Study On Static Magnetization Calculation Of Anisotropic Amorphous Wires

The metal label system engraves graphic symbols on the surface of metal objects or metal labels,and uses the arrangement of different symbols to encode information,which is a supplement to the existing Internet of Things sensing technology.The main method of metal tag detection is electromagnetic detection.This topic is the first to propose a surface magnetic field tomography imaging method based on amorphous wire at home and abroad,which can image the surface magnetic field generated by the metal tag induced current.Amorphous alloy with small size and high sensitivity.When a high-frequency alternating excitation is used to drive an amorphous material,when a small external magnetic field is applied in the axial direction of the amorphous wire,the alternating current resistance at both ends of the amorphous wire changes greatly.This phenomenon is called giant magnetic impedance(GMI)effect.In this project,the amorphous wire needs to sense the magnetic field in any direction.At present,the theoretical research of the existing amorphous wire is based on the direction of the external magnetic field,but the magnetic permeability of the amorphous wire under the action of the non-axial magnetic field is variable and internal magnetization is not uniform.Therefore,the study of the static magnetization of amorphous wires under transverse magnetic field is beneficial to expand the application range of amorphous wires in the project.This paper focuses on the static magnetization of amorphous wires in the transverse magnetic field.The basic theory of magnetostatics,the formation of magnetic domains inside the amorphous wire,and its magnetization process and hysteresis loop are described.By analyzing the magnetization characteristics of the amorphous wire under the transverse magnetic field,the magnetization model of the amorphous wire is established on the basis of electromagnetics,and the magnetic shielding phenomenon in the amorphous wire and the magnetization phenomenon caused by the skin effect are obtained.The increase in magnetic permeability tends to the outer surface,and the relationship between the GMI effect of the amorphous wire under the transverse magnetic field and the external magnetic field is analyzed.At the same time,the relationship between the anisotropy field and the impedance of the amorphous wire is obtained.According to the equation derivation,the static magnetization analytic formula of the amorphous wire under the external transverse magnetic field is obtained.The two numerical solution methods are used: the finite difference method and the Fourier spectrum method to solve the equation,and the internal loop of the amorphous wire is obtained by using MATLAB.Magnetic field strength and radial magnetic field strength results.The numerical solution results verify the magnetic shielding phenomenon of the amorphous wire under the transverse magnetic field and the specific static magnetization relationship.At the same time,the calculation results provide a specific data basis for the magnetization analysis.