Thin Film Magnetometers Patents (Class 324/249)
  • Patent number: 11375923
    Abstract: Embodiments disclosed herein relate to systems, devices and methods for monitoring dimensional changes in medical devices attached to or implanted in the body, such as wound fillers. Disclosed embodiments may facilitate measuring the degree of wound closure by incorporating conductive elements into the wound filler. In some embodiments, the conductive elements may be conductive filler, a flexible conductive element, or an arrangement of discrete non-flexible conductive elements. The density of conductive material in an area or volume of the wound filler upon wound closure may be detected by a detection device that assesses the local dielectric constant of the wound filler, such as through use of a capacitive plate, or by a detection device that measures the resonant frequency of a conductive element.
    Type: Grant
    Filed: August 17, 2018
    Date of Patent: July 5, 2022
    Assignee: Smith & Nephew PLC
    Inventor: Allan Kenneth Frazer Grugeon Hunt
  • Patent number: 11333722
    Abstract: A GMI bio-magnetic measuring device based on a magnetic-bead concentration and a simulated lesion shape, includes an impedance analyzer, a Helmholtz coil, a metallic fiber, a fluxgate uniaxial magnetometer, a data acquisition card, a computer, a magnetic-bead-concentration adjustable platform and a lesion shape simulation platform. The metallic fiber is fixedly disposed on the magnetic-bead-concentration adjustable platform or the lesion shape simulation platform. Two terminals of the metallic fiber are electrically connected with a connection terminal of the magnetic-bead-concentration adjustable platform or the lesion shape simulation platform, and then are electrically connected with an input end of the impedance analyzer. An output end of the impedance analyzer is electrically connected with the computer. The magnetic-bead-concentration adjustable platform or the lesion shape simulation platform is placed at the interior of the Helmholtz coil.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: May 17, 2022
    Assignee: INNER MONGOLIA UNIVERSITY OF TECHNOLOGY
    Inventors: Jingshun Liu, Rui Liu, Guanyu Cao, Ze Li, Xufeng Wang
  • Patent number: 11262419
    Abstract: A magnetic sensor comprising: an application specific integrated circuit (ASIC); an insulating protective film formed on a surface of the ASIC; a substrate film formed on the insulating protective film; and a magnetic field detection element formed on the substrate film, the magnetic field detection element including two magnetic wires on the substrate film, a detection coil surrounding the two magnetic wires, two electrodes coupled to the two magnetic wires for wire energization, and two electrodes coupled to the coil for coil voltage detection.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: March 1, 2022
    Assignee: ASAHI INTECC CO., LTD.
    Inventors: Yoshinobu Honkura, Shinpei Honkura, Kazue Kudo, Junichi Tanabe, Eiki Kikuchi
  • Patent number: 11209007
    Abstract: A system includes power harvesting circuitry in combination with energy storage and conversion circuitry. The power harvesting circuitry may be configured to respond to energy generated by rotary machinery having at least condition being monitored by at least one component having at least one electronic circuit, and provide harvested power. The energy storage and conversion circuitry may be configured to respond to the harvested power provided from the power harvesting circuitry, and provide stored and converted power to the at least one component for monitoring the least one condition of the rotary machinery.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: December 28, 2021
    Assignee: FLUID HANDLING LLC
    Inventors: Florin Rosca, Indresh Ishwarlal Bhatia, James Jin-hau Gu, Naman Maheshkumar Raval
  • Patent number: 11029371
    Abstract: The present invention provides a triaxial magnetism detecting apparatus having a high mechanical strength and being compact in size by simplifying the arrangement configuration of magnetism detectors for the reduction of the number of components and allowing easy angular adjustment of the magnetism detectors and easy installation of the magnetism detectors on the apparatus body, and a satellite. A triaxial magnetism detecting apparatus has a power supply board, a circuit board, and a magnetism detecting unit, which are fixed on a body, and the circuit board and the magnetism detecting unit are horizontally connected. By using the magnetism detecting unit, the triaxial magnetism detecting apparatus detects magnitudes of magnetic fields in mutually perpendicular X-axis, Y-axis, and Z-axis directions.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: June 8, 2021
    Assignee: Canon Denshi Kabushiki Kaisha
    Inventors: Takahiro Matsuoka, Takumi Sato, Masahiro Kawase
  • Patent number: 10978448
    Abstract: An integrated circuit has a substrate, a circuit, a core structure, a first encapsulation layer, a second encapsulation layer, and an oxide layer. The circuit includes transistors with active regions developed on the substrate and a metal layer formed above the active regions to provide interconnections for the transistors. The core structure is formed above the metal layer. The first encapsulation layer covers the core structure, and it has a first thermal expansion coefficient. The second encapsulation layer covers the first encapsulation layer over the core structure, and it has a second thermal expansion coefficient that is different from the first thermal expansion coefficient. As a part of the stress relief structure, the oxide layer is formed above the second encapsulation layer. The oxide layer includes an oxide thickness sufficient to mitigate a thermal stress between the first and second encapsulation layers.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: April 13, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Mona M. Eissa, Mark R. Kimmich, Sudtida Lavangkul, Sopa Chevacharoenkul, Mark L. Jenson
  • Patent number: 10969076
