Magnetic Coating Patents (Class 427/128)
  • Patent number: 6602544
    Abstract: A composite fiber made from natural and/or synthetic fibers having mineral compounds such as gemstones, colors and wavelengths, piezoelectric crystals and magnets whereby said fabrics can be placed against the body, such as the longitudinal lines of acupuncture points called meridians, the chakra system and/or circulatory systems for the purpose of transporting and channeling energy. The methods of combining the gemstones with the natural/synthetic fibers include encasing the mineral compounds within the natural/synthetic fibers by bonding the mineral compounds to the natural/synthetic fibers or laminating the mineral compound or compounds to the natural/synthetic fiber.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: August 5, 2003
    Inventor: Veronica Piselli
  • Patent number: 6599608
    Abstract: Substantially spherical magneto-plumbite ferrite (barium or strontium ferrite) particles are formed from well-dispersed ultra-fine substantially spherical iron-based oxide and/or hydroxide particles as precursor particles. The precursor particles are mixed with a colloidal barium or strontium carbonate (BaCO3 or SrCO3), and with small amounts of a byproduct, such as sodium or potassium chloride (NaCl or KCl) or hydroxide (NaOH or KOH) or nitrate (NaNO3 or KNO3), functioning as a flux to lower the calcination temperature. The particles are filtered out of the mixture, dried, and calcined for a time sufficiently long and/or at a temperature sufficiently high to form magneto-plumbite ferrite from the precursor particles, and for a time sufficiently short and/or a temperature sufficiently low to maintain the general spherical shape of the precursor particles.
    Type: Grant
    Filed: July 8, 2002
    Date of Patent: July 29, 2003
    Assignee: Idaho Research Foundation, Inc.
    Inventors: Yang-Ki Hong, Hong Sik Jung, Patrick R. Taylor
  • Patent number: 6596341
    Abstract: Magnetic recording media exhibiting high SNR and high thermal stability are produced by sputter depositing a magnetic alloy overlying a non-magnetic substrate, e.g., on an underlayer, heating to eliminate thermally unstable small grains thereby increasing the average grain size of the magnetic alloy layer but narrowing the grain size distribution, depositing a layer comprising a non-ferromagnetic element, and then heating to diffuse the non-ferromagnetic element into the grain boundaries of the heat treated magnetic alloy layer. Embodiments include sputter depositing a magnetic alloy layer comprising Co and Pt on an underlayer, heating at a temperature of about 150° C. to about 600° C. to increase the average grain size to about 8 to about 10 nm, depositing a layer comprising Cr, Mn or Ta, at a thickness up to about 25 Å, e.g., up to about 10 Å, on the magnetic alloy layer and heating to diffuse the Cr, Mn or Ta into the grain boundaries of the magnetic alloy layer.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: July 22, 2003
    Assignee: Seagate Technology LLC
    Inventors: Jing Gui, Gary Clark Rauch
  • Patent number: 6596368
    Abstract: An organic substrate having optically-active layers deposited by magnetron sputtering and a preparation process for it are provided. Gas pressure used for carrying out better adhesion by sputtering is high, comprised between 0.8 and 5.0 Pa. Sputtering is particularly suitable for targets of Si, Ti, Zr and organic substrates with or without anti-abrasive coating. Improved adhesion of thin films is obtained.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: July 22, 2003
    Assignee: Essilor International
    Inventors: Jöm-Steffen Liebig, Klaus Goedicke, Volker Kirchhoff, Gerhard Keller, Richard Bosmans, Pascal Comble
  • Patent number: 6594884
    Abstract: A method of making a multifilm structure is provided for a pinned layer structure of a spin valve sensor for increasing the magnetoresistive coefficient (dr/R) of the sensor and/or decreasing a ferromagnetic coupling field (HF) between the pinned layer structure and the free layer of the sensor. The multifilm structure for the pinned layer in one or both AP layers of an AP pinned layer structure or a single pinned layer structure includes a nickel iron (NiFe) middle layer which is located between a cobalt (Co) first film and a cobalt (Co) second film.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: July 22, 2003
    Assignee: International Business Machines Corporation
    Inventor: Mustafa Pinarbasi
  • Patent number: 6592935
    Abstract: A method of manufacturing electric machines comprised of geometrically patterned arrays of permanent magnets, soft magnetic materials, and electrical conductors deposited by kinetic spraying methods directly atop a carrier. The magnets and planar coils of the present invention may be integrally formed atop carriers to form electrical machines such as motors, generators, alternators, solenoids, and actuators. The manufacturing techniques used in this invention may produce highly defined articles that do not require additional shaping or attaching steps. Very high-purity permanent and soft magnetic materials, and conductors with low oxidation are produced.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: July 15, 2003
    Assignee: Ford Motor Company
    Inventors: Franco Leonardi, John Matthew Ginder, Robert Corbly McCune
  • Patent number: 6591483
    Abstract: A method is provided for depositing a spatially fine pattern of magnets on a substrate. The substrate can be fabricated from any number of materials, such as plastics, metals or ceramics. When sufficiently magnetized, the magnets will provide a magnetic field that can be sensed by a magnetic proximity sensor, to determine the position of the magnets. The magnets can be arranged in a plurality of patterns, including radial or linear arrangements. The ability to arrange these magnets in varying patterns provides a wide capability of magnetic sensing applications.
