A low-power magnetoresistive sensor based on LTCC technology and its preparation method

A magnetoresistive sensor, low power consumption technology, applied in the direction of instruments, measuring magnetic variables, manufacturing measuring instruments, etc., can solve the problems of photolithography, increased coating times, increased sensor difficulty, high energy consumption, etc., to achieve easy large-scale Achieve, improve the magnetic field, simplify the effect of the preparation process

Active Publication Date: 2017-10-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method increases the number of photolithography and coating, and increases the difficulty of sensor preparation; in addition, the set / reset operation will be performed before each test, when it is applied to intensive, large data volume and uninterrupted When testing, the set / reset operation will bring large energy consumption

Method used

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  • A low-power magnetoresistive sensor based on LTCC technology and its preparation method
  • A low-power magnetoresistive sensor based on LTCC technology and its preparation method
  • A low-power magnetoresistive sensor based on LTCC technology and its preparation method

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preparation example Construction

[0032] A method for preparing a low-power magnetoresistive sensor based on LTCC technology provided by the invention, specifically comprises the following steps:

[0033] Step 1: Select non-magnetic LTCC microwave dielectric material as the casting substrate material, and use LTCC technology to make n-layer green ceramic tape diaphragm as the substrate;

[0034] Step 2: using silver paste to prepare the bottom coil by screen printing on the substrate obtained in step 1, and then preparing a green ceramic tape diaphragm on the bottom coil as the first green ceramic tape layer;

[0035] Step 3: Use silver paste to screen-print the top-layer coil on the first raw ceramic tape layer obtained in step 2, and connect the top-layer coil to the top-layer coil through the metal through hole in the center of the coil (using silver paste) to form a double-layer coupling layer of set / reset coils, such as figure 1 shown;

[0036] Step 4: Use LTCC technology to prepare 1-2 layers of green ...

Embodiment

[0040] A method for preparing a low-power magnetoresistive sensor based on LTCC technology, specifically comprising the following steps:

[0041] Step 1: Select Al 2 o 3 The LTCC material compounded with glass is used as the casting substrate material. Using LTCC technology, first stack about 400 μm green ceramic tape diaphragm to obtain the substrate;

[0042] Step 2: Use silver paste screen printing on the substrate obtained in step 1 to obtain the bottom coil, and then laminate a green ceramic tape diaphragm with a thickness of about 10 μm on the bottom coil as the first green ceramic tape layer ;

[0043] Step 3: On the first green tape layer obtained in step 2, use silver paste to screen-print the top layer coil, and connect the top layer coil to the top layer coil through the metal through hole in the center of the coil (using silver paste) to form a double layer A coupled set / reset coil layer, wherein the dimensions of the top and bottom coils are: dw1=60 μm, dw2=20 ...

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Abstract

The invention provides a low-power magnetoresistive sensor based on LTCC technology and a preparation method thereof, belonging to the technical field of magnetic materials and components. It includes a substrate, a bottom coil sequentially located on the substrate, a first green ceramic tape layer, a top layer coil, a second green ceramic tape layer, and a four-terminal Wheatstone bridge type anisotropic magnetoresistive sensing unit layer; The bottom coil and the top coil are connected through metal through holes, and the direction of current flow in the bottom coil and the top coil is consistent, which can enhance the magnetic field. The magnetoresistive sensor of the present invention adopts the set / reset coil layer with an optimized structure and is prepared by LTCC technology, so that it can provide a magnetic field that meets the application requirements without adding any magnetic auxiliary layer, and at the same time reduce the set / reset operation. low energy consumption, and the process is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and components, and in particular relates to a method for preparing a low-power magnetoresistive sensor using LTCC (Lowtemperature Co-fired Ceramics) technology. Background technique [0002] Anisotropic magnetoresistive sensors use magnetic materials, such as NiFe, CoFe, Co, etc., to present different resistance values ​​under different magnetic fields to detect external magnetic fields; among them, the size R of anisotropic magnetoresistance satisfies: R =R 0 +ΔRcos 2 θ(R 0 : resistance value under zero magnetic field; ΔR: maximum change value of anisotropic magnetoresistance; θ: angle between current direction and magnetization direction of magnetic layer). At present, this type of sensor has been widely used in magnetoresistive encoders, displacement sensors, electronic compasses and other fields. The United States Honeywell company is the main supplier of such sensors. At pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/09G01R3/00
Inventor 唐晓莉邹志理苏桦张怀武钟智勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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