Patents Examined by Kevin M. Bernatz
  • Composite magnetic body
    Patent number: 11424059
    Abstract: The present invention provides a composite magnetic body comprising metal particles containing Fe or Fe and Co as a main component, a resin, and voids, wherein an average major axis diameter of the metal particles is 30 to 500 nm, an average aspect ratio of the metal particles is 1.5 to 10, and in a cross section of the composite magnetic body, a percent presence of the voids is 0.2 to 10 area % and an average equivalent circle diameter of the voids is 1 ?m or less, and a saturation magnetization of the composite magnetic body is 300 to 600 emu/cm3.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: August 23, 2022
    Assignee: TDK Corporation
    Inventors: Kyohei Takahashi, Isao Kanada
  • Stacked structure, magnetoresistive effect element, magnetic head, sensor, high frequency filter, and oscillator
    Patent number: 11422211
    Abstract: A stacked structure is positioned on a nonmagnetic metal layer. The stacked structure includes a ferromagnetic layer and an intermediate layer interposed between the nonmagnetic metal layer and the ferromagnetic layer. The intermediate layer includes a NiAlX alloy layer represented by Formula (1): Ni?1Al?2X?3 . . . (1), [X indicates one or more elements selected from the group consisting of Si, Sc, Ti, Cr, Mn, Fe, Co, Cu, Zr, Nb, and Ta, and satisfies an expression of 0<?<0.5 in a case of ?=?3/(?1+?2+?3)].
    Type: Grant
    Filed: January 14, 2021
    Date of Patent: August 23, 2022
    Assignee: TDK CORPORATION
    Inventors: Kazuumi Inubushi, Katsuyuki Nakada
  • Magnetic recording medium having characterized magnetic layer and magnetic recording and reproducing device
    Patent number: 11423933
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which one or more kinds of component selected from the group consisting of a fatty acid and a fatty acid amide are included in a portion of the magnetic layer side on the non-magnetic support, and a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees, after pressing the magnetic layer at a pressure of 70 atm is 45 atom % or more.
    Type: Grant
    Filed: September 16, 2020
    Date of Patent: August 23, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Megumi Nakano, Eiki Ozawa, Norihito Kasada
  • Magnetic recording medium having characterized magnetic layer and magnetic recording and reproducing device
    Patent number: 11417359
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which an isoelectric point of a surface zeta potential of the magnetic layer after pressing the magnetic layer at a pressure of 70 atm is equal to or greater than 5.5.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: August 16, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada
  • Magnetoresistance effect element and Heusler alloy
    Patent number: 11410689
    Abstract: A magnetoresistance effect element includes a first ferromagnetic layer, a second ferromagnetic layer, and a non-magnetic layer positioned between the first ferromagnetic layer and the second ferromagnetic layer, and at least one of the first ferromagnetic layer and the second ferromagnetic layer is a Heusler alloy represented by the following General Formula (1): Co2Fe?X???(1) (in Formula (1), X represents one or more elements selected from the group consisting of Mn, Cr, Si, Al, Ga and Ge, and ? and ? represent numbers that satisfy 2.3??+?, ?<?, and 0.5<?<1.9).
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: August 9, 2022
    Assignee: TDK CORPORATION
    Inventors: Kazuumi Inubushi, Katsuyuki Nakada, Tetsuya Uemura
  • Magnetic shielding unit for wireless power transmission and wireless power transmission module including same
    Patent number: 11412644
    Abstract: Disclosed is a magnetic field shielding unit for wireless power transmission. The magnetic field shielding unit for wireless power transmission includes a magnetic shielding layer formed of ferrite fragments containing magnesium oxide (MgO) shredded to improve flexibility of the magnetic field shielding unit. The ferrite containing magnesium oxide has a real part (??) of the complex permeability of 650 or more at a frequency of 100 kHz. Accordingly, it is possible to prevent influence of a magnetic field on components of a mobile terminal device or a body of a user who uses the same, and to further increase the characteristics of the combined antennas even if the magnetic field shielding unit is combined with various kinds and purposes of antennas having various structures, shapes, sizes and intrinsic characteristics (inductance, resistivity, etc.).
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: August 9, 2022
    Assignee: Amotech Co., Ltd.