    Abstract: The invention describes a light converting device comprising: a bonded layer stack comprising a light converter and a diamond layer, wherein the diamond layer is bonded to a bonding surface of the light converter, wherein the light converter is adapted to convert laser light to converted light, wherein a peak emission wavelength of the converted light is in a longer wavelength range than a laser peak emission wavelength of the laser light, wherein a refractive index of the diamond layer is bigger than a refractive index of the light converter, and a light outcoupling structure attached to a first surface of the bonded layer stack, wherein a second surface of the bonded layer stack is a light-entrance surface arranged to receive the laser light, wherein the bonding surface is arranged between the first surface and the second surface of the bonded layer stack, wherein a refractive index of the light outcoupling structure is at least 90% of the refractive index of the light converter, and wherein the light ou
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: April 6, 2021
    Assignee: LUMILEDS LLC
    Inventors: Ulrich Hechtfischer, Steffen Zozgornik
  • Patent number: 10921389
    Abstract: A planar Hall effect (PHE) sensor for measuring at an external magnetic field includes a plurality of elongated magnetic regions. Each magnetic region includes a ferromagnetic material that is magnetized along a longitudinal axis. The magnetic regions cross one another at an overlap region that is characterized by a plurality of easy magnetic axes. At least two pairs of electrical leads are each aligned along one of the easy magnetic axes. A current source may be connected to a first pair of the electrical leads to cause a current to flow through the overlap region along a first easy magnetic axis. A voltage measurement device may be connected to another pair of the electrical leads to measure a PHE voltage that is generated by a component of the external magnetic field that is perpendicular to the easy magnetic axis along which the overlap region is magnetized.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: February 16, 2021
    Assignees: BAR-ILAN UNIVERSITY, B. G. Negev Technologies and Applications Ltd., at Ben-Gurion University
    Inventors: Lior Klein, Mordechai Schultz, Vladislav Mor, Asaf Grosz, Shai Amrusi, Igor Faivinov
  • Patent number: 10850618
    Abstract: A connection module for an electrical energy storage device of a motor vehicle includes a first connection element and a second connection element for connecting to the electrical energy storage device and to a traction network. The connection module includes busbars which connect the first connection element and the second connection element to one another. The connection module further includes a primary current measurement element and a secondary current measurement element, wherein the secondary current measurement element operates contactlessly. A power supply system for a motor vehicle is also provided.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: December 1, 2020
    Assignee: Volkswagen Aktiengesellschaft
    Inventor: Jochen Juhl
  • Patent number: 10794968
    Abstract: A magnetic field sensor that includes a differential bridge in which each path of the bridge includes a first type of magnetic field sensing device and a second type of magnetic field sensing device. The first and second types of magnetic field sensing devices differ in the magnetic moment imbalance present in the synthetic antiferromagnets (SAFs) included in their reference layers such that that different types of devices produce a different response to perpendicular magnetic fields, but the same response to in-plane magnetic fields. Such different magnetic moment imbalances in the SAFs of magnetic field sensing devices included in a bridge allow for accurate sensing of perpendicular magnetic fields in a differential manner that also cancels out interference from in-plane fields. Techniques for producing such magnetic field sensing devices on an integrated circuit are also presented.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: October 6, 2020
    Assignee: Everspin Technologies, Inc.
    Inventor: Jon Slaughter
  • Patent number: 10663537
    Abstract: A magnetic sensor cell including a magnetic tunnel junction including a reference layer having a reference magnetization oriented substantially parallel to the plane of the reference layer, a sense layer having a sense magnetization, and a tunnel barrier layer between the sense and reference layers. The sense layer includes an intrinsic anisotropy substantially perpendicular to the plane of the sense layer such that the sense magnetization is orientable between an initial direction perpendicular to the plane of the sense layer and a direction parallel to the plane of the sense layer; the intrinsic anisotropy having in anisotropy field being above 150 Oe.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: May 26, 2020
    Assignee: CROCUS TECHNOLOGY SA
    Inventors: Jeffrey Childress, Romain Foissac, Kenneth MacKay
  • Patent number: 10642400
    Abstract: Systems and methods which provide a semiconductor with thin metallic film deposition sensor configuration are described. Thin metallic film semiconductor sensors of embodiments may be utilized in determining various impingements upon the sensor surface, such as from objects touching, hovering near, or light sources illuminating a sensor surface. Embodiments of a thin metallic film deposition semiconductor sensor provide a non-resistive, non-capacitive sensor configuration operable for determining position of various objects, including both electrically conductive objects and non-electrically conductive objects. A semiconductor with thin metallic film sensor of embodiments may additionally or alternatively provide a magnetic field sensor configuration operable for determining magnitude and/or direction with respect to a magnetic field.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: May 5, 2020
    Assignee: City University of Hong Kong
    Inventor: Antonio Ruotolo
  • Patent number: 10634740
    Abstract: A magnetic sensor having a yoke that can achieve large magnetic flux density and that can be accurately formed is provided. The magnetic sensor includes magnetic field detection element 21 that detects a magnetic field in first direction X and first yoke 23 that is located near magnetic field detection element 21 and extends in second direction Z that is orthogonal to first direction X. First yoke 23 includes first portion 23a that is located away from magnetic field detection element 21 at least in first direction X and second portion 23b that is located farther away from magnetic field detection element 21 than first portion 23a with respect to second direction Z. The second portion 23b has surface 23f that is opposite to interface 23d with the first portion 23a, surface 23f having a curved shape that protrudes in a direction away from the first portion 23a.