    Type: Grant
    Filed: April 4, 2000
    Date of Patent: July 15, 2003
    Assignee: The Cherry Corporation
    Inventor: Nicholas W. Kay
  • Patent number: 6589669
    Abstract: A magnetic recording medium according to the invention includes a plastic substrate, a non-magnetic under-layer on the substrate, a magnetic layer including cobalt on the under-layer, a protective film on the magnetic layer, and a liquid lubricant layer on the protective film. The under-layer is composed of a chromium alloy having a body centered cubic lattice structure, and containing at least one element selected from the group consisting of Zr, Nb, Mo, Ru and Pd in a total amount of at least 15 at %, or containing at least one element selected from the group consisting of Hf, Ta, W, Re, Pt and Au in a total amount of at least 10 at %. The amount of cobalt dissolved out of the magnetic layer is limited by performing sputtering deposition of at least the magnetic layer at low pressures of argon.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: July 8, 2003
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Hiroyuki Uwazumi, Tadaaki Oikawa
  • Publication number: 20030118719
    Abstract: The invention relates to a method for producing a marking device (1), according to which a coding coating is applied to the surface of a support (2). The coding coating comprises at least one magnetic base layer (3), at least one magnetic coding layer (5) and a non-magnetic intermediate layer (4) placed therebetween. Said intermediate layer is composed in such a way that areas of non-parallel or anti-parallel magnetic coupling occur. The invention is characterized in that zones on the surface of the support (2) are roughened, before the coding coating is applied. The invention also relates to apparatus for carrying out said method.
    Type: Application
    Filed: October 16, 2002
    Publication date: June 26, 2003
    Inventors: Jan Morenzin, Daniel Schondelmaier, Wolfgang Eberhardt
  • Patent number: 6579635
    Abstract: A ferromagnetic film suitable for ultra-high density perpendicular recording, and a process for producing the film. The process generally entails forming a film of ferromagnetic material on a surface of a substrate, such that the film is characterized by perpendicular magnetic anisotropy and comprises a plurality of magnetic domains defined by domain walls perpendicular to a major surface of the film. The ferromagnetic film is formed to have a linear strain defect for the purpose of smoothing and stabilizing the domain walls during subsequent magnetization reversal of the ferromagnetic material. Such smoothing and stabilizing serves to control temporal magnetic noise due to motion of magnetic domains, arrest domain wall motion (reducing velocity) when the film is subjected to the magnetic reversal fields, and controls spatial magnetic noise due to domain wall jaggedness.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: June 17, 2003
    Assignee: International Business Machines Corporation
    Inventors: Lia Krusin-Elbaum, Takasada Shibauchi
  • Publication number: 20030107832
    Abstract: The invention relates to a marking device (1, 11) for the identification of objects with a coding of regions (4, 5, 13) with different magnetic properties. The marking device is characterized in that magnetic regions (4, 5, 13) are so magnetically biased that their hysteresis loops (7, 8, 15) are shifted on the field strength axis (H) relative to the magnetization axis (M).
    Type: Application
    Filed: September 26, 2002
    Publication date: June 12, 2003
    Inventors: Jan Morenzin, Daniel Schondelmaier, Wolfgang Eberhardt
  • Publication number: 20030099770
    Abstract: A method for producing a disk-shaped substrate 10 used for producing an optical disk includes: (a) forming a protective layer 12a that is larger in area than the disk-shaped substrate 10 on a surface of a transparent plate 11a; and (b) cutting a portion of the plate 11a with the protective layer 12a formed thereon other than an outer edge portion of the protective layer 12a to form a disk shape. According to this producing method, a thin substrate can be prevented from being damaged by forming a protective layer. Furthermore, according to this producing method, a protective layer with a uniform thickness can be formed.
    Type: Application
    Filed: October 24, 2002
    Publication date: May 29, 2003
    Inventors: Kazuhiro Hayashi, Kazuya Hisada, Eiji Ohno
  • Publication number: 20030099771
    Abstract: A high performance specular free layer bottom spin valve is disclosed. This structure made up the following layers: NiCr/MnPt/CoFe/Ru/CoFe/Cu/free layer/Cu/Ta or TaO/Al2O3. A key feature is that the free layer is made of a very thin CoFe/NiFe composite layer. Experimental data confirming the effectiveness of this structure is provided, together with a method for manufacturing it and, additionally, its longitudinal bias leads.
