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High-precision composite magnetic gradiometer based on superconductivity and tunneling magnetoresistance

A technology of tunneling magnetoresistance and magnetic gradiometer, applied in the field of magnetic sensors, can solve problems such as inability to output gradient signals, difficulty in device preparation, complex process, etc., and achieve simple structure and preparation, low difficulty in process integration, and small volume Effect

Active Publication Date: 2020-09-04
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the detection of weak signal gradients is mainly based on the planar magnetic field gradiometer composed of superconducting quantum interference devices and magnetic field gradient coils. Two identical coils need to be prepared and placed symmetrically in the superconducting loop, and superconducting quantum interference must also be considered. The inductance matching problem between the interference device and the magnetic field gradient coil makes the preparation of the device difficult and the process is complicated; in addition, the superconducting quantum interference device itself is a superconducting ring, and the device has a non-zero response when the external magnetic field gradient is zero, and the ideal gradient signal cannot be output ; and the overall system of the device also has the disadvantages of large volume and low integration

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  • High-precision composite magnetic gradiometer based on superconductivity and tunneling magnetoresistance
  • High-precision composite magnetic gradiometer based on superconductivity and tunneling magnetoresistance
  • High-precision composite magnetic gradiometer based on superconductivity and tunneling magnetoresistance

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Embodiment 1

[0028] Such as figure 1 and 2 As shown, the high-precision composite magnetic gradiometer based on superconducting and tunneling magnetoresistance in this embodiment includes a superconducting closed loop layer 1, an insulating layer 2 and a tunneling magnetoresistance device layer 3 from bottom to top. Conductive closed loop layer 1 includes two superconducting rings 11 located in the same plane and arranged mirror-symmetrically. Superconducting ring 11 includes a narrow region 111, a wide region 112 and a connecting portion for connecting the narrow region 111 and the wide region 112. 113 , the narrow regions 111 of the two superconducting rings 11 are arranged close to each other, and the tunneling magnetoresistive device layer 3 is located above the narrow regions 111 of the two superconducting rings 11 .

[0029] In this embodiment, the superconducting ring 11 is a closed loop including a narrow region 111 , a wide region 11 and a connecting portion 113 , the wide region...

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Abstract

The invention discloses a high-precision composite magnetic gradiometer based on superconductivity and tunneling magnetoresistance. The gradiometer sequentially comprises a superconducting closed looplayer, an insulating layer and a tunneling magnetoresistance device layer from bottom to top; the superconducting closed loop layer comprises two superconducting rings which are positioned in the same plane and are arranged in a mirror symmetry manner; each superconducting ring comprises a narrow area, a wide area and a connecting part used for connecting the narrow area and the wide area, and the narrow areas of the two superconducting rings are arranged close to each other; and the tunneling magnetoresistance device layer is located above the narrow areas of the two superconducting rings. The high-precision composite magnetic gradiometer has the advantages of being simple in structure and capable of carrying out ultra-high sensitivity testing on the magnetic field gradient.

Description

technical field [0001] The invention relates to the field of magnetic sensors, in particular to a high-precision composite magnetic gradiometer based on superconducting and tunneling magnetoresistance. Background technique [0002] Weak magnetic detection plays an important role and has broad application prospects in scientific research, national defense, industrial production and other fields. Due to the existence of background signals such as the geomagnetic field, there are great challenges in weak magnetic detection. The traditional magnetic shielding technology can suppress the background signal to a certain extent, but the cost is high, the processing is difficult, and the volume is large. The magnetic gradiometer can obtain effective weak magnetic signals without magnetic shielding, which provides an important way to develop the research and application of weak magnetic signals. For example, when used to measure biological magnetic signals, the magnetic gradiometer ...

Claims

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Application Information

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IPC IPC(8): G01R33/022G01R33/035G01R33/09
CPCG01R33/022G01R33/035G01R33/098
Inventor 李裴森胡佳飞潘孟春杨澜张琦彭俊平邱伟成冀敏慧
Owner NAT UNIV OF DEFENSE TECH
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