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Method for improving giant magneto-impedance effect of materials

A giant magneto-impedance and effect technology, applied in the field of improving the giant magneto-impedance effect of materials, can solve problems such as expensive and difficult implementation

Inactive Publication Date: 2013-05-15
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two methods mentioned above can improve the giant magnetoresistance change rate of the material very well, but it is difficult to implement and even requires expensive experimental equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] FeSO 4 ·7H 2 O, NiSO 4 ·7H 2 O, boric acid, saccharin, glycine, ascorbic acid soluble in 40 o C-60 o Stir well in the deionized water of C, the concentration is FeSO 4 ·7H 2 O concentration 0.01 M / L, NiSO 4 ·7H 2 The concentration of O was 0.01 M / L, that of boric acid was 0.3 M / L, that of saccharin was 2 g / L, that of glycine was 1 g / L, and that of corbic acid was 5 g / L. During electroplating, a three-electrode system is adopted, the anode is a platinum electrode, the cathode is a white copper wire with an outer diameter of 155 microns, and the electroplating time is 800s. so as to get Ni 80 Fe 20 / white copper wire composite structure, in which the thickness of the magnetic layer is 5 microns. Apply tensile force to the prepared composite structure wire, the force per unit area is 10-80 MPa, remove the tensile stress load, and measure the rate of change of giant magnetic impedance. When the DC magnetic field is 80 Oersted and the AC frequency is 30KHz, the m...

Embodiment 2

[0027] FeSO 4 ·7H 2 O, NiSO 4 ·7H 2 O, boric acid, saccharin, glycine, ascorbic acid soluble in 40 o C-60 o Stir well in the deionized water of C, the concentration is FeSO 4 ·7H 2 O concentration 0.01 M / L, NiSO 4 ·7H 2 The concentration of O was 0.01 M / L, that of boric acid was 0.3 M / L, that of saccharin was 2 g / L, that of glycine was 1 g / L, and that of corbic acid was 5 g / L. During electroplating, a three-electrode system is adopted, the anode is a platinum electrode, the cathode is a white copper wire with an outer diameter of 155 microns, and the electroplating time is 800s. so as to get Ni 80 Fe 20 / white copper wire composite structure, in which the thickness of the magnetic layer is 5 microns. Apply a tensile force of 100-130 MPa to the prepared composite structural wire, remove the tensile stress load, and measure the rate of change of giant magnetic impedance. When the DC magnetic field is 80 Oersted and the AC frequency is 10KHz, the measured giant magnet...

Embodiment 3

[0029]FeSO 4 ·7H 2 O, NiSO 4 ·7H 2 O, boric acid, saccharin, glycine, ascorbic acid soluble in 40 o C-60 o Stir well in the deionized water of C, the concentration is FeSO 4 ·7H 2 O concentration 0.01 M / L, NiSO 4 ·7H 2 The concentration of O was 0.01 M / L, that of boric acid was 0.3 M / L, that of saccharin was 2 g / L, that of glycine was 1 g / L, and that of corbic acid was 5 g / L. During electroplating, a three-electrode system is adopted, the anode is a platinum electrode, the cathode is a white copper wire with an outer diameter of 155 microns, and the electroplating time is 800s. so as to get Ni 80 Fe 20 / white copper wire composite structure, in which the thickness of the magnetic layer is 5 microns. Apply a tensile force of 140-170 MPa to the prepared composite structural wire, remove the tensile stress load, and measure the change rate of giant magnetic impedance. When the DC magnetic field is 80 Oersted and the AC frequency is 4KHz, the measured giant magnetic im...

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Abstract

The invention discloses a method for improving giant magneto-impedance effect of composite materials, wherein the composite materials are formed by electric conduction metal, and the surface of the electric conduction metal is adhered with a soft magnetism thin film. According to the method, pulling stress is exerted on metal wires. Though the method is simple, giant impedance characteristics of silk-shaped composite materials can be improved notably. Low frequency characteristics of a composite structure are more notable with the increase of the exerted pulling stress, and change rate of giant magneto-impedance rate is larger. According to test results, impedance can be changed when small pulling stress is exerted to receiving materials. When loading of the pulling stress is dismounted, the materials can still keep the giant magneto-impedance rate changing effect generated through the pulling stress.

Description

technical field [0001] The invention relates to a method for improving the giant magneto-impedance effect of a material, specifically, the invention relates to a method for improving the giant magneto-impedance effect of a metal wire composite material with a soft magnetic film attached to its surface. Background technique [0002] In recent years, the giant magnetoimpedance effect has attracted extensive attention, and this effect can be used in novel magnetic field sensors. Specifically, the giant magnetoimpedance effect is that when an alternating current is applied to the material, it can be found that the external magnetic field can cause a huge change in the electrical impedance of the material. Magneto-sensitive devices require materials with good resistance change rate and high magnetic field sensitivity, so many researches are now focused on improving the giant magneto-impedance effect of materials. At present, the commonly used materials with GMI effect in practi...

Claims

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Application Information

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IPC IPC(8): H01L43/12H01L43/10
Inventor 王建波罗彩勤张毅刘青芳
Owner LANZHOU UNIVERSITY
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