    Inventors: Woong Yong Lee, Kil Jae Jang, Seong Tae Kim, Su Jung Kim
  • Hexagonal ferrite magnetic powder
    Patent number: 11404190
    Abstract: Provided is a hexagonal ferrite magnetic powder for a magnetic recording medium, containing hexagonal ferrite magnetic particles having aluminum hydroxide adhered on the surface thereof, the hexagonal ferrite magnetic powder having an Al/Fe molar ratio of 0.030 to 0.200, a Co/Fe molar ratio of 0.002 to 0.030, and a Nb/Fe molar ratio of 0.005 to 0.050, and having an Fe site valence AFe of 3.015 to 3.040 as calculated by AFe=(3+2×[Co/Fe]+5×[Nb/Fe])/(1+[Co/Fe]+[Nb/Fe]) wherein [Co/Fe] represents the Co/Fe molar ratio and [Nb/Fe] represents the Nb/Fe molar ratio, and preferably having an activation volume Vact of 1400 to 1800 nm3. This magnetic powder simultaneously achieves an increase in magnetic characteristics including SNR of a magnetic recording medium and a further increase in durability thereof.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: August 2, 2022
    Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., FUJIFILM CORPORATION
    Inventors: Hirohisa Omoto, Shuji Kaneda, Hiroyuki Suzuki, Toshio Tada
  • Magnetic material and magnetic element
    Patent number: 11393618
    Abstract: A magnetic material is constituted of a ferromagnetic or ferrimagnetic insulator in a double perovskite structure of Sr3-xAxOs1-yByO6 (0.5?x?0.5, ?0.5?y?0.5). A is an alkali metal or alkaline earth metal atom, and B is a transition metal atom, alkali metal atom, or alkaline earth metal atom). The insulator may be Sr3OsO6, where x=y=0 in the above formula. Sr3OsO6 is formed to have a cubic crystal structure where strontium atoms, osmium atoms, and oxygen atoms are arranged at lattice points.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: July 19, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yuki Wakabayashi, Yoshiharu Krockenberger, Hideki Yamamoto, Yoshitaka Taniyasu
  • Magnetic recording medium having non-magnetic layer and characterized vertical squareness ratio, and magnetic recording and reproducing device
    Patent number: 11393502
    Abstract: The magnetic recording medium includes: a non-magnetic support; and a non-magnetic layer including a non-magnetic powder and a magnetic layer including a ferromagnetic powder on the non-magnetic support in this order, in which a vertical squareness ratio is 0.70 to 1.00, a center line average roughness Ra measured regarding a surface of the magnetic layer with an atomic force microscope is equal to or smaller than 2.5 nm, and an interface variation rate between the magnetic layer and the non-magnetic layer in a cross section image obtained by imaging with a scanning electron microscope is equal to or less than 2.5%.
    Type: Grant
    Filed: March 5, 2020
    Date of Patent: July 19, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Masahiko Mori
  • Magnetic recording media design with reduced lattice mismatch between adjacent intermediate layers
    Patent number: 11380358
    Abstract: Magnetic recording media including an interlayer configured to reduce lattice mismatch with adjacent layers of the media, such as an adjacent seed layer or an adjacent underlayer. In one example, an interlayer alloy is provided that includes tungsten (W) along with Cobalt (Co), Chromium (Cr), and Ruthenium (Ru). The atomic percentages of W and Ru within the interlayer are selected so that the amount lattice mismatch between the interlayer and its adjacent layers is below a preselected amount, such as below 3% as quantified by d-spacing. In some examples, the atomic percentage of Ru is greater than 25% and the atomic percentage of W is 2-10%. Methods of fabricating the magnetic recording media are also provided.
    Type: Grant
    Filed: June 25, 2020
    Date of Patent: July 5, 2022
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventor: Kai Tang
  • Method of fabricating a shape-changeable magnetic member, method of producing a shape changeable magnetic member and shape changeable magnetic member
    Patent number: 11373791
    Abstract: A method of fabricating a shape-changeable magnetic member comprising a plurality of segments with each segment being able to be magnetized with a desired magnitude and orientation of magnetization, to a method of producing a shape changeable magnetic member composed of a plurality of segments and to a shape changeable magnetic member.
    Type: Grant
    Filed: April 10, 2020
    Date of Patent: June 28, 2022
    Inventors: Guo Zhan Lum, Zhou Ye, Metin Sitti
  • Magnetic tape having characterized magnetic layer and magnetic recording and reproducing device
    Patent number: 11373680
    Abstract: Provided are a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, in which the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is 0.04 ?m to 0.08 ?m, and an absolute value ?N of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40, and a magnetic recording and reproducing device including the magnetic tape.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: June 28, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Takahiro Iwamoto, Hidemasa Hosoda, Norihito Kasada, Takuto Kurokawa
  • Stress sensor
    Patent number: 11366028
    Abstract: A stress sensor includes a stress detection layer including a laminated body including a first magnetic layer, a first non-magnetic layer, and a second magnetic layer that are laminated, wherein the first magnetic layer and the second magnetic layer have mutually different magnetoelastic coupling constants, such that a stress is detected by an electrical resistance dependent on a relative angle of magnetization between the first magnetic layer and the second magnetic layer varying depending on the stress externally applied.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: June 21, 2022
    Assignees: MURATA MANUFACTURING CO., LTD., THE UNIVERSITY OF TOKYO
    Inventors: Daichi Chiba, Akira Ando
  • Large moments in BCC FECOMNand other alloy thin films
    Patent number: 11367551
    Abstract: Large magnetic moment compositions are formed by stabilizing ternary or other alloys with a epitaxial control layer. Compositions that are unstable in bulk specimen are thus stabilized and exhibit magnetic moments that are greater that a Slater-Pauling limit. In one example, FexCoyMnz layers are produced on an MgO(001) substrate with an MgO surface serving to control the structure of the FexCoyMnz layers. Magnetizations greater than 3 Bohr magnetons are produced.
