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公开(公告)号：US20180149715A1
公开(公告)日：2018-05-31
申请号：US15578508
申请日：2016-06-01
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza Deak , Zhimin Zhou
CPC classification number: G01R33/093 , G01R33/0005 , G01R33/0011 , G01R33/09
Abstract: A push-pull X-axis magnetoresistive sensor, comprising: a substrate upon which an interlocked array of soft ferromagnetic flux concentrators and a push-pull magnetoresistive sensor bridge unit are placed. It further may comprise calibration coils and/or initialization coils. At least one of each of the soft ferromagnetic flux concentrators is present such that an interlocking structure may be formed such that there are alternately interlocked and non-interlocked gaps along the X direction. Push/pull magnetoresistive sensing unit strings are respectively located in the interlocked and non-interlocked gaps and are electrically connected to form a push-pull magnetoresistive bridge sensing unit. This magnetoresistive sensing unit is sensitive to magnetic field along the X direction. The calibration coils and initialization coils are respectively compromised of straight calibration conductors and straight initialization conductors that run parallel and perpendicular to the push-pull magnetoresistive sensing unit strings. The structure of this push-pull X-axis magnetoresistive sensor is simple to implement. It has the advantages of high magnetic field sensitivity comparing to a referenced bridge X-axis magnetoresistive sensor as well as low power consumption.
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52.发明申请公开(公告)号：US20180081000A1
公开(公告)日：2018-03-22
申请号：US15542324
申请日：2016-01-05
Applicant: MultiDimension Technology Co. Ltd.
Inventor： James Geza Deak , Zhimin Zhou
CPC classification number: G01R33/0017 , G01R33/0005 , G01R33/0011 , G01R33/0206 , G01R33/09 , G01R33/093 , G01R33/098
Abstract: A single chip Z-axis linear magnetoresistive sensor with a calibration/initialization coil comprises a single chip Z-axis linear magnetoresistive sensor, and a calibration coil and/or an initialization coil. The calibration coil and the initialization coil are planar coils or three-dimensional coils. The planar coils are located above a substrate and below a magnetoresistive sensing unit, between a magnetoresistive sensing unit and a soft ferromagnetic flux concentrator, above a soft ferromagnetic flux concentrator, or in a gap of the soft ferromagnetic flux concentrator. The three-dimensional coil is wound around the soft ferromagnetic flux concentrator and the magnetoresistive sensing unit. The calibration coil and the initialization coil respectively comprise straight wires which are parallel to a magnetization direction of a pinned layer/free layer, wherein the calibration coil generates an equivalent calibration magnetic field parallel/anti-parallel to the direction of the pinned layer of a push or a pull magnetoresistive unit string, and the initialization coil generates a uniform initializing magnetic field in the direction of the free layer at all magnetoresistive sensing units. By controlling the current in the calibration coil/initialization coil, calibration and magnetic state initialization of the single chip Z-axis linear magnetoresistive sensor can be achieved. The sensor has advantages of being highly efficient, quick, and convenient.
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公开(公告)号：US09903920B2
公开(公告)日：2018-02-27
申请号：US14888429
申请日：2014-04-23
Applicant: SENSITEC GMBH
Inventor： Hubert Grimm , Viktor Spetter
CPC classification number: G01R33/096 , G01R33/0011
Abstract: A magnetic field sensor apparatus is provided for measuring one magnetic field vector component He. The apparatus includes at least one anisotropic magneto-resistive resistor device (AMR resistor device) on a chip substrate, where the resistor device includes a plurality of magneto-resistive AMR resistor elements which are connected in series by electrically conductive strips. At least one permanent-magnetic magnetization element with a magnetization axis is assigned to each resistor element in such a way that the resistor element is passed through by an initial magnetization field H0 of the magnetization element in the direction of the magnetization axis. A measurement current IS flowing through the resistor element from a contact region between a first conductive strip and the resistor element to a contact region between the resistor element and a second conductive strip has a mean current direction axis at a predefined linearization angle α>0° and α
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公开(公告)号：US09891292B2
公开(公告)日：2018-02-13
申请号：US15304770
申请日：2015-04-14
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza Deak
CPC classification number: G01R33/0206 , G01R33/0011 , G01R33/0052 , G01R33/04 , G01R33/09 , H01L28/20
Abstract: A monolithic three-axis linear magnetic sensor and manufacturing method wherein the sensor comprises an X-axis sensor, a Y-axis sensor and a Z-axis sensor. The X-axis sensor comprises a referenced bridge and at least two X ferromagnetic flux guides. The Y-axis sensor comprises a push-pull bridge and at least two Y ferromagnetic flux guides. The Z-axis sensor comprises a push-pull bridge and at least one Z ferromagnetic flux guide. The bridge arms of the referenced bridge and push-pull bridge are each formed by one or more magnetoresistive elements that are electrically interconnected. The directions of the sensing axes and the directions of magnetization of the pinned layers of the magnetoresistive elements are all oriented along the X-axis. This manufacturing method comprises first depositing a magnetoresistive thin film on a wafer, and then performing several processes such as magnetic annealing, photolithography, etching, coating, and the like in order to realize a sensor. This monolithic three-axis linear magnetic sensor has the advantages of low cost, easy manufacturability, good linearity, and high sensitivity.
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55.发明授权公开(公告)号：US09857435B2
公开(公告)日：2018-01-02
申请号：US14710102
申请日：2015-05-12
Applicant: FREESCALE SEMICONDUCTOR, INC.