    Type: Grant
    Filed: August 17, 2017
    Date of Patent: April 28, 2020
    Assignee: TDK Corporation
    Inventors: Naoki Ohta, Keisuke Takasugi
  • Patent number: 10627457
    Abstract: A magnetic field detection sensor includes a magneto-impedance element and detects an external magnetic field from an output obtained by applying alternating current to the magneto-impedance element using a magneto-impedance effect. The magneto-impedance element includes a non-magnetic board and a magnetic film formed on a surface of the non-magnetic board, a longitudinal direction of the magnetic film is set as a detection direction of the external magnetic field, and magnetic anisotropy is provided such that a magnetization easy axis of the magnetic film is the same as the detection direction of the external magnetic field. The magnetic field detection sensor further includes a magnetic field generating portion which generates a magnetic field in a thickness direction of the magnetic film.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: April 21, 2020
    Assignee: YAZAKI CORPORATION
    Inventors: Hiroki Sugiyama, Junya Tanigawa, Makoto Ishii, Takahiro Shouda
  • Patent number: 10613163
    Abstract: Micro-imaging may be performed with an ultra-sensitive atomic magnetometer (AM) and an array of flux guides (FGs). The array of FGs may be configured to act as a magnetic lens that expands microscopic magnetic distribution to match dimensions of the AM. A plurality of single channel AMs may be combined into an array, or the AM may include an array of photodetectors, to realize multi-channel operation.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: April 7, 2020
    Assignee: Triad National Security, LLC
    Inventors: Igor Savukov, Young Jin Kim
  • Patent number: 10309801
    Abstract: An arrangement for measuring an angular position of a rotor with respect to a stator, comprises a multi-pole magnet mounted on the rotor, and a sensor mounted on the stator and a plurality of sensor elements organized in two groups or four groups for measuring a magnetic field component. A method for calculating the angular position comprises making a sum of signals of the elements of each group, a ratio of the two sums, and an arctan function. Alternatively the method may comprise making a sum of signals, the difference of sums, a ratio of the differences, and an arctan function. An integrated sensor, and the use of such arrangement or sensor in an automotive environment.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: June 4, 2019
    Assignee: MELEXIS TECHNOLOGIES NV
    Inventors: Christian Schott, Samuel Huber
  • Patent number: 10157633
    Abstract: Methods, devices, and compositions for use with spintronic devices such as magnetic random access memory (MRAM) and spin-logic devices are provided. Methods include manipulating magnetization states in spintronic devices and making a structure using spin transfer torque to induce magnetization reversal. A device described herein manipulates magnetization states in spintronic devices and includes a non-magnetic metal to generate spin current based on the giant spin Hall effect, a ferromagnetic thin film with perpendicular magnetic anisotropy, an oxide thin film, and an integrated magnetic sensor. The device does not require an insertion layer between a non-magnetic metal with giant spin Hall effect and a ferromagnetic thin film to achieve perpendicular magnetic anisotropy.