    Type: Application
    Filed: November 12, 2002
    Publication date: May 29, 2003
    Applicant: HEADWAY TECHNOLOGIES, INC.
    Inventors: Cheng T. Horng, Mao-Min Chen, Min Li, Ru-Ying Tong
  • Publication number: 20030099769
    Abstract: The coating apparatus and method enable the coating liquid having been scraped-off to be reused without doing any one of the fluid adjusting treatment and the filtering treatment, while maintaining the features of the scraping-off type of extrusion coater, which is suitable for obtaining a uniform and extremely thin coating film. The coating head is provided with two slits: a coating slit and a recovering slit, and the excessive coating liquid having been discharged through the coating slit and applied to the web is scraped-off and recovered through the recovering slit.
    Type: Application
    Filed: September 25, 2002
    Publication date: May 29, 2003
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventors: Toshihiro Mandai, Mikio Tomaru, Norio Shibata
  • Patent number: 6567236
    Abstract: An antiferromagnetically coupled layer structure for magnetic recording wherein the top ferromagnetic structure is a bilayer structure including a relatively thin first sublayer of ferromagnetic material in contact with the coupling/spacer layer. The first sublayer has a higher magnetic moment than the second sublayer. The layer structure of the invention results improved manufacturability and improved performance. A preferred embodiment of a layer structure according to the invention includes: a bottom ferromagnetic layer preferably of CoCr; an antiferromagnetic coupling/spacer layer preferably of Ru; and a top ferromagnetic structure including a thin first sublayer of material preferably of CoCr, CoCrB or CoPtCrB, and a thicker second sublayer of material preferably of CoPtCrB with a lower moment than the first sublayer.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: May 20, 2003
    Assignee: International Business Machnes Corporation
    Inventors: Mary Frances Doerner, Eric E. Fullerton, David T. Margulies, Kai Tang
  • Patent number: 6565929
    Abstract: The method of manufacturing the magnetic medium for data storage comprising magnetic segments (5) for data storage which alternate regularly with nonmagnetic segments, which method comprises deposition on a substrate (1) from a nonmagnetic material a material having low or zero initial magnetization and capable of varying its magnetic characteristics under the effect of irradiation. The mentioned material is laid on the substrate (1) as a layer (2) in a thickness corresponding to one of the overall size values of any one of the magnetic segment (5) being formed. Then the applied layer (2) is selectively irradiated so as to vary the magnetic characteristics of the material of the layer (2) on the irradiated segments before forming the magnetic segments (5) each having a maximum overall size the ratio between which and any other overall size of this magnetic segment is from 3.5:1 to 15:1.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: May 20, 2003
    Assignee: Obschestvo s organichennoi otvetstvennostju “Laboratoria Ionnykh Nanotekhnology” (OOO “Labintech”)
    Inventors: Boris Aronovich Gurovich, Dmitry Losifovich Dolgy, Evgeny Zalmanovich Meylikhov, Evgeny Pavlovich Velikhov, Vladimir Borisovich Betelin, Evgenia Anatolievna Kuleshova, Evgeny Dmitrievich Olshansky, Boris Aronovich Aronzon, Alexandr Viktorovich Kalinin
  • Patent number: 6562488
    Abstract: A magnetic recording medium on glass or Al substrates with film structures of CrV/NiAl/CrMo/CoCrTa/CoCrPtTaNbB and CrMo/CoCrTa/CoCrPtTaNbB exhibit high coercivity and high signal-to-medium noise ratio. The medium can be used for high-density longitudinal magnetic recording. Embodiments include forming a sub-seed layer on a NiP-plated aluminum substrate, and sequentially depositing a seed layer, an underlayer, an intermediate layer and a magnetic layer on the substrate. The magnetic layer contains at least six elements, including Co, Cr and B.
    Type: Grant
    Filed: February 2, 2000
    Date of Patent: May 13, 2003
    Assignee: Seagate Technology LLC
    Inventors: Qixu (David) Chen, Samuel Dacke Harkness, IV, Zhong (Stella) Wu, Lin Huang, Rajiv Yadav Ranjan, Charles Leu
  • Patent number: 6562489
    Abstract: A magnetic recording medium is constructed to include a substrate, a magnetic layer made of a Co or Co-based alloy, and an underlayer disposed between the substrate and the magnetic layer. The underlayer is made of an ordered intermetallic material of FCC L12 or FCT L10 crystalline structure, so that c-axis of the magnetic layer is aligned in a predetermined direction.
