treating the coated block at a high temperature for causing Dy or Tb to diffuse into the block, and (d) cutting the block in a plane perpendicular to the magnetization direction into a magnet segment having a coercive force distribution on the cut section that the coercive force is high at the periphery and lower toward the inside and a constant coercive force distribution in the magnetization direction.
    Type: Grant
    Filed: November 27, 2009
    Date of Patent: April 15, 2014
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Koji Miyata, Takehisa Minowa, Hajime Nakamura, Koichi Hirota, Masakatsu Honshima
  • Patent number: 8673048
    Abstract: Iron impurities may be removed from volumes of molten aluminum or magnesium metals or alloys by applying a static magnetic field gradient to each of the molten metal volumes, or melts. The magnetic field gradient is applied to each of the melts so that separate-phase iron impurities suspended therein will move in the direction of the applied magnetic field and become concentrated in a predetermined region of the of the melts, thereby forming an iron-rich region. The remaining iron-depleted region of each of the melts can be physically separated from the as-formed iron-rich region and cast into shaped articles of manufacture or into semi-finished articles for further processing. Such articles will have a lower iron-content than the original molten metal volumes.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: March 18, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Guangling Song, Jan F. Herbst, Anil K. Sachdev
  • Publication number: 20130256574
    Abstract: A material containing a soft magnetic substance is subjected to a plastic deformation such as a roll processing to obtain a rod-shaped body. Then, the rod-shaped body or a shaped body obtained by processing the rod-shaped body into a shape other than a flat plate shape is subjected to a heat treatment in the presence of a magnetic field. The rod-shaped body or the shaped body is made magnetic-anisotropic by the heat treatment thereby to obtain a magnetic-anisotropic plastically deformed body.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Applicant: KEIHIN CORPORATION
    Inventors: Hidehiro Hoshina, Toshiro Harakawa, Keiichi Koyama, Kohki Takahashi
  • Publication number: 20130213525
    Abstract: A grain oriented electrical steel sheet has a total length of cracks in a film on a steel sheet surface, of 20 ?m or less per 10000 ?m2 of the film, wherein magnetic domain refinement interval in a rolling direction of the steel sheet, provided in magnetic domain refinement through substantially linear introduction of thermal strain from one side of the steel sheet corresponding to a winding outer peripheral side of a coiled steel sheet at a stage of final annealing in a direction intersecting the rolling direction; and deflection of 3 mm or less per unit length: 500 mm in the rolling direction of the steel sheet.
    Type: Application
    Filed: August 4, 2011
    Publication date: August 22, 2013
    Applicant: JFE Steel Corporation
    Inventors: Yukihiro Shingaki, Noriko Makiishi, Takeshi Imamura
  • Publication number: 20130206283
    Abstract: A grain oriented electrical steel sheet has thermal strain introduced thereinto in a dotted-line arrangement in which strain-imparted areas are lined in a direction that crosses a rolling direction of the steel sheet, wherein the strain-imparted areas introduced in the dotted-line arrangement have a size from 0.10 mm or more to 0.50 mm or less and an interval between the adjacent strain-imparted areas is from 0.10 mm or more to 0.60 mm or less.
    Type: Application
    Filed: August 5, 2011
    Publication date: August 15, 2013
    Applicant: JFE STEEL CORPORATION
    Inventors: Hirotaka Inoue, Hiroi Yamaguchi, Seiji Okabe, Takeshi Omura
  • Patent number: 8470092
    Abstract: A method (and structure) of thermally treating a magnetic layer of a wafer, includes annealing, for a predetermined short duration, a magnetic layer of a single wafer.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: June 25, 2013
    Assignee: International Business Machines Corporation
    Inventors: Ulrich Karl Klostermann, Wolfgang Raberg, Philip Trouilloud
  • Publication number: 20130143050
    Abstract: A grain oriented electrical steel sheet that is subjected to magnetic domain refining treatment by electron beam irradiation and exhibits excellent low-noise properties when assembled as an actual transformer in which tension exerted on the steel sheet by the forsterite film is 2.0 MPa or higher both in a rolling direction and a direction transverse (perpendicular) to the rolling direction, and a ratio of an irradiation pitch in a thermal strain introduced region (B) to a spot diameter (A) on an electron beam irradiation surface satisfies 0.5?B/A?5.0.