    Type: Grant
    Filed: April 27, 2017
    Date of Patent: December 18, 2018
    Assignee: Brown University
    Inventors: Gang Xiao, Qiang Hao
  • Patent number: 10048329
    Abstract: A reduced size/thickness magnetic detection device includes: a substrate; and a magneto-impedance element at one substrate surface side and including a magneto-sensitive wire and a detection coil. The wire senses an external magnetic field component in a first axis direction in which the wire extends. The coil loops around the wire, and includes left-side and right-side coil parts coexisting along the wire, and a magnetic field direction changing body of soft magnetic material having at least a part at another substrate surface side or in the substrate above an intermediate position between left-side and right-side coil parts. The body can change an external magnetic field component in a third axis direction intersecting the substrate to a measurement magnetic field component in the first axis direction. The external magnetic field component in the third axis direction can be detected from a left-side coil part output and a right-side coil part output.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: August 14, 2018
    Assignee: AICHI STEEL CORPORATION
    Inventors: Michiharu Yamamoto, Tomohiko Nagao
  • Patent number: 10048298
    Abstract: An electrical power measurement device measures electrical power consumed in a circuit to be measured including a power source, a load, and a pair of electric wires connecting the power source with the load. The device includes a sensor unit including a plurality of the sensor parts including a magnetic element in which element terminals are formed at both ends of a magnetic film, a measurement resistor connected to the magnetic element in series, and a detecting means that detects a voltage change of the magnetic element and outputs a predetermined component; an addition means that adds the outputs of the detecting means of all of the sensor parts; and a fixing means that fixes the magnetic elements of the sensor parts, at equal distance positions from a virtual axis serving as a position reference at which the one electric wire is arranged, in a direction facing the virtual axis.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: August 14, 2018
    Assignee: SIRC CO., LTD
    Inventor: Hiroaki Tsujimoto
  • Patent number: 10001531
    Abstract: The present invention relates to a compound exhibiting Giant Magneto-Impedance (GMI) properties. The general chemical formula of the compound is (FeXCo100-X)100-(?+?+?)Cr?Si?B?, characterized in that ?<? and ?<?, wherein ? is preferably in the range of 2 to 4% by weight, ? is preferably in the range of 11.5% to 13% by weight, and ? is preferably in the range of 11% to 13% by weight, and X is preferably about 6% by weight. The chemical formula more preferably is (Fe6%Co94%)72.5%Cr2% Si12.5%B13%. The present invention also relates to a giant magneto-impedance (GMI) based sensing device for non-destructive contactless detection of carburization in austenitic stainless steel samples in field.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: June 19, 2018
    Assignees: Indian Oil Corporation Limited, COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
    Inventors: Sova Bhattacharya, Qazi Mohammad Amir, Chandrasekaran Kannan, Brijesh Kumar, Biswapriya Das, Ashish Kumar Panda, Rajat Kumar Roy, Tarun Kumar Das, Swapan Kumar Das, Amitava Mitra
  • Patent number: 9917216
    Abstract: Kesterite-based photovoltaic devices formed on flexible ceramic substrates are provided. In one aspect, a method of forming a photovoltaic device includes the steps of: forming a back contact on a flexible ceramic substrate; forming a kesterite absorber layer on a side of the back contact opposite the flexible ceramic substrate; annealing the kesterite absorber layer; forming a buffer layer on a side of the kesterite absorber layer opposite the back contact; and forming a transparent front contact on a side of the buffer layer opposite the kesterite absorber layer. A roll-to-roll-based method of forming a photovoltaic device and a photovoltaic device are also provided.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: March 13, 2018
    Assignee: International Business Machines Corporation
    Inventors: John A. Olenick, Teodor K. Todorov
  • Patent number: 9870858
    Abstract: An integrated fluxgate device, which includes a magnetic core, an excitation coil, and a sense coil. The magnetic core has a longitudinal edge and a terminal edge. The excitation coil coils around the longitudinal edge of the magnetic core, and the excitation coil has a first number of excitation coil members within a proximity of the terminal edge. The sense coil coils around the longitudinal edge of the magnetic core, and the sense coil has a second number of sense coil members within the proximity of the terminal edge. For reducing fluxgate noise, the second number of sense coil members may be less than the first number of excitation coil members within the proximity of the terminal edge.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: January 16, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Dok Won Lee, Sudtida Lavangkul, Erika Lynn Mazotti, William David French
  • Patent number: 9797966
    Abstract: The invention relates to a magnetic field measurement device, including a detector (4) configured to measure the amplitude of an output signal at a harmonic of an oscillation frequency of an excitation source, said amplitude being proportional to the magnetic field (B) to be measured, characterised in that it comprises an excitation circuit configured to associate with a principal excitation source (B1cos?t) oscillating at a principal oscillation frequency at least one secondary excitation source (B2cos(?/3t+?2)) oscillating at a secondary oscillation frequency that is a fraction of the principal oscillation frequency, said fraction being odd if said harmonic is odd, and even if said harmonic is even.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: October 24, 2017
    Assignee: Commissariat à l'énergie atomique et aux énergies alternatives
    Inventors: Matthieu Le Prado, Francois Bertrand, Marie-Constance Corsi, Elisabeth Delevoye, Sophie Morales
  • Patent number: 9784774
    Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to determine an operational status of a device. An example method includes determining, with a processor, a first multi-dimensional measurement of a first magnetic field generated by a power cord to supply power to a device; and determining, via the processor, an operational status of the device based on the first multi-dimensional measurement.
