No Single Metal Over 50 Percent Patents (Class 148/315)
  • Publication number: 20140283953
    Abstract: Method for producing a soft magnetic alloy strip suited to be mechanically cut, having a chemical composition comprising, by weight: 18% ?? Co ? 55%? 0% ? V + W ? 3% 0% ? Cr ? 3% 0% ? Si ? 3% 0% ? Nb ? 0.5%? 0% ? B ? 0.05%?? 0% ? C ? 0.1%? 0% ? Zr + Ta ? 0.5%? 0% ? Ni ? 5% 0% ? Mn ? 2% the rest being iron and impurities from production, according to which a strip obtained by hot rolling a semi-finished product consisting of the alloy is cold-rolled to obtain a cold-rolled strip with a thickness less than 0.6 mm, After the cold rolling, the strip is running annealed by passing it through a continuous furnace at a temperature between the order/disorder transition temperature of the alloy and the ferritic/austenitic transformation point of the alloy, followed by rapid cooling to a temperature below 200° C.
    Type: Application
    Filed: December 16, 2011
    Publication date: September 25, 2014
    Applicant: APERAM
    Inventors: Thierry Waeckerle, Remy Batonnet
  • Publication number: 20140251500
    Abstract: New magnetic materials containing cerium, iron, and small additions of a third element are disclosed. These materials comprise compounds Ce(Fe12?xMx) where x=1-4, having the ThMn12 tetragonal crystal structure (space group I4/mmm, #139). Compounds with M=B, Al, Si, P, S, Sc, Co, Ni, Zn, Ga, Ge, Zr, Nb, Hf, Ta, and W are identified theoretically, and one class of compounds based on M=Si has been synthesized. The Si cognates are characterized by large magnetic moments (4?Ms greater than 1.27 Tesla) and high Curie temperatures (264?Tc?305° C.). The Ce(Fe12?xMx) compound may contain one or more of Ti, V, Cr, and Mo in combination with an M element. Further enhancement in Tc is obtained by nitriding the Ce compounds through heat treatment in N2 gas while retaining the ThMn12 tetragonal crystal structure; for example CeFe10Si2N1.29 has Tc=426° C.
    Type: Application
    Filed: March 6, 2013
    Publication date: September 11, 2014
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: CHEN ZHOU, FREDERICK E. PINKERTON, JAN F. HERBST
  • 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: 8684594
    Abstract: A constant-modulus alloy, which has a low saturation magnetic flux density to provide weakly magnetic properties, a high Young's modulus, a low temperature coefficient of Young's modulus, and high hardness, is provided. A hairspring, a mechanical driving apparatus and a watch and clock, in which the alloy is used, are provided. The alloy consists of Co, Ni, Cr, Mo. and Fe. The alloy is healed and cooled before being subjected to repeated wiredrawing and intermediate annealing, forming a wire with a fiber structure having a <111> fiber axis. The wire is then cold rolled into a sheet and heated to obtain optimal magnetic insensitivity and hardness.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: April 1, 2014
    Assignees: The Foundation: The Research Institute for Electric and Magnetic Materials, Seiko Instruments Inc.
    Inventors: Yuetsu Murakami, Koichiro Jujo, Osamu Takahashi, Jun Tsuneyoshi, Ryo Sugawara, Takeshi Takano
  • Patent number: 8424314
    Abstract: The present invention relates to new intermetallic compounds having a crystalline structure of Ni3Sn2 type for the magnetic refrigeration, their use and a process for preparing the same. The present invention further relates to new magnetocaloric compositions for the magnetic refrigeration and their use.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: April 23, 2013
    Assignee: Universite Henri Poincare Nancy 1
    Inventor: Thomas Mazet
  • Patent number: 8372218
    Abstract: Magnet cores pressed using a powder of nanocrystalline or amorphous particles and a pressing additive should be characterized by minimal iron losses. These particles have first surfaces represented by the original strip surfaces and second surfaces represented by surfaces produced in a pulverization process, the overwhelming majority of these second particle surfaces being smooth cut or fracture surfaces without any plastic deformation, the proportion T of areas of plastic deformation of the second particle surfaces being 0?T?0.5.