    Type: Grant
    Filed: December 14, 2018
    Date of Patent: June 21, 2022
    Assignees: Montana State University, The Regents of The University of California
    Inventors: Ryan J. Snow, Yves U. Idzerda, Elke Arenholz
  • Magnetic recording medium having characterized magnetic layer, and magnetic recording and reproducing apparatus
    Patent number: 11367461
    Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a difference Safter?Sbefore between a spacing Safter measured on a surface of the magnetic layer by optical interferometry after methyl-ethyl-ketone cleaning and a spacing Sbefore measured on the surface of the magnetic layer by optical interferometry before methyl-ethyl-ketone cleaning is more than 0 nm and 15.0 nm or less, and the non-magnetic support is an aromatic polyamide support having a moisture absorption of 2.2% or less.
    Type: Grant
    Filed: April 24, 2020
    Date of Patent: June 21, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Magnetic tape having characterized magnetic layer and magnetic recording and reproducing device
    Patent number: 11361792
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and an absolute value ?N of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: June 14, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Magnetic tape having characterized magnetic layer and magnetic recording and reproducing device
    Patent number: 11361793
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an absolute value ?N of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: June 14, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Magnetic tape having characterized back coating layer, magnetic tape cartridge, and magnetic recording and reproducing apparatus
    Patent number: 11355147
    Abstract: The magnetic tape includes: a non-magnetic support; a magnetic layer that includes ferromagnetic powder on one surface side of the non-magnetic support; and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal strontium ferrite powder and ?-iron oxide powder, and the number of protrusions having a height of 50 nm or more and less than 75 nm on a surface of the back coating layer is 700 pieces/6400 ?m2 or less.
    Type: Grant
    Filed: March 20, 2020
    Date of Patent: June 7, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Yoshihiro Sawayashiki, Norihito Kasada
  • Aluminum alloy sheet for magnetic disk and production method therefor, and magnetic disk using said aluminum alloy sheet for magnetic disk
    Patent number: 11341995
    Abstract: An aluminum alloy sheet for a magnetic disk, a method for manufacturing same, and a magnetic disk using same. The aluminum alloy sheet is made of an aluminum alloy comprising 0.10 to 3.00 mass % of Fe, 0.003 to 1.000 mass % of Cu, and 0.005 to 1.000 mass % of Zn, with a balance of Al and unavoidable impurities, wherein a value obtained by dividing a difference in an area ratio (%) of second phase particles between a region (A) and a region (B) by an average value of area ratios (%) of second phase particles in the regions (A) and (B) is 0.05 or less, the region (A) being a region from a sheet thickness center plane to a front surface of the sheet, and the region (B) being a region from the sheet thickness center plane to a rear surface of the plate.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: May 24, 2022
    Assignees: UACJ CORPORATION, FURUKAWA ELECTRIC CO.. LTD.
    Inventors: Kotaro Kitawaki, Yu Igarashi, Keisuke Kamiya, Yu Matsui, Makoto Yonemitsu, Ryo Sakamoto, Hideyuki Hatakeyama, Hiroki Ota
  • Magnetic field shielding sheet for a wireless charger, method for manufacturing same, and receiving apparatus for a wireless charger using the sheet
    Patent number: 11337345
    Abstract: Provided are a magnetic field shield sheet for a wireless charger, a method of manufacturing the sheet, and a receiver for the wireless charger by using the sheet. The sheet includes at least one layer thin magnetic sheet made of an amorphous ribbon separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin magnetic sheet via a first adhesive layer provided on one side of the protective film; and a double-sided tape that is adhered on the other surface of the thin magnetic sheet via a second adhesive layer provided on one side of the double-sided adhesive tape, wherein gaps among the plurality of fine pieces are filled by some parts of the first and second adhesive layers, to thereby isolate the plurality of fine pieces.
    Type: Grant
    Filed: February 25, 2021
    Date of Patent: May 17, 2022
    Assignee: VIRGINIA WIRELESS AND STREAMING TECHNOLOGIES LLC
    Inventors: Dong Hoon Lee, Kil Jae Jang