    Type: Grant
    Filed: January 6, 2014
    Date of Patent: October 10, 2017
    Assignee: The Nielsen Company (US), LLC
    Inventors: Bostjan Valencic, Igor Sotosek
  • Patent number: 9739849
    Abstract: A magnetic field detecting device which comprises a magnetic impedance sensor including a magnetic impedance element 1 in which a pulse electrical current or a high frequency electrical current is applied from an oscillator 2 to an amorphous wire 10 and an alternate current or AC damped oscillation voltage, which is induced in a detecting coil 11 wound around the amorphous wire 10 and has a magnitude corresponding to an external magnetic field, is output, and an arbitrary magnetic field is applied to the amorphous wire by means of the magnetic field generated on the detecting coil 11 energized by connecting the detecting coil 11 to a voltage source or to a current source E through an impedance network 3 comprising of a resistor R or a coil L or a condenser C or comprising a combination of the resistor R, the coil L, and the condenser C.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: August 22, 2017
    Assignee: AICHI STEEL CORPORATION
    Inventors: Michiharu Yamamoto, Hideo Arakawa, Takeshi Kawano
  • Patent number: 9664494
    Abstract: A magnetic field sensor with enhanced immunity to external magnetic interference is presented. Included is a magnetic field signal generator and a demodulator. The magnetic field signal generator produces a magnetic field signal having a modulated signal portion in a first frequency band based on a sensed modulated AC bias magnetic field. The modulated AC bias magnetic field is produced by movement of ferromagnetic target relative to a bias coil when an AC signal is applied to the bias coil. When the magnetic field signal also includes an unwanted signal portion in a second frequency band based on external magnetic interference, demodulation performed by the demodulator results in the modulated signal portion being shifted from the first frequency band to a third frequency band and the unwanted signal portion being shifted to the first frequency band. The bias coil may be provided as part of the magnetic field sensor.
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: May 30, 2017
    Assignee: Allegro Microsystems, LLC
    Inventors: Devon Fernandez, Paul David, William P. Taylor
  • Patent number: 9632453
    Abstract: A differential transformer magnetic permeability sensor includes a substrate, a drive coil, a first differential coil, a second differential coil, a first interconnection pattern, and a second interconnection pattern. The first differential coil is disposed at a side of a first surface of the substrate, and an induced voltage is generated therein when the drive coil is driven. The second differential coil is disposed at a side of a second surface of the substrate, and an induced voltage is generated therein when the drive coil is driven. The first interconnection pattern is located on the first surface and allows the first differential coil to serve as a reference coil, and the second differential coil as a sensing coil. The second interconnection pattern is located on the second surface and allows the second differential coil to serve as a reference coil, and the first differential coil as a sensing coil.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: April 25, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Yukihiro Aikawa
  • Patent number: 9500721
    Abstract: A magnetic field detecting device which comprises a magnetic impedance sensor including a magnetic impedance element 1 in which a detecting coil 11 wound around an amorphous wire 10 for detecting and outputting the external magnetic field around the amorphous wire at a rise time and a fall time of the pulse current in case of the pulse current is applied to the amorphous wire and a signal processing device 3 includes two sample-hold circuit 31, 32 for respectively sample-holding the alternate current damped oscillation voltage at the rise time and the fall time of the applied pulse current, wherein the output signal in response to the external magnetic field around the amorphous wire is output based on the detected two alternate current damped oscillation voltages output at the rise time and the fall time of the pulse current.
    Type: Grant
    Filed: February 20, 2015
    Date of Patent: November 22, 2016
    Assignee: AICHI STEEL CORPORATION
    Inventors: Michiharu Yamamoto, Hideo Arakawa, Takeshi Kawano
  • Patent number: 9470765
    Abstract: Method and apparatus for a current sensing device including a magnetoresistive magnetic field sensing element positioned with respect to a shaped conductor such that an applied field generated by current through the shaped conductor forms an offset angle theta defined by the applied field and a field of a pinning layer of the magnetoresistive element. The offset angle increases a linearity of the device output for current in the shaped conductor flowing in a first direction. A further sensor can increase linearity in the opposite direction.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: October 18, 2016
    Assignee: ALLEGRO MICROSYSTEMS, LLC
    Inventor: Alexander Latham
  • Patent number: 9316703
    Abstract: An apparatus for measuring a magnetic field is described, which comprises a core and an exciter coil for remagnetizing the core material. The remagnetizable core material is embodied as a layer or as multiple layers disposed at a distance from one another, and the core has a maximum total extension G where 2.5 mm?G?0.2 mm, a ratio of length to width that is greater than or equal to a value of twenty, and a thickness D where 2 ?m?D?0.2 ?m. Also described is a corresponding method for measuring a magnetic field.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: April 19, 2016
    Assignee: ROBERT BOSCH GMBH
    Inventors: Frank Schatz, Paul Farber, Stefan Weiss, Gerhard Lammel, Fouad Bennini
  • Patent number: 9286962
    Abstract: A magnetic memory system includes a superconductor circuit and one or more magnetic memory elements to store data. To write data, a driver circuit in the superconductor circuit generates a magnetic signal for transmission over a superconductor link extending between the superconductor circuit and the magnetic memory element. To read data, a sensing circuit in the superconductor circuit monitors a superconductor link extending from sensing circuit to the magnetic memory element. The magnetic memory element can be a spin-transfer type magnetic memory element.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: March 15, 2016
    Assignees: Raytheon BBN Technologies Corp., New York University
    Inventors: Thomas Akira Okhi, Andrew Kent
  • Patent number: 9203016
    Abstract: A method is described for manufacturing a magnetic sensor module (100, 200, 300, 400) having magnetic sensor elements (130, 330, 430) monolithically integrated at a semiconductor chip (110) which comprises an integrated circuit.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: December 1, 2015
    Assignee: NXP B.V.