    Type: Grant
    Filed: June 19, 2007
    Date of Patent: February 12, 2013
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Dieter Nuetzel, Markus Brunner
  • Publication number: 20130000794
    Abstract: A soft magnetic alloy is provided that consists essentially of 47 weight percent ?Co?50 weight percent, 1 weight percent V?3 weight percent, 0 weight percent ?Ni?0.2 weight percent, 0.08 weight percent ?Nb?0.12 weight percent, 0 weight percent ?C?0.005 weight percent, 0 weight percent ?Mn?0.1 weight percent, 0 weight percent ?Si?0.1 weight percent, remainder Fe.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 3, 2013
    Applicant: Vacuumschmelze GmbH & Co. KG
    Inventors: Witold PIEPER, Niklas VOLBERS, Joachim GERSTER
  • Publication number: 20130000797
    Abstract: A soft magnetic alloy is provided that consists essentially of 47 weight percent?Co?50 weight percent, 1 weight percent?V?3 weight percent, 0 weight percent?Ni?0.25 weight percent, 0 weight percent?C?0.007 weight percent, 0 weight percent?Mn?0.1 weight percent, 0 weight percent?Si?0.1 weight percent, at least one of niobium and tantalum in amounts of x weight percent of niobium, y weight percent of tantalum, remainder Fe. The alloy includes 0 weight percent?x<0.15 weight percent, 0 weight percent?y?0.3 weight percent and 0.14 weight percent?(y+2x)?0.3 weight percent. The soft magnetic alloy has been annealed at a temperature in the range of 730° C. to 880° C. for a time of 1 to 6 hours and comprises a yield strength in the range of 200 MPa to 450 MPa and a coercive field strength of 0.3 A/cm to 1.5 A/cm.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 3, 2013
    Applicant: Vacuumschmelze GmbH & Co. KG
    Inventors: Witold PIEPER, Niklas VOLBERS, Joachim GERSTER
  • Patent number: 8293030
    Abstract: The present invention relates to new intermetallic compounds having a crystalline structure of Ni3Sn2 type for the magnetic refrigeration, their use and a process for preparing the same. The present invention further relates to new magnetocaloric compositions for the magnetic refrigeration and their use.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: October 23, 2012
    Assignee: Universite de Lorraine
    Inventor: Thomas Mazet
  • Publication number: 20120234136
    Abstract: This invention relates to Mn—Al magnetic powders of a high coercive force which are obtained from Mn—Al alloy vaporized by plasma arc discharging, and a manufacturing method thereof. The Mn—Al magnetic powders are produced by discharging a plasma arc to a compact which is formed by compacting a blend containing 20-60% by weight of Mn powder and 40-80% by weight of Al powder, collecting nanoscale Mn—Al particles after cooling the vaporized blend, and heat-treating the particles. According to the present invention, the Mn—Al magnetic powders of light weight and enhanced corrosion resistance are produced at a low cost.
    Type: Application
    Filed: November 10, 2009
    Publication date: September 20, 2012
    Applicant: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Jung-Goo Lee, Chul-Jin Choi
  • Patent number: 8216393
    Abstract: A powder composite core is to be particularly dense and strong while being produced from soft magnetic alloys. In particular, the expansion of the heat-treated core is to be avoided. To produce this core, a strip of a soft magnetic alloy is first comminuted to form particles. The particles are mixed with a first binder having a curing temperature T1,cure and a decomposition temperature T1,decompose and a second binder having a curing temperature T2,cure and a decomposition temperature T2,decompose, wherein T1,cure<T2,cure?T1,decompose<T2,decompose. The mix is pressed to produce a magnet core while the first binder is cured. The magnet core is then subjected to a heat treatment accompanied by the curing of the second binder at a heat treatment temperature TAnneal>T2,cure.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: July 10, 2012
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Markus Brunner, Georg Werner Reppel
  • Patent number: 8114225
    Abstract: An article including a monolithic body including iron, cobalt, and nitrogen is provided. The monolithic body includes a matrix phase and a plurality of particles disposed within the matrix phase. The particles include a phase comprising nitrogen.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: February 14, 2012
    Assignee: General Electric Company
    Inventors: Luana Emiliana Iorio, Pazhayannur Ramanathan Subramanian, Michael Francis Xavier Gigliotti
  • Patent number: 8066825
    Abstract: A (CoFe)Zr/Nb/Ta/Hf based target material is provided which is capable of achieving a high sputtering efficiency and a high sputtering effect by increasing the leakage magnetic flux in the magnetron sputtering, and a method for producing the target material. This target material is made of an Fe—Co based alloy comprising not less than 80 atomic % in total of Fe and Co having an Fe:Co atomic ratio of 80:20 to 0:100, and less than 20 atomic % of one or more selected from the group consisting of Zr, Hf, Nb and Ta. The Fe—Co based alloy comprises a Co—Fe phase being a ferromagnetic phase, and the one or more selected from the group consisting of Zr, Hf, Nb and Ta are incorporated in solid solution form into the Co—Fe phase in a total amount of 0.5 to 2 atomic %.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: November 29, 2011
    Assignee: Sanyo Special Steel Co., Ltd.
