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
CN107748813AActive Publication Date: 2018-03-02HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Publication Date
2018-03-02

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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.
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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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