    Type: Application
    Filed: August 3, 2011
    Publication date: June 6, 2013
    Applicant: JFE STEEL CORPORATION
    Inventors: Takeshi Omura, Hiroi Yamaguchi, Seiji Okabe
  • Patent number: 8456781
    Abstract: A composite free layer having a FL1/insertion/FL2 configuration where a top surface of FL1 is treated with a weak plasma etch is disclosed for achieving enhanced dR/R while maintaining low RA, and low ? in TMR or GMR sensors. The weak plasma etch removes less than about 0.2 Angstroms of FL1 and is believed to modify surface structure and possibly increase surface energy. FL1 may be CoFe, CoFe/CoFeB, or alloys thereof having a (+) ? value. FL2 may be CoFe, NiFe, or alloys thereof having a (?) ? value. The thin insertion layer includes at least one magnetic element such as Co, Fe, and Ni, and at least one non-magnetic element. When CoFeBTa is selected as insertion layer, the CoFeB:Ta ratio is from 1:1 to 4:1.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: June 4, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Tong Zhao, Hui-Chuan Wang, Min Li, Kunliang Zhang
  • Patent number: 8371021
    Abstract: A process of manufacturing segments, an anisotropic direction of which is continuously changed in a plane vertically by a uniform magnetic field maintained in a constant direction and a process of arranging a plurality of segments on a circumference, extruding the segments in a ring shape by rheology based on the viscous deformation of the segments, from one thrust-direction end surface of the segments, and subsequently compressing the segments from both thrust-direction end surfaces of the segments are necessarily included. A ring magnet, anisotropy of which is controlled in a continuous direction, is provided, and a source for generating a static magnetic field has energy density (BH) max?160 to 180 kJ/m3.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: February 12, 2013
    Assignee: Panasonic Corporation
    Inventors: Fumitoshi Yamashita, Kiyomi Kawamura, Yukihiro Okada, Hiroshi Murakami
  • Patent number: 8259420
    Abstract: A composite free layer having a FL1/insertion/FL2 configuration where a top surface of FL1 is treated with a weak plasma etch is disclosed for achieving enhanced dR/R while maintaining low RA, and low ? in TMR or GMR sensors. The weak plasma etch removes less than about 0.2 Angstroms of FL1 and is believed to modify surface structure and possibly increase surface energy. FL1 may be CoFe, CoFe/CoFeB, or alloys thereof with Ni, Ta, Mn, Ti, W, Zr, Hf, Tb, or Nb having a (+) ? value. FL2 may be CoFe, NiFe, or alloys thereof having a (?) ? value. The thin insertion layer includes at least one magnetic element such as Co, Fe, and Ni, and at least one non-magnetic element selected from Ta, Ti, W, Zr, Hf, Nb, Mo, V, Cr, or B. When CoFeBTa is selected as insertion layer, the CoFeB:Ta ratio is from 1:1 to 4:1.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: September 4, 2012
    Assignee: Headway Technologies, Inc.
    Inventors: Tong Zhao, Hui Chuan Wang, Min Li, Kunliang Zhang
  • Patent number: 8128757
    Abstract: There is provided a method of manufacturing a permanent magnet having extremely high orientation by arranging such that the crystal fractures of alloy raw meal powder having more equal crystal orientational relationship are combined in magnetic field. In this invention, alloy raw meal powder is filled into a cavity and, while agitating the alloy raw meal powder inside the cavity, is oriented in the magnetic field. This oriented body is then compression molded in the magnetic field into a predetermined shape.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: March 6, 2012
    Assignee: Ulvac, Inc.
    Inventors: Hiroshi Nagata, Yoshinori Shingaki
  • Patent number: 8130067
    Abstract: A semiconductor transformer provides high frequency operation by forming the primary windings of the transformer around a section of magnetic material that has a hard axis that lies substantially parallel to the direction of the magnetic field generated by the primary windings. The core can also be formed to have a number of sections where the magnetic flux follows the hard axis through each section of the core.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: March 6, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Dok Won Lee, Peter Smeys, Anuraag Mohan, Peter J. Hopper
  • Patent number: 8125338
    Abstract: An acousto-magnetic (AM) anti-theft alarming unit is designed for specific use in a hard tag anti-theft clamp which uses a magnetic detacher. The alarming unit includes a resonator housing defining a cavity in which is placed at least one resonator and a bias piece covered by a housing cover affixed to the resonator housing. The resonators are placed into the housing cavity in a vertically layered configuration. The bias piece is placed along the side of the resonators, as opposed to being beneath the resonators, as is conventional in the art. The bias piece is preferably made of a sintered rare-earth permanent magnet and has a high coercivity. Accordingly, this alarming unit has a strong resistance to demagnetization and a resistance to being shielded by metal. The bias piece has a strong anti-destruction ability, a simple structure and is easy to manufacture.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: February 28, 2012
    Assignee: Ningbo Signatronic Technologies, Ltd.