    Inventors: Mark Isler, Frederik Willem Maurits Vanhelmont
  • Patent number: 9146168
    Abstract: Disclosed is a passive, in-situ pressure sensor. The sensor includes a sensing element having a ferromagnetic metal and a tension inducing mechanism coupled to the ferromagnetic metal. The tension inducing mechanism is operable to change a tensile stress upon the ferromagnetic metal based on a change in pressure in the sensing element. Changes in pressure are detected based on changes in the magnetic switching characteristics of the ferromagnetic metal when subjected to an alternating magnetic field caused by the change in the tensile stress. The sensing element is embeddable in a closed system for detecting pressure changes without the need for any penetrations of the system for power or data acquisition by detecting changes in the magnetic switching characteristics of the ferromagnetic metal caused by the tensile stress.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 29, 2015
    Assignee: Consolidated Nuclear Security, LLC
    Inventors: David K. Mee, Edward B. Ripley, Zachary C. Nienstedt, Alex W. Nienstedt, Layton N. Howell, Jr.
  • Patent number: 9054028
    Abstract: A magnetic sensor for detecting the intensity of a magnetic field in three axial directions, in which a plurality of giant magnetoresistive elements are formed on a single semiconductor substrate. A thick film is formed on the semiconductor substrate; giant magnetoresistive elements forming X-axis and Y-axis sensors are formed on a planar surface thereof; and giant magnetoresistive elements forming a Z-axis sensor are formed using slopes of channels in the thick film. Each of the slopes of the channels can be constituted of a first slope and a second slope, so that a magneto-sensitive element is formed on the second slope having a larger inclination angle. In order to optimize the slope shape and inclination with respect to each channel, it is possible to form a dummy slope that does not directly relate to the formation of the giant magnetoresistive elements.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: June 9, 2015
    Assignee: Yamaha Corporation
    Inventors: Hiroshi Naito, Hideki Sato, Yukio Wakui, Masayoshi Omura
  • Patent number: 8988072
    Abstract: A vertical Hall sensor includes a Hall effect region and a plurality of contacts formed in or on a surface of the Hall effect region. The plurality of contacts are arranged in a sequence along a path extending between a first end and a second end of the Hall effect region. The plurality of contacts includes at least four spinning current contacts and at least two supply-only contacts. The spinning current contacts are configured to alternatingly function as supply contacts and sense contacts according to a spinning current scheme. The at least four spinning current contacts are arranged along a central portion of the path. The at least two supply-only contacts are arranged on both sides of the central portion in a distributed manner and are configured to supply electrical energy to the Hall effect region according to an extension of the spinning current scheme.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: March 24, 2015
    Assignee: Infineon Technologies AG
    Inventor: Udo Ausserlechner
  • Patent number: 8963544
    Abstract: A magnetic detection element includes a magnetoresistance effect portion composed of a magnetoresistance effect material and a pair of yoke portions. The pair of yoke portions is composed of a soft magnetic material and are respectively arranged so as to be electrically connected to both sides of the magnetoresistance effect portion. The pair of yoke portions guides magnetic flux into the magnetoresistance effect portion. The magnetic detection element also includes a bypass portion, which is composed of a soft magnetic material and is saturated with magnetic flux at lower magnetic field intensity than the yoke portions, and which guides a part of the magnetic flux generated in the yoke portions so as to divert the magnetic flux from the magnetoresistance effect portion.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: February 24, 2015
    Assignee: The Research Institute for Electric and Magnetic Materials
    Inventors: Hirofumi Imatani, Masaaki Yamamoto, Mamiko Naka, Yasushi Kaneta, Kiwamu Shirakawa
  • Publication number: 20150048819
    Abstract: A magnetic sensor device includes a thin film first magnetic body provided with a magnetic path convergence/divergence section arranged on a predetermined axis, and at least a pair of wing-shaped sections extending from the magnetic path convergence/divergence section toward the opposite sides of said axis, a thin film second magnetic body provided with a magnetic path convergence/divergence section arranged on the predetermined axis to be spaced from the magnetic path convergence/divergence section of the first magnetic body, at least a pair of wing-shaped sections extending from this magnetic path convergence divergence toward the opposite sides of the axis, a first coil wound around the first magnetic body, a second coil wound around the second magnetic body, and a magnetoresistance effect element arranged between the magnetic path convergence/divergence section of the first magnetic body and the of the second magnetic body.
    Type: Application
    Filed: March 13, 2013
    Publication date: February 19, 2015
    Applicant: HITACHI METALS, LTD.