    Type: Grant
    Filed: May 4, 2001
    Date of Patent: May 13, 2003
    Assignee: Fujitsu Limited
    Inventors: E. Noel Abarra, Iwao Okamoto
  • Patent number: 6562199
    Abstract: There is disclosed a manufacturing method of a magnetoresistive element of the present invention, comprising: a step of preparing a substrate having a thermal conductivity in a range of 5 to 150 Wm−1K−1; a substrate cooling step of moving the substrate into a vacuum cooling chamber, and cooling the substrate at an absolute temperature of 200 K or less in the vacuum cooling chamber; and a laminated film forming step of moving the cooled substrate into a vacuum film forming chamber, fixing the substrate to a substrate holder, and forming a magnetoresistive laminated film on the substrate while rotating the substrate, so that the manufacturing method of the magnetoresistive element is little in dispersion of element property, high in reliability, and superior in productivity.
    Type: Grant
    Filed: November 5, 2001
    Date of Patent: May 13, 2003
    Assignee: TDK Corporation
    Inventors: Koji Shimazawa, Yoshihiro Tsuchiya
  • Publication number: 20030082396
    Abstract: Thin, flexible composite materials, which are magnetic or magnetizable and processes for producing and using the materials. The composite material contains a laminate formed from a mixture of magnetic or magnetizable particles, binder particles (and optionally active particles), applied to and fused and/or coalesced with a first substrate. The composite preferably contains an additional second substrate fused to and/or coalesced with, the laminate on the side of the laminate opposite that of the first substrate.
    Type: Application
    Filed: October 26, 2001
    Publication date: May 1, 2003
    Inventor: Evan E. Koslow
  • Publication number: 20030072886
    Abstract: A method of forming a liquid film characterized by dropping a liquid on a substrate from a dropping unit while rotating the substrate, moving the dropping unit in the radial direction from the inner periphery of the substrate to the outer periphery of the substrate so that the move pitch of the dropping unit in the radial direction occurring in every revolution of the substrate may change slightly, and forming a liquid film on the substrate by adjusting the feed speed of the liquid to the substrate from the dropping unit, while lowering the rotational frequency of the substrate gradually, so that the liquid on the substrate may not move due to centrifugal force by rotation of the substrate, along with the move of the dropping unit in the radial direction of the substrate.
    Type: Application
    Filed: July 25, 2002
    Publication date: April 17, 2003
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Shinichi Ito
  • Publication number: 20030054202
    Abstract: A method of producing a magnetic recording medium comprising the step of forming a magnetic layer on a non-magnetic base film running at a constant speed by continuous oblique evaporation depositing metal vapor of volatilized metal incident obliquely to a surface of the non-magnetic base film, wherein the evaporation is conducted at a film forming rate, defined as an average deposition rate of the magnetic layer at a part of the non-magnetic base film exposed to the incident metal vapor, of not less than a predetermined rate to form an internal microstructure of the magnetic layer comprising columns each having a diameter of not more than about 15 nm constituted by magnetic particles having a size of not more than about 10 nm connected in chains in a direction substantially perpendicular to the magnetic layer and non-magnetic particles packed between the columns and separating the columns from each other, and a magnetic recording medium produced by the above method.
    Type: Application
    Filed: August 14, 2002
    Publication date: March 20, 2003
    Inventors: Yuichi Arisaka, Junichi Tachibana, Takuya Ito, Yoh Iwasaki
  • Publication number: 20030054095
    Abstract: In manufacturing of a magnetic recording medium by using an extrusion-type coating method of extruding a coating liquid from an end of a slit of a coating head and applying the coating liquid to a continuously-running flexible support while making the flexible support relatively approach the end of the coating head so as to apply a magnetic coating liquid obtained by dispersing magnetic particles in a solvent on the flexible support to form a magnetic-coating-liquid layer, the quality of the coating condition is evaluated in accordance with shearing energy E for unit volume of the magnetic-coating-liquid layer obtained by 1 E = µ · L · V 4 · t 2 ,
    Type: Application
    Filed: June 4, 2002
    Publication date: March 20, 2003
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventors: Toshihiro Mandai, Mikio Tomaru, Hideaki Takekuma
  • Publication number: 20030049389
    Abstract: A production method of the present invention is a method of producing a spin valve type giant magnetoresistive thin film. In this production method, a buffer layer, an antiferromagnetic layer, a fixed magnetization layer, a nonmagnetic conductive layer, a free magnetization layer, and a protective layer are consecutively stacked on a substrate. Furter, plasma treatment is performed on predetermined stacked interfaces in the spin valve type giant magnetoresistive thin film to reduce the interlayer coupling magnetic field acting between the fixed magnetization layer and the free magnetization layer and to obtain a high MR ratio. The above production method can achieve both of the high MR ratio and low interlayer coupling magnetic field (Hin) in the thin film produced.