    Inventor: Lin Li
  • Patent number: 8108987
    Abstract: A method of manufacturing a magnetic resonance imaging (MRI) device is provided including providing at least one magnet positioned between a keeper device and a yoke, the keeper device being positioned at a pole region of the at least one magnet, positioning at least one pole device at the pole region of the at least one magnet, and removing the keeper device from the pole region to allow the at least one pole device to be positioned at the pole region of the at least one magnet.
    Type: Grant
    Filed: November 3, 2004
    Date of Patent: February 7, 2012
    Assignee: General Electric Company
    Inventors: Bulent Aksel, Judson Sloan Marte, Juliana Chiang Shei, Mark Gilbert Benz, Yuji Inoue
  • Patent number: 8105445
    Abstract: A method (and structure) of thermally treating a magnetic layer of a wafer, includes annealing, for a predetermined short duration, a magnetic layer of a single wafer.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: January 31, 2012
    Assignees: International Business Machines Corporation, Qimonda AG
    Inventors: Ulrich Karl Klostermann, Wolfgang Raberg, Philip Trouilloud
  • Publication number: 20110220249
    Abstract: A system and method for producing material characteristics are described. A magnetic treatment chamber (14) with a high magnetic field treats workpieces; and a conveyor or transporter (26) continuously moves the workpieces (22) through the high magnetic field in the magnetic chamber. A frictional or mechanical engagement system (40a, 40b) extracts the workpieces through and out of the high magnetic field.
    Type: Application
    Filed: June 30, 2009
    Publication date: September 15, 2011
    Applicant: EATON CORPORATION
    Inventors: Alexander Bogicevic, Aquil Ahmad, John Albert Kovacich, Bohdan Lisowsky, Michael Lee Killian, Alaa Abdel-Azim Elmoursi
  • Publication number: 20110079325
    Abstract: An interior permanent magnet (IPM) rotary machine comprises a rotor comprising a rotor yoke having bores and a plurality of permanent magnet segments disposed in the bores of the rotor yoke, each permanent magnet segment consisting of a plurality of magnet pieces. The rotor is assembled by inserting the plurality of unbound magnet pieces in each bore for stacking the magnet pieces, and fixedly securing the stacked magnet pieces in the bore.
    Type: Application
    Filed: September 24, 2010
    Publication date: April 7, 2011
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Yuhito Doi, Takehisa Minowa, Hajime Nakamura, Koichi Hirota
  • Patent number: 7880573
    Abstract: A method for reducing a temperature rise of a magnetic material is provided. The method includes applying force to the magnetic material to reduce a dimensional change of the magnetic material during a first part of an operation cycle, such as due to magnetostriction. The force is removed from the magnetic material during a second part of an operation cycle, allowing magnetostrictive dimensional changes to occur.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: February 1, 2011
    Assignee: iGo, Inc.
    Inventors: Bryan Wayne McCoy, Jason Walter Swanson
  • Patent number: 7861403
    Abstract: A current transformer core has a ratio of the core outside diameter Da to the core inside diameter Di of <1.5, a saturation magnetostriction ?s of =|4| ppm, a circular hysteresis loop with 0.50=Br/Bs=0.85 and an Hcmax=20 mA/cm. The current transformer core is made of a soft magnetic iron alloy in which at least 50% of the alloy structure is occupied by fine-crystalline particles with an average particle size of 100 nm or less, and the iron-based alloy comprises, in essence, one combination.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: January 4, 2011
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Wulf Guenther, Detlef Otte, Joerg Petzold
  • Patent number: 7805828
    Abstract: A method of manufacturing a thin-film magnetic head including forming the first shield layer; forming the magnetoresistive device, carried out after forming the first shield layer, a heat treatment providing exchange coupling between the ferromagnetic layer and the antiferromagnetic layer so as to magnetize the ferromagnetic layer in a predetermined direction; forming the domain control layer so as to hold the magnetoresistive device in a track width direction; magnetizing the domain control layer in a direction yielding a magnetic field in the same direction as with a magnetic field received by the ferromagnetic layer upon exchange-coupling with the antiferromagnetic layer, forming the second shield layer, carried out after magnetizing the domain control layer, and remagnetizing the domain control layer in a direction yielding the longitudinal bias magnetic field, carried out after forming the second shield layer.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: October 5, 2010
    Assignee: TDK Corporation
    Inventors: Koji Shimazawa, Yoshihiro Tsuchiya
  • Patent number: 7772529
    Abstract: Methods and systems for improving permalloy sensitivity. One or more permalloy sensing components can be configured upon a substrate, and one or more conductors are located above a portion of the permalloy sensing component of interest. A current can then be initiated through the conductor. The substrate can then be heated such that the current creates a magnetic field that modifies the anisotropy of the portion of the permalloy sensing component of interest, thereby providing selective anisotropy and improving permalloy sensitivity thereof.
