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公开(公告)号：US12081176B2
公开(公告)日：2024-09-03
申请号：US17904515
申请日：2021-02-09
Applicant: MultiDimension Technology Co., Ltd.
Inventor： Zhimin Zhou , James Geza Deak
CPC classification number: H03F1/34 , G01R33/0094 , G01R33/091
Abstract: A gain-controllable magnetoresistive analog amplifier includes a substrate in an X-Y plane, an output signal magnetoresistive sensor on the substrate, and an input signal coil and a gain adjustment coil. The input signal coil and the gain adjustment coil are respectively on two side surfaces of the sensor. The gain adjustment coil is used to input a gain signal by the generation of a gain magnetic field, in order to set the gain the magnetic field is applied along a magnetization direction of a free layer of the output signal magnetoresistive sensor. The input signal coil is used for inputting a current signal to generate an input magnetic field, in order to apply the input magnetic field to a magnetization direction of a pinned layer of the output signal magnetoresistive sensor. This amplifier provides isolation between input signals, output signals, and controllable gain signals.
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公开(公告)号：US12066401B2
公开(公告)日：2024-08-20
申请号：US17755180
申请日：2020-10-27
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza Deak , Zhimin Zhou
CPC classification number: G01N27/72 , G01N33/005
Abstract: A hydrogen gas sensor utilizing electrically isolated tunneling magnetoresistive stress sensing elements is disclosed. The hydrogen gas sensor comprises: a deformable substrate, a magnetoresistive bridge stress sensor located on the deformable substrate, an electrical isolation layer covering the magnetoresistive bridge stress sensor, a magnetic shielding layer located on the electrical isolation layer, and a hydrogen sensing layer located above the deformable substrate. The hydrogen sensing layer is located in a plane perpendicular to the deformation of the substrate covering the electrical isolation layer. The hydrogen sensing layer is used for absorbing or desorbing hydrogen gas to generate expansion or contraction deformation and cause a stress change of the deformable substrate. The magnetoresistive bridge stress sensor is used for measuring a hydrogen gas concentration utilizing the stress change of the deformable substrate. It results in a hydrogen gas sensor with improved performance.
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3.发明授权公开(公告)号：US12055605B2
公开(公告)日：2024-08-06
申请号：US17753360
申请日：2020-08-18
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza Deak , Zhimin Zhou
CPC classification number: G01R33/098 , G01N33/005
Abstract: A hydrogen gas sensor utilizing electrically isolated tunneling magnetoresistive sensing elements is provided. The hydrogen gas sensor comprises: a substrate in an X-Y plane, tunneling magnetoresistive sensors located on the substrate, and a hydrogen sensing layer located on the tunnel magnetoresistive sensors. The hydrogen sensing layer and the tunneling magnetoresistive sensor are electrically isolated from each other. The hydrogen sensing layer includes a multi-layer thin film structure formed from palladium layers and ferromagnetic layers, wherein the palladium layers are used for absorbing hydrogen in the air that causes a change in the orientation angle of a magnetic anisotropy field in each of the ferromagnetic layers in the X-Z plane into an X-axis direction. The tunnel magnetoresistive sensors are used for detecting a magnetic field signal of the hydrogen sensing layer, wherein the magnetic signal determines the hydrogen gas concentration. This hydrogen gas sensor ensures measurement safety.
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公开(公告)号：US20240255271A1
公开(公告)日：2024-08-01
申请号：US18551379
申请日：2022-03-16
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza DEAK , Zhimin ZHOU
CPC classification number: G01B7/30 , G01R33/0094 , G01R33/093
Abstract: Disclosed in the embodiments of the present invention is a low-magnetic-field magnetoresistive angle sensor. The sensor comprises: a substrate located in an X-Y plane, and a magnetoresistive sensing unit located on the substrate. The magnetoresistive sensing unit comprising a multi-layer thin film structure. The multi-layer thin film structure comprises at least a stack of a free layer, a barrier layer, and a reference layer. The magnetoresistive sensing unit has an oval shape. The oval-shaped free layer has a long axis Ly, a short axis Lx, and a thickness Lz. Additionally the free layer has a saturation magnetic field, a shape anisotropy demagnetizing field, and a magnetocrystalline anisotropy field in the X direction. When an external magnetic field rotates by 0-360° in the X-Y plane, the magnetocrystalline anisotropy field is compensated by the shape demagnetizing field to cause the effective anisotropy field of the free layer to be close to 0, such that the external magnetic field has a low working magnetic field value close to that of the saturation magnetic field of the free layer material. The embodiments of the present invention can improve the accuracy of angle measurement of a magnetoresistive angle sensor. Additionally because the required external magnetic field is low, the sensor can be implemented at low cost.
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公开(公告)号：US11852698B2
公开(公告)日：2023-12-26
申请号：US16497409
申请日：2018-03-22
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza Deak , Elamparithi Visvanathan
CPC classification number: G01R33/091 , G01R33/0011
Abstract: A magnetic sensor packaging structure with a hysteresis coil comprising a substrate, a sensor chip, a spiral hysteresis coil on the substrate, and wire bonding pads. The sensor bridge arms are composed of magnetoresistive sensing elements. The sensor bridge arms are deposited on the sensor chip, and the sensor bridge arms are electrically interconnected to form a magnetoresistive sensor bridge that is located on the hysteresis coil. The magnetic field generated by the spiral hysteresis coil is collinear with a sensitive axis of the sensor bridge. The magnetoresistive sensor bridge is located on the substrate and encapsulated. By placing the spiral hysteresis coil on the substrate, it is capable of supporting larger currents with smaller resistance value. This allows the sensor hysteresis to be effectively eliminated. In addition, the packaging structure manufacturing process is simple and cost effective.
