Modulation method for improving giant magneto-impedance (GMI) effect of melt extraction amorphous microwires

An amorphous microwire and melt pulling technology is applied in the field of improving the modulation of the giant magneto-impedance effect of the melt-drawing amorphous microwire, which can solve problems such as the surface performance modulation of the amorphous microwire, and overcome the solder connection method. The shortcomings and limitations of the equipment, the simple process of the equipment, the effect of eliminating residual stress

Inactive Publication Date: 2017-10-17
BOHAI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the impedance response characteristics of magnetic sensitive devices, necessary modulation treatment is often required before application. Vacuum annealing, magnetic field annealing, current annealing, stress annealing, laser annealing, etc. are often used to release large residual internal stress and improve anisotropy. Among many methods, the surface properties of amorphous microwires are not modulated

Method used

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  • Modulation method for improving giant magneto-impedance (GMI) effect of melt extraction amorphous microwires
  • Modulation method for improving giant magneto-impedance (GMI) effect of melt extraction amorphous microwires
  • Modulation method for improving giant magneto-impedance (GMI) effect of melt extraction amorphous microwires

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Embodiment 1

[0020] Select the melt to draw Co 68.15 Fe 4.35 Si 12.25 B 13.75 Nb 1 Cu 0.5 Amorphous microwires, one end of the amorphous microwires is fixed on a flat copper fixture, and the other end is immersed in an electrolyte solution for electrolytic polishing, wherein, the proportion of the electrolyte solution is: phosphoric acid 369g (ρ=1.8434g / mL), CrO 3 101.25g, 12.5g of deionized water; the anode material is the amorphous microwire, the cathode material is 99.99% pure copper sheet, and the current density is 100A / dm 2 , the electropolishing time was 600s, and the electrolyte temperature was 45°C; the magnetic impedance performance test was performed on the treated amorphous microwire in a zero magnetic shielding space.

Embodiment 2

[0022] Select the melt to draw Co 68.15 Fe 4.35 Si 12.25 B 13.75 Nb 1 Cu 0.5 Amorphous microwires, one end of the amorphous microwires is fixed on a flat copper fixture, and the other end is immersed in an electrolyte solution for electrolytic polishing, wherein, the proportion of the electrolyte solution is: phosphoric acid 369g (ρ=1.8434g / ml), CrO 3 101.25g, 12.5g of deionized water; the anode material is the amorphous microwire, the cathode material is 99.99% pure copper sheet, and the current density is 150A / dm 2 , the electrolytic polishing time was 360s, and the electrolyte temperature was 45°C; the magnetic impedance performance test was performed on the treated amorphous microwire in a zero magnetic shielding space.

Embodiment 3

[0024] Select the melt to draw Co 68.15 Fe 4.35 Si 12.25 B 13.75 Nb 1 Cu 0.5 Amorphous microwires, one end of the amorphous microwires is fixed on a flat copper fixture, and the other end is immersed in an electrolyte solution for electrolytic polishing, wherein, the proportion of the electrolyte solution is: phosphoric acid 369g (ρ=1.8434g / ml), CrO 3 101.25g, 12.5g of deionized water; the anode material is the amorphous microwire, the cathode material is 99.99% pure copper sheet, and the current density is 150A / dm 2 , the electropolishing time was 600s, and the electrolyte temperature was 45°C; the magnetic impedance performance test was performed on the treated amorphous microwire in a zero magnetic shielding space.

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Abstract

A modulation method for improving the giant magneto-impedance effect of melt-drawn amorphous microwires. The method is to electrolytically polish the melt-drawn amorphous microwires. The process parameters are: cathode current density of 100A / dm2 to 150A / dm2 , the electrolytic polishing time is 360s-600s, the electrolyte temperature is 45°C, and the magnetic impedance output stability test is carried out on the treated amorphous microwire. The method has the advantages of simple process, low cost, strong operability and high efficiency, and can significantly improve the giant magneto-impedance characteristics of melt-drawn amorphous microwires. The surface rounding treatment of the wire is realized, and the cross-section roundness and surface roughness of the melt-drawn amorphous microwire are improved, especially suitable for sensors with high sensitivity to weak magnetic field detection.

Description

technical field [0001] The invention relates to a modulation method for improving the giant magneto-impedance effect of melt-pulled amorphous microwires. Background technique [0002] Amorphous microwire has a unique giant magneto-impedance (Giant Magneto-impedance, GMI) effect and has been widely concerned by the international academic community. changing phenomenon. Based on this characteristic, the giant magneto-impedance (GMI) magnetic sensor has been developed. (See V. Zhukova, M. Ipatov, A. Zhukov. "Thin Magnetically Soft Wires for Magnetic Microsensors". Sensors. 2009, 9:9216-9240.). [0003] At present, in the research of giant magneto-impedance effect, amorphous microfilaments are mainly obtained by glass wrapping method, water spinning method and melt drawing method. The melt drawing wire is relatively stable, and the diameter is also between 10 and 80 μm, which is convenient for circuit indirect and electronic packaging. In order to improve the impedance respo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/16
CPCC25F3/16
Inventor 陈东明孙剑飞王桂强吴志颖
Owner BOHAI UNIV
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