    Inventors: Toshiyuki Sawada, Akihiko Yanagitani, Ryoji Hayashi, Yoshikazu Aikawa
  • Patent number: 8038808
    Abstract: A flat soft magnetic material to be used for a noise-suppressing magnetic sheet, wherein the 50% particle size D50 (?m), coercive force Hc (A/m) and bulk density BD (Mg/m3) of the flat soft magnetic material satisfy the following formula (1). D50/(HC×BD)?1.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: October 18, 2011
    Assignee: TDK Corporation
    Inventors: Atsuhito Matsukawa, Katsuhiko Wakayama, Hideharu Moru, Naoyoshi Sato, Yoshihito Hirai, Toshihisa Murayoshi
  • Patent number: 8012270
    Abstract: A soft magnetic alloy consists essentially of 5 percent by weight?Co?30 percent by weight, 1 percent by weight?Cr?20 percent by weight, 0.1 percent by weight?Al?2 percent by weight, 0 percent by weight?Si?1.5 percent by weight, 0.017 percent by weight?Mn?0.2 percent by weight, 0.01 percent by weight?S?0.05 percent by weight where Mn/S is >1.7, 0 percent by weight?O?0.0015 percent by weight, und 0.0003 percent by weight?Ce?0.05 percent by weight, 0 percent by weight?Ca?0.005 percent by weight and the remainder iron, where 0.117 percent by weight?(Al+Si+Mn+V+Mo+W+Nb+Ti+Ni)?5 percent by weight.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: September 6, 2011
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Witold Pieper, Joachim Gerster
  • Patent number: 7993762
    Abstract: The present invention relates to a magnetic thin film containing a L11 type Co—Pt—C alloy in which atoms are orderly arranged, and can realize an order degree excellent in regard to the L11 type Co—Pt—C alloy to achieve excellent magnetic anisotropy of the magnetic thin film. Therefore, in the various application devices using the magnetic thin film, it is possible to achieve a large capacity process and/or a high density process thereof in a high level.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: August 9, 2011
    Assignees: Tohoku University, Fuji Electric Device Technology Co., Ltd.
    Inventors: Takehito Shimatsu, Hideo Sato, Osamu Kitakami, Satoshi Okamoto, Hajime Aoi, Hiroyasu Kataoka
  • Patent number: 7942985
    Abstract: A soft magnetic alloy for perpendicular magnetic recording medium excellent in saturation magnetic flux density, amorphousness and atmospheric corrosion resistance. The alloy is an Fe—Co based alloy and comprises Fe in an amount satisfying 0.25 to 0.65 of Fe/(Fe+Co) ratio, which is an atomic ratio of Fe and Fe+Co; Zr+Hf in an amount of 6 to 100 at %; Na+Ta in an amount of 0 to 2 at %; Al and/or Cr in an amount of 0 to 5 at %; and the balance Co and unavoidable impurities. A part of Zr and/or Hf can be replaced by B, provided that the amount of B to replace Zr and/or Hf is double in at % of the total amount of Zr and Hf to be replaced and that the total amount of Zr and Hf after replacement is 4 at % or more.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: May 17, 2011
    Assignee: Sanyo Special Steel Co., Ltd.
    Inventors: Toshiyuki Sawada, Akihiko Yanagitani
  • Patent number: 7744702
    Abstract: A soft magnetic alloy powder containing Fe—Ni-based crystal particles is provided as one capable of adequately reducing core loss of a powder magnetic core and achieving satisfactory magnetic characteristics at an effective operating temperature of an element. The present invention provides a soft magnetic alloy powder containing Fe—Ni-based crystal particles containing 45 to 55 mass % Fe and 45 to 55 mass % Ni, relative to a total mass of Fe and Ni, and containing 1 to 12 mass % Co and 1.2 to 6.5 mass % Si, relative to a total mass of Fe, Ni, Co, and Si.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: June 29, 2010
    Assignee: TDK Corporation
    Inventors: Hiroshi Tomita, Hideharu Moro, Kesaharu Takatoh, Koyu Enda
  • Publication number: 20100156579
    Abstract: A ferromagnetic shape memory alloy comprising 25-50 atomic % of Mn, 5-18 atomic % in total of at least one metal selected from the group consisting of In, Sn and Sb, and 0.1-15 atomic % of Co and/or Fe, the balance being Ni and inevitable impurities, which has excellent shape memory characteristics in a practical temperature range, thereby recovering its shape by a magnetic change caused by a magnetic-field-induced reverse transformation in a practical temperature range.