    Type: Application
    Filed: September 10, 2002
    Publication date: March 13, 2003
    Applicant: Anelva Corporation
    Inventors: Koji Tsunekawa, Daisuke Nakajima
  • Patent number: 6531202
    Abstract: The present invention provides perpendicular recording media having a soft magnetic underlayer and magnetic regions which generate an external magnetic field in the soft magnetic underlayer. The soft magnetic underlayer is brought into a substantially single-domain state by the magnetic field, thereby reducing or eliminating unwanted noise in the soft underlayer. In a preferred embodiment, the recording medium includes a ring-shaped soft magnetic underlayer positioned between concentric ring-shaped magnetic regions.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: March 11, 2003
    Assignee: Seagate Technology LLC
    Inventors: Dmitri Litvinov, Sakhrat Khizroev, Mark Howard Kryder
  • Patent number: 6528110
    Abstract: A method for modifying a porous mechanical component by using an ER or MR substance including the steps of providing at least one porous component having a porosity sufficient to receive the MR substance within a plurality of pores and impregnating the component with the MR substance.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: March 4, 2003
    Assignee: Visteon Global Technologies, Inc.
    Inventor: Norman Szalony
  • Patent number: 6528166
    Abstract: Nickel composite particles having a layer of a nickel-containing spinel on at least a part of the surface of nickel particles, or nickel composite particles having an oxide layer of metals other than nickel on at least a part of the surface of nickel particles and a layer of a nickel-containing spinel at an interface between the nickel particles and the metal oxide layer. The nickel composite particles are produced by forming fine liquid droplets from a solution containing (a) at least one thermally decomposable nickel compound and (b) at least one thermally decomposable metal compound capable of forming a spinel together with nickel; and heating the liquid droplets at a temperature higher than the decomposition temperatures of the compound (a) and (b) to nickel particles and simultaneously deposit a nickel-containing spinel layer, or further a metal oxide layer on the spinel layer.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: March 4, 2003
    Assignee: Shoei Chemical Inc.
    Inventors: Yuji Akimoto, Kazuro Nagashima, Hiroshi Yoshida, Yiyi Ma
  • Patent number: 6524724
    Abstract: High areal density magnetic recording media exhibiting low noise are formed with a Ni—P—X plating layer, in which X is an additive meeting the following requirement: (1) The additive has a higher oxidation potential than that of Ni so that grains of an additive-rich-oxide will form first during oxidation under a controlled atmosphere and grains of a Ni-rich-oxide, if any, will form subsequently and separately from the grains of the additive-rich oxide. (2) The additive has a tendency to segregate to the top surface. (3) The additive is not a catalyst poison for Ni—P plating in the composition range.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: February 25, 2003
    Assignee: Seagate Technology LLC
    Inventors: Yuanda Randy Cheng, Connie Chunling Liu, Chung Shih, Linda Lijun Zhong, Jeff Duane St. John, Jeffery Lee Petrehn
  • Patent number: 6521341
    Abstract: The invention concerns magnetic and heat-sensitive particles having a predetermined size between 0.05 and 10 &mgr;m, each particle comprising: an inner composite core consisting of a solid organic or inorganic particle, containing within it a magnetic filler; an outer coati based on a polymer capable of interacting with at least a biological molecule, the outer polymer is heat-sensitive and has a predetermined low critical solubility temperature (LCST) ranging between 10 and 100° C. and preferably between 20 and 60° C. The invention also concerns methods for obtaining said particles and their uses. The particles are characterized in that there is an intermediate layer between the inner core and the outer layer isolating said inner core magnetic filler with respect to said functionalized outer layer. Said invention is particularly useful for separating proteins and/or nucleic acids.
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: February 18, 2003
    Assignee: Bio Merieux
    Inventors: Abdelhamid Elaissari, Christian Pichot, Bernard Mandrand
  • Publication number: 20030031783
    Abstract: Adsorbent particles comprising superparamagnetic and/or low Curie Temperature transition metal-containing cores surrounded by a hydrous siliceous oxide coating can be formed by an aqueous process wherein the core is precipitated from an aqueous solution and a siliceous oxide coating is deposited thereon while complete drying of the core is avoided until after the siliceous oxide is deposited. The resulting siliceous adsorbents exhibit strong superparamagnetic and/or low Curie temperature magnetic properties with low transition metal leachability.
    Type: Application
    Filed: September 4, 2002
    Publication date: February 13, 2003
    Applicant: W.R. Grace & Co.-Conn.
    Inventors: James Neil Pryor, Linda Lee Crump
  • Publication number: 20030030027
    Abstract: The present invention includes magnetizable coating composition for application to a substrate. The coating composition includes a plurality of strontium and or barium hexaferrite particles having a random magnetic pole alignment. The coating composition also includes a binder adhesive capable of suspending the strontium hexaferrite particles. The binder adhesive is a latex capable of adhering in a substantially thin film to the substrate. The strontium hexaferrite particles are normally present between 50% to 98% of the coating composition's total weight when dried on the substrate. The thickness of the film of the coating composition is at least about 0.5 mils thick, and has 6 to 24 magnetic pole changes per linear inch. The binder adhesive allows for manipulation of the strontium hexaferrite particles to a non-random magnetic pole alignment after the ferromagnetic particles have dried in the binder adhesive on the substrate.