    Inventors: Makoto Kawakami, Yasunori Takaki, Yasunori Abe, Yasuhito Takeuchi
  • Patent number: 8952689
    Abstract: A magnetism sensor comprises a magnetoresistive element, the resistance of which changes due to the application of an induced magnetic field from the current being measured, and a fixed-resistance element. The fixed-resistance element has a self-pinned ferromagnetic fixed layer comprising a first ferromagnetic film and a second ferromagnetic film coupled antiferromagnetically with an antiparallel coupling film interposed therebetween. The antiparallel coupling film is a ruthenium film that exhibits an antiferromagnetic coupling effect with a first peak thickness. The difference between the degrees of magnetization of the first ferromagnetic film and the second ferromagnetic film is effectively zero.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: February 10, 2015
    Assignee: Alps Electric Co., Ltd.
    Inventors: Yosuke Ide, Masamichi Saito
  • Patent number: 8947082
    Abstract: An integrated dual-axis anisotropic magnetoresistive sensor can include first and second sensor units. A resistor bridge of the first sensor unit can include a plurality of magnetoresistors, each having at least one strip of anisotropic magnetoresistive material with a longitudinal axis substantially parallel to the technological anisotropy axis of the material. A resistor bridge of the second sensor unit can include a plurality of magnetoresistors having a plurality of strips of the anisotropic magnetoresistive material, the plurality of strips including a first subset having longitudinal axes aligned at a first angle to the technological anisotropy axis and a second subset having longitudinal axes aligned at a second angle to the technological anisotropy axis. The second angle can have the same magnitude as the first, but be rotated in an opposite direction from the technological anisotropy axis.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: February 3, 2015
    Assignee: University College Cork, National University of Ireland
    Inventor: Jan Kubik
  • Patent number: 8933696
    Abstract: A magnetic sensor includes a plurality of assemblies combined. Each assembly includes a plurality of tunnel magnetoresistive elements, a capacitor and a fixed resistor. The tunnel magnetoresistive dements are (i) disposed in such a way that fixed magnetization directions of fixed magnetic layers are substantially identical and changeable magnetization directions of free magnetic layers with no magnetic field applied are substantially identical and (ii) connected to each other in series-parallel. The capacitor is connected in parallel to the tunnel magnetoresistive elements. The fixed resistor is connected in series to the tunnel magnetoresistive elements and to the capacitor. The assemblies are (i) disposed in such a way that the fixed magnetization directions of the fixed magnetic layers of the assemblies have a relative angle of more than 90 degrees and (ii) connected to each other in series and/or in parallel.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: January 13, 2015
    Assignee: Konica Minolta, Inc.
    Inventor: Takuo Nishikawa
  • Patent number: 8922205
    Abstract: A magnitude and direction of at least one of a reset current and a second stabilization current (that produces a reset field and a second stabilization field, respectively) is determined that, when applied to an array of magnetic sense elements, minimizes the total required stabilization field and reset field during the operation of the magnetic sensor and the measurement of the external field. Therefore, the low field sensor operates optimally (with the highest sensitivity and the lowest power consumption) around the fixed external field operating point. The fixed external field is created by other components in the sensor device housing (such as speaker magnets) which have a high but static field with respect to the low (earth's) magnetic field that describes orientation information.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: December 30, 2014
    Assignee: Everspin Technologies, Inc.
    Inventors: Lianjun Liu, Philip Mather, Jon Slaughter
  • Patent number: 8907666
    Abstract: A scissor style magnetic sensor having a novel hard bias structure for improved magnetic biasing robustness. The sensor includes a sensor stack that includes first and second magnetic layers separated by a non-magnetic layer such as an electrically insulating barrier layer or an electrically conductive spacer layer. The first and second magnetic layers have magnetizations that are antiparallel coupled, but that are canted in a direction that is neither parallel with nor perpendicular to the air bearing surface by a magnetic bias structure. The magnetic bias structure includes a neck portion extending from the back edge of the sensor stack and having first and second sides that are aligned with first and second sides of the sensor stack. The bias structure also includes a tapered or wedged portion extending backward from the neck portion.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: December 9, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Quang Le, Simon H. Liao, Shuxia Wang, Guangli Liu, Yongchul Ahn
  • Patent number: 8901924
    Abstract: A semiconductor process and apparatus provide a high-performance magnetic field sensor with three differential sensor configurations which require only two distinct pinning axes, where each differential sensor is formed from a Wheatstone bridge structure with four unshielded magnetic tunnel junction sensor arrays, each of which includes a magnetic field pulse generator for selectively applying a field pulse to stabilize or restore the easy axis magnetization of the sense layers to orient the magnetization in the correct configuration prior to measurements of small magnetic fields. The field pulse is sequentially applied to groups of the sense layers of the Wheatstone bridge structures, thereby allowing for a higher current pulse or larger sensor array size for maximal signal to noise ratio.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: December 2, 2014
    Assignee: EverSpin Technologies, Inc.