    Type: Application
    Filed: June 27, 2006
    Publication date: June 24, 2010
    Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
    Inventors: Kiyohito Ishida, Katsunari Oikawa, Ryosuke Kainuma, Takeshi Kanomata, Yuji Sutou
  • Patent number: 7691215
    Abstract: The invention relates to inorganic intermetallic compounds having a PMR effect (combined GMR/CMR effect), which are characterized in that they contain at least two elements per formula unit and have a field sensitivity of less than 10% per 0.1 T at temperatures greater than 290 K. The invention also relates to composites consisting of these compounds, to a method for the production thereof an to their use, in particular, as magnetic field sensors or in the domain of spin electronics.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: April 6, 2010
    Assignee: International Business Machines Corporation
    Inventor: Claudia Felser
  • Patent number: 7582171
    Abstract: A high-strength, soft-magnetic iron-cobalt-vanadium alloy selection is proposed, consisting of 35.0?Co?55.0% by weight, 0.75?V?2.5% by weight, O?Ta+2×Nb?0.8% by weight, 0.3<Zr?1.5% by weight, remainder Fe and melting-related and/or incidental impurities. This zirconium-containing alloy selection has excellent mechanical properties, in particular a very high yield strength, high inductances and particularly low coercive forces. It is eminently suitable for use as a material for magnetic bearings used in the aircraft industry.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: September 1, 2009
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Joachim Gerster, Johannes Tenbrink
  • Patent number: 7569115
    Abstract: Assemblages of particles of a magnetic alloy that are suited to magnetic recording are represented by the formula [TXM1-X] containing T and M in a composition ratio where X in the formula is in the range from 0.3 or greater to 0.7 or less, where T is one or two members of the group consisting of Fe and Co and M is one or two members of the group consisting of Pt and Pd, and metallic elements other than T and M that constitute no more than 30 at. % (including 0 at. %) of (T+M) as a percentage of atoms, and the remainder consists of impurities that are unavoidable from a production standpoint, wherein: the face-centered tetragonal fraction is 10-100%, the average grain size as measured by TEM observation (DTEM) is in the range from 5-30 nm, the x-ray crystal grain size derived by x-ray diffraction (DX) is no less than 4 nm, the particles of are dispersed from each other at a distance, and the dispersion on the composition of the individual particles is kept within a stipulated range.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: August 4, 2009
    Assignee: Dowa Electronics Materials Co., Ltd.
    Inventor: Kimitaka Sato
  • Publication number: 20090050240
    Abstract: A magnetic metal powder having fluidity is provided which is composed of FePt nanoparticles synthesized by the polyol synthesis method that possess fct (face-centered tetragonal) structure and exhibit crystal magnetic anisotropy from immediately after synthesis. Specifically, there is provided a magnetic metal powder having fluidity which is composed of magnetic metal particles whose main components and the contents thereof are represented by the following general formula (1): [TXM1?X]YZ1?Y??(1), where T is one or both of Fe and Co, M is one or both of Pt and Pd, Z is at least one member selected from the group composed of Ag, Cu, Bi, Sb, Pb and Sn, X represents 0.3˜0.7, and Y represents 0.7˜1.
    Type: Application
    Filed: October 15, 2008
    Publication date: February 26, 2009
    Inventor: Kazuyuki Tohji
  • Patent number: 7465363
    Abstract: A single phase consisting of a ThMn12 phase can be obtained by having the composition thereof represented by a general formula R(Fe100-y-wCowTiy)xSizAv (in the general formula, R is at least one element selected from rare earth elements (here the rare earth elements signify a concept inclusive of Y), Nd accounts for 50 mol % or more of R, and A is N and/or C) in which the molar ratios in the general formula are such that x=10 to 12.5, y=(8.3?1.7×z) to 12.3, z=0.1 to 2.3, v=0.1 to 3 and w=0 to 30, and the relation (Fe+Co+Ti+Si)/R>12 is satisfied.
    Type: Grant
    Filed: January 28, 2004
    Date of Patent: December 16, 2008
    Assignee: TDK Corporation
    Inventors: Atsushi Sakamoto, Makoto Nakane, Hideki Nakamura, Akira Fukuno
  • Patent number: 7195680
    Abstract: The invention relates to a soft magnetic alloy with the following composition in wt. %: 28%?Ni?34%, 0%?Co?4%, 0%?Cu?4%, 1%?Cr, 0%?Mo?8%, 0%?Nb?1%, 0%?Mn?2%, 0%?V?5%, 0%?W?5%, 0%?Si?4%, 0%?Al?4%, 0%?C?0.4%, optionally one or several elements selected from magnesium and calcium the content of which is such as to remain below 0.1%, the rest being iron and impurities from production. The chemical composition furthermore satisfies the following relationships: 180.5?6×Ni2.5×(Cr+Mo+V+W+Si+Al)+4×(Co+Cu)?197.5 et Co+Cu?4%. The invention relates to the use thereof for production of a stator for use in a motor for clock-making.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: March 27, 2007
    Assignee: Imphy Alloys
    Inventors: Thierry Waeckerle, Hervë Fraisse, Bruno Boulogne
  • Patent number: 7192491
    Abstract: In order to dampen magnetization changes in magnetic devices, such as magnetic tunnel junctions (MTJ) used in high speed Magnetic Random Access Memory (MRAM), a transition metal selected from the 4d transition metals and 5d transition metals is alloyed into the magnetic layer to be dampened. In a preferred form, a magnetic permalloy layer is alloyed with osmium (Os) in an atomic concentration of between 4% and 15% of the alloy.
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: March 20, 2007
    Assignee: International Business Machines Corporation
    Inventors: Snorri T. Ingvarsson, Roger H. Koch, Stuart S. Parkin, Gang Xiao
  • Patent number: 7048809
    Abstract: Magnetic powder having a large coercivity, Hc, is consolidated with a non-magnetic binder to form a magnetic implement having desired dimension and shape. The magnetic implement exhibits a linear B-H loop and low magnetic loss. It is capable of operating under a wide magnetic field range, and finds use current and pulse transformers, inductors carrying large electrical current, stable bandpass filters, and the like.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: May 23, 2006
    Assignee: Metglas, Inc.