    Type: Application
    Filed: July 31, 2001
    Publication date: February 13, 2003
    Inventors: R. William Graham, Daniel F. Peters, Charles E. Adams, Ricky L. Helton
  • Patent number: 6517896
    Abstract: A high performance specular free layer bottom spin valve is disclosed. This structure made up the following layers: NiCr/MnPt/CoFe/Ru/CoFe/Cu/free layer/Cu/Ta or TaO/Al2O3. A key feature is that the free layer is made of a very thin CoFe/NiFe composite layer. Experimental data confirming the effectiveness of this structure is provided, together with a method for manufacturing it and, additionally, its longitudinal bias leads.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: February 11, 2003
    Assignee: Headway Technologies, Inc.
    Inventors: Cheng T. Horng, Mao-Min Chen, Min Li, Ru-Ying Tong
  • Patent number: 6517942
    Abstract: A magnetic recording medium includes a magnetic layer, main components of which are magnetic powder and a binder, and a non-magnetic substrate on which the magnetic layer is formed. The binder is a polyurethane resin including a propanediol derivative expressed by the following general formula as an ingredient. The polyurethane resin has a urethane group concentration of 4,000 or more equivalents per 1 t of the resin, and a glass transition temperature of 100° C. or more, preferably, where either or both of R1 and R2 in the general formula is a saturated hydrocarbon group having a carbon number of 2 to 8 and the remnant is a saturated hydrocarbon.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: February 11, 2003
    Assignee: Sony Corporation
    Inventors: Toshitsugu Ono, Tomohiro Sato, Yuji Aoyama
  • Patent number: 6517763
    Abstract: This invention relates to processes for the assembly of three-dimensional structures having periodicities on the scale of optical wavelengths, and at both smaller and larger dimensions, as well as compositions and applications therefore. Invention embodiments involve the self assembly of three-dimensionally periodic arrays of spherical particles, the processing of these arrays so that both infiltration and extraction processes can occur, one or more infiltration steps for these periodic arrays, and, in some instances, extraction steps. The product articles are three-dimensionally periodic on a scale where conventional processing methods cannot be used.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: February 11, 2003
    Assignee: AlliedSignal, Inc.
    Inventors: Anvar Zakhidov, Ray Baughman, Changxing Cui, Ilyas I. Khayrullin, Lo-Min Liu, Igor Udod, Ji Su, Mikhail Kozlov
  • Publication number: 20030026894
    Abstract: A manufacturing method of a magnetic memory device, wherein the inventive method does not require any special technique for forming pattern, but bilaterally ensures precision for processing a tunnel magneto-resistive effect element (called TMR element) and self-matching formation of connecting elements. The manufacturing method of a magnetic memory device comprises a processing step of forming a tunnel magneto-resistive effect film sandwiching a tunnel barrier layer between a magnetic pinned layer and a memory layer into a predetermined elementary configuration by applying a mask layer, wherein the mask layer is formed by applying a plating process.
    Type: Application
    Filed: July 3, 2002
    Publication date: February 6, 2003
    Inventors: Hiroaki Narisawa, Keitaro Endo, Shinya Kubo
  • Patent number: 6514481
    Abstract: The present invention provides novel nanosized particles termed as “nanoclinics” for therapeutic and/or diagnostic use. The particles have a core made of a therapeutic or diagnostic material surrounded by a shell. Further, the particles contain a targeting agent on the surface of the shell for specific recognition of targeted cells. A method is also provided for lysis of cells using DC magnetic field. Further, the present invention also provides a method for fabrication of nanoclinics that can target and lyse specific cells such as cancer cells.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: February 4, 2003
    Assignee: The Research Foundation of State University of New York
    Inventors: Paras N. Prasad, Earl J. Bergey, Charles Liebow, Laurent Levy
  • Patent number: 6514575
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and effect transport and separation of different species of materials. A variety of devices can be made utilizing the composites including a separator, a cell, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities. Some composites can be used to make a dual sensor for distinguishing between two species of materials and a flux switch to regulate the flow of a redox species and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: February 4, 2003
    Assignee: University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe
  • Publication number: 20030021891
    Abstract: A process for producing a magnetic recording medium is provided in which a magnetic layer including a ferromagnetic powder and a binder is provided on a non-magnetic flexible support. In the process, a magnetic liquid containing mainly a ferromagnetic powder and a binder, and an abrasive liquid paste including an abrasive and a binder are prepared separately, and the abrasive liquid paste is subsequently subjected to an ultrasonic dispersion treatment and then mixed with the magnetic liquid to prepare a magnetic coating solution for the magnetic layer.
    Type: Application
    Filed: May 22, 2002
    Publication date: January 30, 2003
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventors: Koji Naoe, Hiroyuki Kobayashi
  • Publication number: 20030012871
    Abstract: A method for modifying a porous mechanical component by using an ER or MR substance including the steps of providing at least one porous component having a porosity sufficient to receive the MR substance within a plurality of pores and impregnating the component with the MR substance.
