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Giant magnet impedance effect composite wire with barrier layer and its preparing method

A technology of giant magneto-impedance and barrier layer, which is applied in the field of magneto-impedance effect composite wire and its preparation, can solve the problems of lower drive current frequency, affect the application of products, and poor performance repeatability, and achieve drive current frequency reduction and cost reduction. The effect of low and stable product performance

Inactive Publication Date: 2004-12-15
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The GMI amplitude is larger than that of the single-structure wire, and the driving current frequency is also reduced, but its low-frequency characteristics and GMI characteristics need to be further improved.
In addition, the electroplating method can only be plated on the conductor substrate, and the repeatability of the plating on the wire is not good, which affects its application in products.

Method used

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  • Giant magnet impedance effect composite wire with barrier layer and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step The metal wire 1 is a copper wire with a diameter of 190 μm, and the barrier layer 2 is a polyester paint with a thickness of 2 μm.

[0038] The third step is electroless plating of the soft magnetic layer, that is, the soft magnetic layer 3 is NiFeB, FN=0.3, the plating time is 60 minutes, and the thickness of the coating is 9.0 μm.

[0039] The fourth step is annealing at 180°C for 30 minutes.

[0040] When the applied magnetic field is 0-60 Oersted and the driving current frequency is 1MHz, the amplitude of the impedance effect is 110%.

Embodiment 2

[0042] Step 1 Metal wire 1 is silver wire with a diameter of 100μm, barrier layer 2 is SiO 2 , with a thickness of 2 μm.

[0043] The third step is electroless plating of the soft magnetic layer, that is, the soft magnetic layer 3 is NiFeB, FN=0.3, the plating time is 45 minutes, and the thickness of the coating is 6.3 μm.

[0044] The fourth step is annealing at 220°C for 30 minutes.

[0045] When the applied magnetic field is 0-60 Oersted and the driving current frequency is 1MHz, the amplitude of the impedance effect is 152%.

Embodiment 3

[0047] The first step The metal wire 1 is a beryllium copper wire with a diameter of 100 μm, and the barrier layer 2 is a polyester paint with a thickness of 2 μm.

[0048] The third step is electroless plating of the soft magnetic layer, that is, the soft magnetic layer 3 is NiFeB, FN=0.3, the plating time is 30 minutes, and the coating thickness is 3.0 μm.

[0049] The fourth step is annealing at 200°C for 30 minutes.

[0050] When the applied magnetic field is 0-60 Oersted and the driving current frequency is 700KHz, the amplitude of the impedance effect is 212%.

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Abstract

The present invention relates to composite wire with barrier layer possessing giant magnetic impedance effect, and belongs to the fields of magnetic sensing, storing and information functional material and the preparation technology. The composite wire consists of metal wire, barrier layer and soft magnetic layer. The barrier layer of insulating material is attached to the surface of the metal wire, and the soft magnetic layer of GMI soft magnetic material is attached to the surface of the barrier layer. The preparation process includes painting barrier layer onto the metal wire, chemically plating the soft magnetic layer onto the barrier layer, and annealing. The composite wire with giant magnetic impedance effect has simple preparation process, relatively high giant magnetic impedance effect and low work frequency and may be used in device conveniently and reliably.

Description

technical field [0001] The invention relates to a giant magneto-impedance effect composite wire with a barrier layer and a preparation method thereof, belonging to the technical field of magnetic sensing storage and information functional materials and preparation thereof. Background technique [0002] The giant magneto-impedance effect (GMI) refers to the characteristic that the AC impedance of some soft magnetic materials changes greatly after an external magnetic field is applied. Due to its high sensitivity, small size, fast response, non-contact and other advantages, GMI materials have attracted attention in the fields of high-sensitivity magnetic sensors, magnetic recording read heads, magnetic encoders, and automotive automatic guidance, and will play a great role. GMI devices are developing towards miniaturization and integration. [0003] Common GMI materials include film and silk. Regarding the development of GMI thin films, it has developed...

Claims

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Application Information

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IPC IPC(8): G01R33/09G11B5/39
Inventor 袁望治王新征吴士蓉赵振杰阮建中杨燮龙
Owner EAST CHINA NORMAL UNIV
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