    Inventors: Ryusuke Hasegawa, Vincent H. Hammond, James M. O'Reilly
  • Patent number: 6946097
    Abstract: A high strength and creep resistant soft magnetic Fe—Co alloy includes, in weight %, Fe and Co such that the difference between the Fe and Co is at least 2%, at least 35% Co, and 2.5%?(V+Mo+Nb), wherein 0.4%?Mo and/or 0.4%?Nb. This alloy can further include B, C, W, Ni, Ti, Cr, Mn and/or Al. A vanadium-free high strength soft magnetic Fe—Co alloy includes, in weight %, Fe and Co such that the difference between the Fe and Co is at least 2%, and at least 15% Co, the alloy further satisfying (0.1%?Nb and 0.1%?W) or 0.25%?Mn. This alloy can further include B, C, Ni, Ti, Cr and/or Al.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: September 20, 2005
    Assignee: Philip Morris USA Inc.
    Inventors: Seetharama C. Deevi, Rangaraj S. Sundar
  • Patent number: 6822831
    Abstract: An object of the present invention is to provide a recording head having a magnetic pole simultaneously possessing a high saturation magnetic flux density, a high permeability and a high electric resistivity, and the magnetic pole of the recording head is a polycrystalline film comprising Fe whose content is not less than 57.5 atomic % and not more than 94.5 atomic %; one or more kinds of elements selected from the element group of Al, B, Ga, Si, Ge, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and Rh, whose whole content is not less than 1 atomic % and not more than 15 atomic %; N whose content is not less than 0.5 atomic % and not more than 10 atomic %; and O whose content is not less than 1.5 atomic % and not more than 22.5 atomic %.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: November 23, 2004
    Assignee: Fujitsu Limited
    Inventors: Shoji Ikeda, Yuji Uehara, Ikuya Tagawa, Naoki Takeguchi, Masahiro Kakehi
  • Patent number: 6676772
    Abstract: The magnetic material for magnetic refrigeration of the present invention is characterized by exhibiting, in a certain temperature region, preferably, only in part of a temperature region from 200 K to 350 K, an inflection point at which a second order differential coefficient of a magnetization curve changes from positive to negative with respect to a magnetic field, within the range of this magnetic field formed using a permanent magnet unit. This magnetic material of the present invention can generate a low temperature by using a relatively low magnetic field, by transferring the entropy between the electron spin system and the lattice system near the temperature at which an inflection point appears on the magnetization curve. Examples of the magnetic material meeting this condition are La(Fe,Si)13, (Hf,Ta)Fe2, (Ti,Sc)Fe2, and (Nb,Mo)Fe2, each containing 50 to 60 atomic % of transition metals such as Fe.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: January 13, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akiko Saito, Tadahiko Kobayashi, Takao Sawa, Masashi Sahashi
  • Patent number: 6666930
    Abstract: The present invention offers a minute-sized magnet with superior magnetic energy product (BH)max and coercivity iHc, as well as superior anti-corrosive properties. This magnet is comprised of an alloy comprised of 35-55 atomic % platinum, 0.001-10 atomic % third element, which is one or more elements from groups IVa, Va, IIIb, or IVb, and a remainder of iron and other unavoidable impurities. The average crystal size of this FePt alloy is 0.3 &mgr;m. By mixing an FePt alloy with a specific element in a designated ratio, an FePt magnet with more excellent characteristics than ones made from previous alloys was successfully made.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: December 23, 2003
    Assignee: Aichi Steel Corporation
    Inventors: Hitoshi Aoyama, Yoshinobu Honkura, Takumi Asano
  • Patent number: 6607612
    Abstract: The magnetic alloy includes cobalt (Co), chromium (Cr), and germanium (Ge), the composition of the magnetic alloy being represented by the general formula: CoxCryGez where x, y and z, which represent the composition ratio in terms of atomic %, satisfy the relationships: 78≦x≦87, 2.5≦y≦14.5, 3.5≦z≦15 and x+y+z=100. The magnetic alloy may have a composition represented by the formulas: CoCrGeT (T represents one or more elements of Ta, Si, Nb, B, Ni and Pt) or a composition represented by the formula: CoCrGeT′ (T′ represents one or more elements of Ta, B, and Pt).
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: August 19, 2003
    Assignees: Fuji Electric Co., Ltd., Showa Denko K.K.