    Type: Application
    Filed: December 29, 2000
    Publication date: January 16, 2003
    Applicant: Visteon Global Technologies, Inc.
    Inventor: Norman Szalony
  • Patent number: 6506442
    Abstract: A method for producing a magnetic recording medium having a magnetic material coated on a surface of a polymeric film comprising, in the running direction of the polymeric film, the steps of pressing a cleaning tape made of one of a non-woven fabric and a fabric impregnated with a cleaning agent against the surface of said polymeric film onto which said coating material is coated in order to wipe off foreign matter adhering to said surface of the polymeric film; drying the surface of the wiped polymeric film; and just after the drying step, coating a magnetic coating material onto a surface of a polymeric film while said polymeric film is running. An apparatus for the above method is also disclosed.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: January 14, 2003
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Hitoshi Otsuka
  • Publication number: 20030003324
    Abstract: A ferrite layer formation process that may be performed at a lower temperature than conventional ferrite formation processes. The formation process may produce highly anisotropic structures. A ferrite layer is deposited on a substrate while the substrate is exposed to a magnetic field. An intermediate layer may be positioned between the substrate and the ferrite to promote bonding of the ferrite to the substrate. The process may be performed at temperatures less than 300° C. Ferrite film anisotropy may be achieved by embodiments of the invention in the range of about 1000 dyn-cm/cm3 to about 2×106 dyn-cm/cm3.
    Type: Application
    Filed: June 22, 2001
    Publication date: January 2, 2003
    Inventors: Debra Anne Fleming, Gideon S. Grader, David Wilfred Johnson, John Thomson, Robert Bruce Van Dover
  • Patent number: 6500567
    Abstract: In this invention, an ultra thin layer of CoCr alloy nucleation layer is sputtered at an extremely low deposition rate above a predominantly (200) oriented Cr film followed by a CoCrPt based alloy sputtered film at higher rates and moderate temperatures. This structure creates a media which has very high Hc, and excellent PW50, low noise and excellent low TNLD values. By using this technique, the CoCrPt magnetic film achieves excellent in-plane crystallographic orientation, and high Hc is achieved with minimal amount of Pt addition to the magnetic film. The method allows very fine grain structure of cobalt to be formed which contributes to good signal to noise ratio. A fine grain structure combined with chromium segregation between the grains improve the signal to noise ratio even more. A high degree of in-plane c-axis orientation is achieved in the cobalt layer which provides very high hysteresis loop squareness which helps to improve the OW and TNLD.
    Type: Grant
    Filed: October 3, 2000
    Date of Patent: December 31, 2002
    Assignee: Komag, Inc.
    Inventors: Gerardo Bertero, Charles Changqing Chen, Tu Chen, Tsutomu Yamashita, Makoto Imakawa, Michinobu Suekane
  • Patent number: 6500497
    Abstract: A method of producing a patterned magnetic nanostructure is disclosed. The method includes providing a substrate having a non-magnetic single layer or multi layer film that can be converted into a magnetic state by annealing and/or mixing. The method further includes positioning a mask having a desired pattern and resolution associated with the patterned magnetic nanostructure on or over the film. The method additionally includes subjecting the mask-covered substrate to a beam of radiation (focussed or unfocussed) having sufficient energy to locally anneal and/or mix the non-magnetic or weak-magnetic single-layer or multi layer film. Because of the mask effect, only the desired portions of the non-magnetic film are exposed to the beam of radiation. As such, the desired portions of the non-magnetic film are changed from a non-magnetic to a magnetic state to produce an array of magnetic elements in a non-magnetic matrix. The size of each magnetic element is dependent on the resolution of mask.
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: December 31, 2002
    Assignee: Data Storage Institute
    Inventors: Jian-Ping Wang, Tie Jun Zhou, Tow Chong Chong
  • Patent number: 6500351
    Abstract: A recording head pole production process, and a pole made by the process, in which a combination of wet and dry etching steps are utilized to advantageously provide an undercut in the relatively high magnetic moment material beneath a photoresist area used to define the pole such that any re-deposited layer of material which occurs on the sides of the pole and photoresist area during the dry etching operation is advantageously rendered substantially discontinuous, or weakly linked, and the re-deposited material remaining on the pole itself following a photoresist strip can then be removed by being subjected to a stream of gaseous particles and ultimately carried away by the accompanying gas stream itself. In a particular embodiment disclosed herein the relatively high magnetic moment material may comprise a sputter deposited layer of cobalt-zirconium-tantalum (CoZrTa), iron-aluminum-nitride (FeAlN), iron-tantalum-nitride (FeTaN), iron-nitride (FeN) or similar materials.
