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Method for improving sensitivity of metal fiber magnetic field

A magnetic field sensitivity and metal fiber technology, which is applied in the field of improving the magnetic field sensitivity of metal fibers, can solve the problems of low effective magnetic permeability, reduced impedance magnetic field response sensitivity, and large DC magnetic field, etc., to achieve the effect of improving magnetic field sensitivity

Inactive Publication Date: 2019-01-18
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a cross-field effect in the strip sample, which makes its effective permeability and GMI effect relatively low; in addition, its tangential anisotropy field is large, resulting in a large DC magnetic field corresponding to the peak value of the GMI effect, which reduces the magnetic field response of the impedance sensitivity

Method used

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  • Method for improving sensitivity of metal fiber magnetic field
  • Method for improving sensitivity of metal fiber magnetic field
  • Method for improving sensitivity of metal fiber magnetic field

Examples

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Effect test

Embodiment 1

[0050] The method for improving the magnetic field sensitivity of the metal fiber comprises the following steps: (1), testing the tensile stress-strain curve of the metal fiber. (2) Determine the yield strength and fracture strength of the metal fiber according to the strain curve. (3) Select a constant stress tensile metal fiber greater than the yield strength and less than the breaking strength.

Embodiment 2

[0052] The method for improving the magnetic field sensitivity of the metal fiber comprises the following steps: (1), testing the tensile stress-strain curve of the metal fiber. (2) Determine the yield strength and fracture strength of the metal fiber according to the strain curve. (3), select the constant stress tensile metal fiber greater than the yield strength, less than the breaking strength and 0.3 times of the breaking strength.

Embodiment 3

[0054] The method for improving the magnetic field sensitivity of the metal fiber comprises the following steps: (1), testing the tensile stress-strain curve of the Co-based metal fiber with a diameter of 20 μm. (2) Determine the yield strength and fracture strength of the metal fiber according to the strain curve. (3) Select a metal fiber with a constant stress that is greater than the yield strength, less than the breaking strength and 0.6 times the breaking strength and stretched for 0.5 min.

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Abstract

The invention provides a method for improving the sensitivity of a metal fiber magnetic field, and belongs to the technical field of magnetic metal fibers. The method for improving the sensitivity ofthe metal fiber magnetic field comprises the following steps that: (1) testing the stretching stress-strain curve of the metal fiber; (2) according to the strain curve, determining the yield strengthand the breaking strength of the metal fiber; and (3) selecting constant strain which is greater than the yield strength and smaller than the breaking strength to stretch the metal fiber. By use of the method, the sensitivity of the metal fiber magnetic field can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of magnetic metal fibers, in particular to a method for improving the magnetic field sensitivity of metal fibers. Background technique [0002] In 1992, Maori and others in Japan found that under the excitation of a stable AC current, the voltage value at both ends of the metal wire changes sensitively with the change of the DC magnetic field, that is, its impedance changes sensitively with the DC magnetic field, and the maximum impedance change rate reaches 75%. This phenomenon is called the giant magneto-impedance (GMI) effect. This phenomenon was also found in soft magnetic materials such as soft magnetic strips, thin films, and multilayer films. However, there is a cross-field effect in the strip sample, which makes its effective permeability and GMI effect relatively low; in addition, its tangential anisotropy field is large, resulting in a large DC magnetic field corresponding to the peak value of the...

Claims

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Application Information

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IPC IPC(8): G01N3/28
CPCG01N3/28G01N2203/0075
Inventor 张树玲陈炜晔耿桂宏邱明坤
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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