    Inventor: Migaku Takahashi
  • Patent number: 6527880
    Abstract: Medium- and high-density articles are formed from melting and casting alloys containing tungsten, iron, nickel and optionally manganese and/or steel. In some embodiments, the articles have densities in the range of 8-10.5 g/cm3, and in other embodiments, the articles have densities in the range of 10.5-15 g/cm3. In some embodiments, the articles are ferromagnetic, and in others the articles are not ferromagnetic. In some embodiments, tungsten forms the largest weight percent of the alloy, and in other embodiments the alloy contains no more than 50 wt % tungsten. In some embodiments, the articles are shell shot.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: March 4, 2003
    Inventor: Darryl D. Amick
  • Patent number: 6514358
    Abstract: Magnetic materials for use in sputtering targets are hot rolled and stretched at ambient temperature or at a temperature not exceeding 1400° F. The magnetic material can be pure Co, pure Ni, or Co based alloys.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: February 4, 2003
    Assignee: Heraeus, Inc.
    Inventors: Michael Bartholomeusz, Michael Tsai
  • Patent number: 6342108
    Abstract: A ferromagnetic powder comprising ferromagnetic particles coated with a material that does not degrade at temperatures above 150° C and permits adjacent particles to strongly bind together after compaction such that parts made from the ferromagnetic powder have a transverse rupture strength of about 8,000 to about 20,000 pounds/square inch before sintering. The coating includes from 2 to 4 parts of an oxide and one part of a chromate, molybdate, oxalate, phosphate, or tungstate. The coating may be substantially free of organic materials. The invention also includes a method of making the ferromagnetic powder, a method of making soft magnetic parts from the ferromagnetic powder, and soft magnetic parts made from the ferromagnetic powder.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: January 29, 2002
    Assignee: Materials Innovation, Inc.
    Inventors: David S. Lashmore, Glenn L. Beane, Lev Deresh, Zonglu Hua
  • Patent number: 6270593
    Abstract: Mn alloy materials for magnetic materials contain 500 ppm or less, preferably 100 ppm or less, oxygen, 100 ppm or less, probably 20 ppm or less, sulfur, and preferably a total of 1000 ppm or less, more preferably 500 ppm or less, impurities (elements other than Mn and the alloying component). The alloying component that forms an alloy with Mn is one or two or more elements selected from the group consisting of Fe, Ir, Pt, pd, Rh, Ru, Ni, Cr and Co. Sputtering targets formed from the Mn alloy materials for use in depositing magnetic thin film, and the thin films so produced.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: August 7, 2001
    Assignee: Japan Energy Corporation
    Inventors: Yuichiro Shindo, Tsuneo Suzuki
  • Patent number: 6190465
    Abstract: Soft magnetic alloy of the iron-nickel type, the chemical composition of which comprises, by weight: 40%≦Ni+Co≦65%; 0%≦Co≦7%; 2%≦Cr≦5%; 1%≦Ti≦3%; 0%≦Al≦0.5%; 0%≦Mn+Si≦2%; optionally, up to 3% Mo, 2% W, 2% V, 1.5% Nb, 1% Ta and 3% Cu, the sum of the Cr, Mo, W, V, Nb, Ta and Cu contents being less than 7% and the sum of the Mo, W, V, Nb, Ta and Cu contents being less than 4%; the balance being iron and impurities, such as carbon, sulfur and phosphorus, resulting from the smelting process, the chemical composition furthermore satisfying the relationships: Cr<5−0.015×(Ni+Co−52.5)2, if: Ni+Co≦52.5; Cr<5−0.040×(Ni+Co−52.5)2, if: Ni+Co≧52.5; the alloy having a saturation induction Bs of greater than 0.9 tesla, a coercive field of less than 10 A/m, an electrical resistivity p of greater than 60 &mgr;&OHgr;.cm and a hardness of greater than 200 HV. Process for manufacturing the alloy and uses.
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: February 20, 2001
    Assignee: Imphy Ugine Precision
    Inventors: Lucien Coutu, Laurent Chaput, Thierry Waeckerle
  • Patent number: 6146474
    Abstract: An iron--cobalt alloy the chemical composition of which comprises, by weight: 35%.ltoreq.Co.ltoreq.55%; 0.5%.ltoreq.V.ltoreq.2.5%; 0.02%.ltoreq.Ta+2.times.Nb.ltoreq.0.2%; 0.0007%.ltoreq.B.ltoreq.0.007%; C.ltoreq.0.05%; the balance being iron and impurities resulting from the smelting operation.
    Type: Grant
    Filed: January 15, 1999
    Date of Patent: November 14, 2000
    Assignee: Imphy Ugine Precision
    Inventors: Lucien Coutu, Laurent Chaput
  • Patent number: 6132524
    Abstract: A semiconductor magneto-optical material includes a semiconductor dispersed with fine magnetic material particles and is characterized by exhibiting magneto-optical effect at ordinary room temperature.
    Type: Grant
    Filed: January 15, 1998
    Date of Patent: October 17, 2000
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry, Tokin Corporation
    Inventors: Hiroyuki Akinaga, Koichi Onodera
  • Patent number: 6123783
    Abstract: A method for making a magnetic data storage target includes warm-rolling a magnetic alloy sheet at a temperature of less than about 1200.degree. F., optimally followed by annealing. The method results in increased pass-through-flux (PTF) and improved performance in magnetron sputtering applications.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: September 26, 2000
    Assignee: Heraeus, Inc.