    Type: Grant
    Filed: May 24, 1999
    Date of Patent: December 31, 2002
    Assignee: Maxtor Corporation
    Inventors: Andrew L. Wu, Jeffrey G. Greiman, Lawrence G. Neumann, Vijay K. Basra
  • Publication number: 20020197395
    Abstract: A method of producing a magnetic recording medium, and an apparatus thereof in which coercive force can be detected in an in-line mode, a metal thin film magnetic layer can be produced stably, and a vapor deposition film having a stable quality can be obtained. A method of producing a magnetic recording medium, comprising the steps of forming a metal thin film magnetic layer on a substrate, irradiating a light to a surface of the metal thin film magnetic layer, and measuring lightness of a reflected light from the surface to monitor coercive force of the metal thin film magnetic layer.
    Type: Application
    Filed: June 10, 2002
    Publication date: December 26, 2002
    Applicant: TDK Corp.
    Inventors: Mitsuru Takai, Shunichi Yamanaka, Hiromichi Kanazawa
  • Publication number: 20020187257
    Abstract: A method of making a thin film nano-material, the method comprising simultaneously depositing atoms of a ferro-magnetic substance together with clusters of a non-magnetic substance onto a surface, thereby providing a thin film nano-material comprising a matrix of the ferro-magnetic substance formed around the clusters of non-magnetic substance.
    Type: Application
    Filed: July 10, 2002
    Publication date: December 12, 2002
    Inventor: Derek Eastham
  • Publication number: 20020182313
    Abstract: A method of manufacturing a permanent magnet by the steps of preparing an admixture of magnetic material and binder material, the admixture material having a particle size of less than 325 mesh. Then heating a carrier gas to a temperature substantially below the melting point of either component of the admixture. The admixture is introduced into the carrier gas and the admixture is sprayed atop a ductile carrier. The admixture adheres to the carrier and forms a solid permanent magnet. An electric field is applied to the sprayed admixture to create a permanent magnetic moment.
    Type: Application
    Filed: July 29, 2002
    Publication date: December 5, 2002
    Applicant: Ford Motor Company
    Inventors: Franco Leonardi, John Matthew Ginder, Robert Corbly McCune
  • Publication number: 20020182312
    Abstract: The method of manufacturing the magnetic medium for data storage comprising magnetic segments (5) for data storage which alternate regularly with nonmagnetic segments, which method comprises deposition on a substrate (1) from a nonmagnetic material a material having low or zero initial magnetization and capable of varying its magnetic characteristics under the effect of irradiation. The mentioned material is laid on the substrate (1) as a layer (2) in a thickness corresponding to one of the overall size values of any one of the magnetic segment (5) being formed. Then the applied layer (2) is selectively irradiated so as to vary the magnetic characteristics of the material of the layer (2) on the irradiated segments before forming the magnetic segments (5) each having a maximum overall size the ratio between which and any other overall size of this magnetic segment is from 3.5:1 to 15:1.
    Type: Application
    Filed: October 10, 2001
    Publication date: December 5, 2002
    Inventors: Boris Aronovich Gurovich, Dmitry Losifovich Dolgy, Evgeny Zalmanovich Meylikhov, Evgeny Pavlovich Velikhov, Vladimir Borisovich Betelin, Evgenia Anatolievna Kuleshova, Evgeny Dmitrievich Olshansky, Boris Aronovich Aronzon, Alexandr Viktorovich Kalinin
  • Publication number: 20020182311
    Abstract: A method of manufacturing electric machines comprised of geometrically patterned arrays of permanent magnets, soft magnetic materials, and electrical conductors deposited by kinetic spraying methods directly atop a carrier. The magnets and planar coils of the present invention may be integrally formed atop carriers to form electrical machines such as motors, generators, alternators, solenoids, and actuators. The manufacturing techniques used in this invention may produce highly defined articles that do not require additional shaping or attaching steps. Very high-purity permanent and soft magnetic materials, and conductors with low oxidation are produced.
    Type: Application
    Filed: May 30, 2001
    Publication date: December 5, 2002
    Inventors: Franco Leonardi, John Matthew Ginder, Robert Corbly McCune
  • Publication number: 20020182314
    Abstract: A method of manufacturing electric machines comprising the steps of kinetically spraying a powdered admixture of magnetic material and ductile binder material on to a substrate and applying a concentrated magnetic field to the sprayed admixture to cause magnetic dipole alignment in the sprayed admixture. The magnets of the present invention may be integrally formed atop carriers to form electrical machines such as motors, generators, alternators, solenoids, and actuators. The manufacturing techniques used in this invention may produce highly defined articles that do not require additional shaping or attaching steps. Very high-purity permanent and soft magnetic materials, and conductors with low oxidation are produced.
    Type: Application
    Filed: July 29, 2002
    Publication date: December 5, 2002
    Applicant: Ford Motor Company
    Inventors: Franco Leonardi, John Matthew Ginder, Robert Corbly McCune