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Giant magneto-impedance modeling method of amorphous wire under effect of non-axial magnetic field

An axial magnetic field and giant magneto-impedance technology, used in magnetic performance measurement, special data processing applications, instruments, etc., can solve the problems of complex magnetization process of amorphous wire, difficult to solve the magnetic moment equation, and impossible to obtain analytical solutions. , to achieve the effects of low power consumption, high sensitivity, and improved detection accuracy

Active Publication Date: 2018-03-02
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

Due to the complexity of the magnetization process of amorphous wires under a non-axial magnetic field, it is usually difficult to solve the magnetic moment equation, and it is almost impossible to obtain an analytical solution

Method used

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  • Giant magneto-impedance modeling method of amorphous wire under effect of non-axial magnetic field
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  • Giant magneto-impedance modeling method of amorphous wire under effect of non-axial magnetic field

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0011] The present invention combines prior knowledge such as ergonomics and sports health measurement to propose a brand-new feature point marking method, and the marking result has higher accuracy. The number and position of feature points can be increased or decreased according to actual needs. The specific definition rules and calibration methods of the feature points of each part are as follows.

[0012] The material adopted in the method of the invention is a Co-based amorphous wire with a negative magnetostriction coefficient close to zero. The Co-based amorphous wire has a core-shell magnetic domain structure when no external magnetic field is applied, the inner core has axial anisotropy, and the outer shell has alternately reversed circumferential anisotropy.

[0013] The working principle of amorphous wire is as follows: figure 1 A...

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Abstract

The invention provides a giant magneto-impedance modeling method of amorphous wire under the effect of a non-axial magnetic field. At first, by means of the LLG equation, a magnetization vector rotation equation is constrained and an expression of total energy inside amorphous wire is built; then, according to the principle of minimum free energy of system, a magnetization vector motion equation is built; amorphous wire magnetic conductivity tensor under the effect of a non-axial magnetic field is obtained through solving the motion equation; an electromagnetic field equation of the circumferential and axial magnetic field parameters of amorphous wire are established by using the intrinsic relationship between magnetic field strength and magnetic induction strength and Maxwell equation; finally, for the application conditions of high frequency and low frequency, the solution of the amorphous wire electromagnetic field equation is simplified; a general expression of amorphous wire giantmagneto-impedance by means of a high frequency and low frequency approximation. The giant magneto-impedance modeling of amorphous wire under effect of non-axial magnetic field can be accurately builtand the method for calculating giant magneto-impedance is given.

Description

technical field [0001] The invention belongs to the technical field of magnetic material sensing, and in particular relates to a giant magneto-impedance modeling method under the action of a non-axial magnetic field. Background technique [0002] Amorphous wire has high magnetic permeability, low coercive force, significant magneto-impedance effect and high sensitivity under low field. Compared with some existing semiconductor devices, magnetoresistance devices, and fluxgates, the magnetic field of amorphous wire The sensor combines the advantages of stability, high sensitivity, miniaturization and low power consumption. Amorphous wire sensors are widely used in industry, navigation, military, security, non-destructive testing, geomagnetism and biomedicine, such as high-density magnetic recording equipment, micro-magnetic equipment, military sensors, traffic monitoring, satellite aircraft detection, industrial equipment Amorphous wire sensors are used in control and geomagn...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01R33/12
CPCG01R33/1223G06F30/20
Inventor 许洪光路小菲胡琴芳
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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