    Inventors: Michael Bartholomeusz, Michael Tsai
  • Patent number: 6103405
    Abstract: A planar inductance element is provided which has good high-frequency magnetic properties and which can be manufactured at high yield. The element has at least one ferromagnetic film which, whose high-frequency properties change only a little when thermal, magnetic and mechanical stresses are applied to them during the manufacture of the element. The film has high process immunity. The film has been formed by applying a stress in a plane of a ferromagnetic film having uniaxial magnetic anisotropy or forming an antiferromagnetic film on such a ferromagnetic film, and by heat-treating the resultant structure in a magnetic field, thereby inducing inplane unidirectional magnetic anisotropy in a prescribed direction. The ferromagnetic film thus formed has its high-frequency permeability improved and its high-frequency loss reduced. In forming the ferromagnetic film, the inplane unidirectional magnetic anisotropy may be induced at an angle of about 30.degree. or about 60.degree.
    Type: Grant
    Filed: February 3, 1998
    Date of Patent: August 15, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiroshi Tomita
  • Patent number: 6018296
    Abstract: A resonator for use in a marker in a magnetomechanical electronic article surveillance system is formed by a planar strip of an amorphous magnetostrictive alloy having a composition Fe.sub.a Co.sub.b Ni.sub.c Si.sub.x B.sub.y M.sub.z wherein a, b, c, x, y, and z are at % and a+b+c+x+y+z=100, a+b+c>75, a>15, b<20, c>5 and z<3, wherein M is at least one element selected from the group consisting of C, P, Ge, Nb, Mo, Cr and Mn, the amorphous magnetostrictive alloy having a resonant frequency f.sub.r which is a minimum at a field strength H.sub.min and having a linear B-H loop up to at least a field strength which is about 0.8 H.sub.min and a uniaxial anisotropy perpendicular to the plane of the strip with an anisotropy field strength H.sub.k which is at least as large as H.sub.min and, when driven by an alternating signal burst in the presence of a bias field H.sub.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: January 25, 2000
    Assignee: Vacuumschmelze GmbH
    Inventor: Giselher Herzer
  • Patent number: 5976715
    Abstract: The invention is embodied in a soft magnetic thin film article comprising an iron--chromium-nitrogen (Fe--Cr--N) based alloy and methods for making such article. The soft magnetic thin film article is formed using an iron--chromium--nitrogen based alloy with tantalum in one embodiment and with at least one of the elements titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), molybdenum (Mo), niobium (Nb) or tungsten (W) in another embodiment. The article is formed such that the alloy has a relatively high saturation magnetization (e.g., greater than approximately 15 kG) and a relatively low coercivity (e.g., less than approximately 2.0 oersteds) in an as-deposited condition or, alternatively, with a very low temperature treatment (e.g., below approximately 150.degree. C.). The inventive films are suitable for use in electromagnetic devices, for example, in microtransformer cores, inductor cores and in magnetic read-write heads.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: November 2, 1999
    Assignee: Lucent Techologies Inc.
    Inventors: Li-Han Chen, Sungho Jin, Wei Zhu, Robert Bruce van Dover
  • Patent number: 5858125
    Abstract: A magnetoresistive material of the present invention has a structure in which many clusters are surrounded by a crystal phase of Cu and/or Ag, where each cluster has a grain size of 20 nm or less and composed of an amorphous phase containing at least one ferromagnetic metal element T as a main component selected from Fe, Co and Ni, and at least one element M selected from Ti, Zr, Hf, V, Nb, Ta, Mo and W.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: January 12, 1999
    Assignee: Alps Electric Co., Ltd.
    Inventor: Naoya Hasegawa
  • Patent number: 5824165
    Abstract: The inventive material exhibits giant magnetoresistance upon application of an external magnetic field at room temperature. The hysteresis is minimal. The inventive material has a magnetic phase formed by eutectic decomposition. The bulk material comprises a plurality of regions characterized by a) the presence of magnetic lamellae wherein the lamellae are separated by a distance smaller than the mean free path of the conduction electrons, and b) a matrix composition having nonmagnetic properties that is interposed between the lamellae within the regions. The inventive, rapidly quenched, eutectic alloys form microstructure lamellae having antiparallel antiferromagnetic coupling and give rise to GMR properties. The inventive materials made according to the inventive process yielded commercially acceptable quantities and timeframes. Annealing destroyed the microstructure lamellae and the GMR effect. Noneutectic alloys did not exhibit the antiparallel microstructure lamellae and did not possess GMR properties.