    Inventors: Bradley Engel, Phillip Mather
  • Patent number: 8884616
    Abstract: Embodiments relate to xMR sensors, in particular AMR and/or TMR angle sensors with an angle range of 360 degrees. In embodiments, AMR angle sensors with a range of 360 degrees combine conventional, highly accurate AMR angle structures with structures in which an AMR layer is continuously magnetically biased by an exchange bias coupling effect. The equivalent bias field is lower than the external rotating magnetic field and is applied continuously to separate sensor structures. Thus, in contrast with conventional solutions, no temporary, auxiliary magnetic field need be generated, and embodiments are suitable for magnetic fields up to about 100 mT or more. Additional embodiments relate to combined TMR and AMR structures. In such embodiments, a TMR stack with a free layer functioning as an AMR structure is used. With a single such stack, contacted in different modes, a high-precision angle sensor with 360 degrees of uniqueness can be realized.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: November 11, 2014
    Assignee: Infineon Technologies AG
    Inventors: Juergen Zimmer, Klemens Pruegl
  • Patent number: 8872507
    Abstract: The present application discloses an integrated circuit comprising a circuit portion (100) coupled between first and second power supply lines (110; 120); a first switch (115, 135) coupled between the first power supply line (110, 120) and the circuit portion (100) for disconnecting the circuit portion from the first power supply line during an inactive mode of the circuit portion; and an arrangement (315, 335, 410) for, during said inactive mode, providing the circuit portion (100) with a fraction of its active mode power supply at least when averaged over said inactive mode to prevent the circuit portion voltage to drop below a threshold value. The present application further discloses a method for controlling such an integrated circuit.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: October 28, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Rogier Adrianus Henrica Niessen, Willem Franke Pasveer
  • Patent number: 8872514
    Abstract: A magnetic sensor comprises a first ferromagnetic body, a second ferromagnetic body, a channel extending from the first ferromagnetic body to the second ferromagnetic body, a magnetic shield covering the channel, and an insulating film disposed between the channel and the magnetic shield, while the magnetic shield has a through-hole extending toward the channel.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: October 28, 2014
    Assignee: TDK Corporation
    Inventors: Tomoyuki Sasaki, Tohru Oikawa, Kiyoshi Noguchi
  • Patent number: 8847589
    Abstract: A magnetic field sensor including a body including a magnetic mechanism capable of forming a torque applied on the body by action of an external magnetic field to be detected; a connector, separated from the body, mechanically connecting the body to an inlay portion of the sensor by at least one pivot link having an axis perpendicular to the direction of the magnetic field to be detected; a detector detecting stress applied by the body by action of the torque, separated from the connector and including at least one suspended stress gauge including a first part mechanically connected to the inlay portion, a second part mechanically connected to the body, and a third part provided between the first and second parts and suspended between the inlay portion and the body.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: September 30, 2014
    Assignee: Commissariat à l'énergie atomique et aux énergies alternatives
    Inventors: Arnaud Walther, Philippe Robert, Olivier Redon
  • Patent number: 8829900
    Abstract: One embodiment of the present invention relates to a method and apparatus for removing the effect of contact resistances for Hall effect device contacts. In one embodiment, the apparatus comprises a Hall effect device comprising a plurality of force and sense contact pairs. The force and sense contact pairs comprise a force contact and a separate and distinct sense contact. The force contact is configured to act as a supply terminal that receive an input signal while the sense contact is configured act as an output terminal to provide an output signal indicative of a measured magnetic field value. By utilizing separate contacts for inputting a signal (e.g., an applied current) and reading out a signal (e.g., an induced voltage) the non-linearities generated by contact resistances may be removed, thereby minimizing the zero point offset voltage of the measured magnetic field.
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: September 9, 2014
    Assignee: Infineon Technologies AG
    Inventor: Udo Ausserlechner
  • Patent number: 8829901
    Abstract: A method to measure a magnetic field is provided. The method includes applying an alternating drive current to a drive strap overlaying a magnetoresistive sensor to shift an operating point of the magnetoresistive sensor to a low noise region. An alternating magnetic drive field is generated in the magnetoresistive sensor by the alternating drive current. When the magnetic field to be measured is superimposed on the alternating magnetic drive field in the magnetoresistive sensor, the method further comprises extracting a second harmonic component of an output of the magnetoresistive sensor. The magnetic field to be measured is proportional to a signed amplitude of the extracted second harmonic component.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: September 9, 2014
    Assignee: Honeywell International Inc.
    Inventor: Bharat B. Pant
  • Patent number: 8823360
    Abstract: A semiconductor device comprises: a semiconductor element including an electrode; a leading line electrically connected to the electrode, passing above the electrode, and led to a side thereof; and a current sensor sensing current flowing through the leading line. The current sensor includes a magneto-resistance element placed above the electrode and below the leading line. A resistance value of the magneto-resistance element varies linearly according to magnetic field generated by the current.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: September 2, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hajime Akiyama, Akira Okada