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: August 10, 2010
    Assignee: Honeywell International Inc.
    Inventor: Perry A. Holman
  • Patent number: 7763094
    Abstract: A precursor particle having a particle size of 10 nm or more and 1 ?m or less, and comprising a first compound selected from an alkoxide, a hydroxide, a sulfate, a nitrate, a carbonate, or a carboxylate of magnetic metal containing at least one metal of Fe and Co, and a second compound selected from an alkoxide or a hydroxide, a sulfate, a nitrate, a carbonate, or a carboxylate of a metal element for forming an oxide, is prepared. Then the precursor particle is heated in a reducing atmosphere to form an insulating particle made of an oxide of the metal element by decomposing the second compound, and to precipitate a particle of the magnetic metal in the insulating particle at a particle size of 1 nm or more and 100 nm or less, thereby manufacturing a high frequency magnetic material.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: July 27, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tomohiro Suetsuna, Seiichi Suenaga, Kouichi Harada, Maki Yonetsu
  • Patent number: 7740714
    Abstract: A radially anisotropic magnet is prepared by furnishing a cylindrical magnet-compacting mold comprising a die, a core, and top and bottom punches, packing a magnet powder in the mold cavity, applying a magnetic field across the magnet powder, and forcing the top and bottom punches to compress the magnet powder for compacting the magnet powder by a horizontal magnetic field vertical compacting process. The top punch is divided into segments so that the magnet powder may be partially compressed; in the step of compacting the magnet powder packed in the mold cavity by a horizontal magnetic field vertical compacting process, the magnet powder is partially compressed by the segments of the top punch cooperating with the bottom punch for thereby consolidating the partially compressed zones of magnet powder to a density from 1.
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: June 22, 2010
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Koji Sati, Mitsuo Kitagawa, Takehisa Minowa
  • Patent number: 7686895
    Abstract: A method of forming gray iron components includes applying a substantially uniform magnetic field to gray iron. The method also includes heat-treating the gray iron while the gray iron is within the magnetic field.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: March 30, 2010
    Assignee: Caterpillar Inc.
    Inventors: Ashwin A. Hattiangadi, Adrian Vasile Catalina, Leo Chuzhoy, Jun Cai
  • Patent number: 7651573
    Abstract: A ferromagnetic resonator for use in a marker in a magnetomechanical electronic article surveillance system has improved magnetoresonant properties and/or reduced eddy current losses by virtue of being annealed so that the resonator has a fine domain structure with a domain width less than about 40 ÿm, or less than about 1.5 times the thickness of the resonator. This produces in the resonator an induced magnetic easy axis which is substantially perpendicular to the axis along which the resonator is operated magnetically by a magnetic bias element also contained in the marker. The annealing which produces these characteristics can take place in a magnetic field of at least 1000 Oe, oriented at an angle with respect to the plane of the material being annealed so that the magnetic field has a significant component perpendicular to this plane, a component of at least about 20 Oe across the width of the material, and a smallest component along the direction of transport of the material through the annealing oven.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: January 26, 2010
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventor: Giselher Herzer
  • Publication number: 20090223602
    Abstract: A method of magnetizing a filter is disclosed. Magnetizing a filter improves the ability of the filter to remove ferromagnetic contaminants from a fluid by allowing the filter to attract and catch contaminants that have metallic properties. The method involves magnetizing the metal components of the filter, which include the filter canister, the filter end cap, the filter element frame, and any other components made from ferromagnetic materials.
    Type: Application
    Filed: March 4, 2009
    Publication date: September 10, 2009
    Inventor: Clarence Edward Adkins