    Type: Grant
    Filed: September 1, 1995
    Date of Patent: October 20, 1998
    Assignee: The Regents, University of California
    Inventors: Johannes J. Bernardi, Gareth Thomas, Andreas R. Huetten
  • Patent number: 5728237
    Abstract: Amorphous alloys having the formulaFe.sub.a Co.sub.b Ni.sub.c Si.sub.x B.sub.y M.sub.zare employed as monitoring strips for mechanically oscillating tags, for example for anti-theft protection, together with a source of a pre-magnetization field in which the strip is disposed so as to place the strip in an activated state. In the formula, M denotes one or more elements of groups IV through VII of the periodic table, including C, Ge and P, and the constituents in at % meet the following conditions: a lies between 20 and 74, b lies between 4 and 23, c lies between 5 and 50, with the criterion that b+c>14, x lies between 0 and 10, y lies between 10 and 20, and z lies between 0 and 5 with the sum x+y+z being between 12 and 21. These alloys have a resonant frequency associated therewith and when passed through an alternating field whose alternation frequency coincides with the resonant frequency, a pulse having a signal amplitude is produced.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: March 17, 1998
    Assignee: Vacuumschmelze GmbH
    Inventor: Giselher Herzer
  • Patent number: 5650023
    Abstract: A glassy metal alloy consists essentially of the formula Fe.sub.a Co.sub.b Ni.sub.c M.sub.d B.sub.c Si.sub.f C.sub.g, where "M" is at least one member selected from the group consisting of molybdenum, chromium and manganese, "a-g" are in atom percent, "a" ranges from about 30 to about 45, "b" ranges from about 4 to about 40, "c" ranges from about 5 to about 45, "d" ranges from about 0 to about 3, "3" ranges from about 10 to about 25, "f" ranges from about 0 to about 15 and "g" ranges from about 0 to about 2. The alloy can be cast by rapid solidification into ribbon, annealed to enhance magnetic properties, and formed into a marker that is especially suited for use in magneto-mechanically actuated article surveillance systems. Advantageously, the marker is characterized by relatively linear magnetization response in the frequency regime wherein harmonic marker systems operate magnetically.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 22, 1997
    Inventors: Ryusuke Hasegawa, Ronald Martis
  • Patent number: 5628840
    Abstract: A glassy metal alloy consists essentially of the formula Fe.sub.a Co.sub.b Ni.sub.c M.sub.d B.sub.e Si.sub.f C.sub.g, where "M" is at least one member selected from the group consisting of molybdenum, chromium and manganese, "a-g" are in atom percent, "a" ranges from about 30 to about 45, "b" ranges from about 4 to about 40, "c" ranges from about 5 to about 45, "d" ranges from about 0 to about 3, "3" ranges from about 10 to about 25, "f" ranges from about 0 to about 15 and "g" ranges from about 0 to about 2. The alloy can be cast by rapid solidification into ribbon or otherwise formed into a marker that is especially suited for use in magneto-mechanically actuated article surveillance systems. Advantageously, the marker is characterized by relatively linear magnetization response in the frequency regime wherein harmonic marker systems operate magnetically.
    Type: Grant
    Filed: April 13, 1995
    Date of Patent: May 13, 1997
    Assignee: AlliedSignal Inc.
    Inventor: Ryusuke Hasegawa
  • Patent number: 5549766
    Abstract: A permanent magnet is composed of a magnetic material which is represented by a general formula R1.sub.x R2.sub.y A.sub.z Co.sub.u Fe.sub.100-x-y-z-u (where R1 is at least one element selected from rare earth elements, R2 is at least one element selected from the group consisting of Sc, Zr and Hf, A is at least one element selected from the group of C, N and P, and x,y,z and u are atomic percent defined as 2.ltoreq.x, 4.ltoreq.x+y.ltoreq.20, 0.ltoreq.z.ltoreq.20, 0.ltoreq.u.ltoreq.70), wherein the material includes a principal phase of TbCu.sub.7 structure and .alpha.-Fe, a peak width at half height of the main peak of X-ray diffraction of the principal phase obtained by using Cu-K.alpha. X-rays with the resolution of 0.02.degree. or less is about 0.8.degree. or less, and a ratio of peak intensity between the principal phase and .alpha.-Fe satisfies a relation that the value of I.sub.Fe /(I.sub.p +I.sub.Fe) is about 0.4 or less where I.sub.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: August 27, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akihiko Tsutai, Takahiro Hirai, Shinya Sakurada
  • Patent number: RE38098
    Abstract: Amorphous alloys having the formula Fea Cob Nic Six By Mz are employed as monitoring strips for mechanically oscillating tags, for example for anti-theft protection, together with a source of a pre-magnetization field in which the strip is disposed so as to place the strip in an activated state. In the formula, M denotes one or more elements of groups IV through VII of the periodic table, including C, Ge and P, and the constituents in at % meet the following conditions: a lies between 20 and 74, b lies between 4 and 23, c lies between 5 and 50, with the criterion that b+c>14, x lies between 0 and 10, y lies between 10 and 20, and z lies between 0 and 5 with the sum x+y+z being between 12 and 21. These alloys have a resonant frequency associated therewith and when passed through an alternating field whose alternation frequency coincides with the resonant frequency, a pulse having a signal amplitude is produced.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: April 29, 2003
    Assignee: Vacuumschmelze GmbH
    Inventor: Giselher Herzer