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Patent Agency Ranking
公开(公告)号：US20230176148A1
公开(公告)日：2023-06-08
申请号：US16497409
申请日：2018-03-22
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza Deak , Elamparithi Visvanathan
CPC classification number: G01R33/091 , G01R33/0011
Abstract: A magnetic sensor packaging structure with a hysteresis coil comprising a substrate, a sensor chip, a spiral hysteresis coil on the substrate, and wire bonding pads. The sensor bridge arms are composed of magnetoresistive sensing elements. The sensor bridge arms are deposited on the sensor chip, and the sensor bridge arms are electrically interconnected to form a magnetoresistive sensor bridge that is located on the hysteresis coil. The magnetic field generated by the spiral hysteresis coil is collinear with a sensitive axis of the sensor bridge. The magnetoresistive sensor bridge is located on the substrate and encapsulated. By placing the spiral hysteresis coil on the substrate, it is capable of supporting larger currents with smaller resistance value. This allows the sensor hysteresis to be effectively eliminated. In addition, the packaging structure manufacturing process is simple and cost effective.
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公开(公告)号：US20230084058A1
公开(公告)日：2023-03-16
申请号：US17904515
申请日：2021-02-09
Applicant: MultiDimension Technology Co., Ltd.
Inventor： Zhimin ZHOU , James Geza DEAK
Abstract: A gain-controllable magnetoresistive analog amplifier comprises a substrate located in an X-Y plane, an output signal magnetoresistive sensor located on the substrate, and an input signal coil and a gain adjustment coil. The input signal coil and the gain adjustment coil are respectively located on two side surfaces of the output signal magnetoresistive sensor. The gain adjustment coil is used to input a gain signal by the generation of a gain magnetic field, in order to set the gain the magnetic field is applied along a magnetization direction of a free layer of the output signal magnetoresistive sensor, thereby adjusting the slope of the input resistance-magnetic field transfer curve of the output signal magnetoresistive sensor. The input signal coil is used for inputting a current signal to generate an input magnetic field, in order to apply the input magnetic field to a magnetization direction of a pinned layer of the output signal magnetoresistive sensor, thereby controlling the gain signal to adjust a gain factor of an output signal after the current signal passes through the output signal magnetoresistive sensor. This magnetoresistive analog amplifier provides isolation between input signals, output signals, and controllable gain signals.
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公开(公告)号：US11512939B2
公开(公告)日：2022-11-29
申请号：US16488549
申请日：2018-02-14
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza Deak , Zhimin Zhou
Abstract: A single-chip two-axis magnetoresistive angle sensor comprises a substrate located in an X-Y plane, a push-pull X-axis magnetoresistive angle sensor and a push-pull Y-axis magnetoresistive angle sensor located on the substrate. The push-pull X-axis magnetoresistive angle sensor comprises an X push arm and an X pull arm. The push-pull Y-axis magnetoresistive angle sensor comprises a Y push arm and a Y pull arm. Each of the X push, X pull, Y push arm, and Y pull arms comprises at least one magnetoresistive angle sensing array unit. The magnetic field sensing directions of the magnetoresistive angle sensing array units of the X push, X pull, Y push, and Y pull arms are along +X, −X, +Y and −Y directions respectively. Each magnetoresistive sensing unit comprises a TMR or GMR spin-valve having the same magnetic multi-layer film structure. A magnetization direction of an anti-ferromagnetic layer is set into a desired orientation through the use of a laser controlled magnetic annealing, and a magnetic field attenuation layer can be deposited in the surface of the magnetoresistance angle sensing unit.
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公开(公告)号：US20220373513A1
公开(公告)日：2022-11-24
申请号：US17755180
申请日：2020-10-27
Applicant: MultiDimension Technology Co., Ltd.
Inventor： James Geza DEAK , Zhimin ZHOU
Abstract: A hydrogen gas sensor utilizing electrically isolated tunneling magnetoresistive stress sensing elements is disclosed. The hydrogen gas sensor comprises: a deformable substrate, a magnetoresistive bridge stress sensor located on the deformable substrate, an electrical isolation layer covering the magnetoresistive bridge stress sensor, a magnetic shielding layer located on the electrical isolation layer, and a hydrogen sensing layer located above the deformable substrate. The hydrogen sensing layer is located in a plane perpendicular to the deformation of the substrate covering the electrical isolation layer. The hydrogen sensing layer is used for absorbing or desorbing hydrogen gas to generate expansion or contraction deformation and cause a stress change of the deformable substrate. The magnetoresistive bridge stress sensor is used for measuring a hydrogen gas concentration utilizing the stress change of the deformable substrate. It results in a hydrogen gas sensor with improved performance.
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公开(公告)号：US11346901B2
公开(公告)日：2022-05-31
申请号：US16091930
申请日：2017-04-05
Applicant: MultiDimension Technology Co., Ltd.
Inventor： Songsheng Xue , Xiaofeng Lei , Weifeng Shen , Lixian Feng
IPC: G01R33/09
Abstract: An anisotropic magnetoresistive (AMR) sensor without a set and reset device may include a substrate, an exchange bias layer, an AMR layer and a collection of barber-pole electrodes. The exchange bias layer may be deposited on the substrate and the AMR layer may be deposited on the exchange bias layer. The AMR layer may include multiple groups of AMR strips, and each group may include several AMR strips. The barber-pole electrodes may be arranged on each AMR strip. The AMR sensor achieves coupling by using the exchange bias layer, without requiring a reset/set coil. Because a coil is not used, the power consumption of the chip is reduced greatly, and the manufacturing process is simpler, providing improved yield and lower cost.
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