Inventor： Paige M. Holm , Lianjun Liu
CPC classification number: G01R33/0023 , G01R33/0011 , G01R33/0017 , G01R33/0035 , G01R33/09
Abstract: A sensor package includes a magnetic field sensor and a corruption detection and reset subsystem. The magnetic field sensor has a magnetic sense element and a ferromagnetic structure characterized by a baseline magnetic state. The subsystem includes a detector element, a processor, and current carrying structure positioned in proximity to the ferromagnetic structure. Methodology performed by the subsystem entails detecting at the detector element an altered magnetic state of the ferromagnetic structure, where the altered magnetic state differs from the baseline magnetic state. Methodology further entails determining, at the processor, when a reset action is needed in response to the altered magnetic state and applying a reset magnetic field to the ferromagnetic structure to reset the ferromagnetic structure from the altered magnetic state to the baseline magnetic state.
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Patent Agency Ranking
公开(公告)号：US09835696B2
公开(公告)日：2017-12-05
申请号：US14885203
申请日：2015-10-16
Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES , Centre National de la Recherche Scientifique (CNRS)
Inventor： Bernard Dieny , Hélène Joisten , Philippe Sabon
CPC classification number: G01R33/09 , G01R33/0011 , G01R33/0052 , G01R33/02 , G01R35/005
Abstract: A magnetic field sensor includes first and second sensors for detecting first and second magnetic components according to first and second directions. Each sensor includes a flux concentrator including first and second magnetic parts, an air gap between the parts, and a magnetoresistive element in the air gap. Each magnetoresistive element includes a reference layer having a fixed magnetization direction, the fixed magnetization direction of the first and second sensors being substantially identical, and a sensitive layer having a variable magnetization direction, the variable magnetization direction of the first sensor when the first sensor is in a state of rest being substantially identical to the variable magnetization direction of the second sensor when the second sensor is in the state of rest. The air gaps of first and second sensor are oriented parallel to a direction XY which is, at ±15°, the bisector of the first and second directions.
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公开(公告)号：US09778324B2
公开(公告)日：2017-10-03
申请号：US14856302
申请日：2015-09-16
Applicant: Apple Inc.
Inventor： Henry H. Yang , Hyuk J. Choi
CPC classification number: G01R33/0011 , G01R33/093
Abstract: An electronic device may be provided with an electronic compass. The electronic compass may include magnetic sensors. The magnetic sensors may include thin-film magnetic sensor elements such as giant magnetoresistance sensor elements. Magnetic flux concentrators may be used to guide magnetic fields through the sensor elements. The magnetic flux concentrators may be configured to reduce the angular sensitivity of the magnetic sensors. A magnetic flux concentrator may be formed from multiple stacked layers of soft magnetic material separated by non-magnetic material. The non-magnetic material may have a thickness allows the magnetic layers to magnetically couple through the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction.
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公开(公告)号：US20170276739A1
公开(公告)日：2017-09-28
申请号：US15433849
申请日：2017-02-15
Applicant: Alps Electric Co., Ltd.
Inventor： Masayuki OBANA , Hideto ANDO , Yuki IMAI , Kunio YAMANAKA , Kyoko HOTTA , Akira MIYATAKE , Toshihiro KOBAYASHI , Kenichiro IKEDA , Takafumi NOGUCHI
CPC classification number: G01R33/091 , G01C21/08 , G01R33/0011
Abstract: A magnetic sensor including a first magneto resistive effect element located on a first surface of a substrate and having a sensitivity axis in a first direction that is one of in-plane directions of the first surface, a positioning soft magnetic body including a first most proximal portion of which a relative position with respect to the magneto resistive effect element is defined, and provided in a non-contact manner with respect to the first magneto resistive effect element, and a first soft magnetic body and a second soft magnetic body juxtaposed in the first direction and extending in a direction away from the first surface, and each of the first soft magnetic body and the second soft magnetic body is magnetically connected to the positioning soft magnetic body.
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公开(公告)号：US20170221510A1
公开(公告)日：2017-08-03
申请号：US15492638
申请日：2017-04-20
Applicant: Seagate Technology, LLC
Inventor： Adam A. Lapicki , Sameh Hassan , YuQing Du , Mark T. Kief , Marcus W. Ormston
IPC: G11B5/39
CPC classification number: G11B5/3912 , G01R33/0011 , G01R33/0017 , G01R33/0076 , G01R33/093 , G11B5/3932 , G11B5/398 , H01L43/08
Abstract: A data reader may consist of at least a magnetoresistive stack positioned on an air bearing surface. A portion of the magnetoresistive stack may be set to a first fixed magnetization by a pinning structure separated from the air bearing surface by a front shield that is set to a second fixed magnetization by a biasing structure. The front shield may be separated from the biasing structure by a coupling structure.
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公开(公告)号：US20170207015A1
公开(公告)日：2017-07-20
申请号：US15315515
申请日：2015-06-02
Applicant: MONASH UNIVERSITY , ALFRED HEALTH
Inventor： Malin PREMARATNE , Chintha HANDAPANGODA , Paul FITZGERALD , Philip LEWIS , Richard THOMSON
CPC classification number: H01F7/20 , A61N2/006 , A61N2/02 , G01R33/0011 , H01F1/14708 , H01F7/064
Abstract: A magnetic circuit (400) comprises a magnetic path which includes at least one magnetic source (102) arranged to generate magnetic flux within the magnetic path. A magnetic flux-concentrating element 402 is magnetically coupled to the magnetic source, and arranged to concentrate magnetic-flux generated by the magnetic source within a volume adjacent to the magnetic flux-concentrating element (402). Some embodiments of the magnetic circuit (400) comprise at least first (102) and second (104) magnetic sources, which may advantageously be arranged to generate magnetic flux in a common direction within the magnetic path.
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