Experimental apparatus for giant magneto-impedance (GMI) of amorphous wires

Abstract

The invention relates to an experimental apparatus for giant magneto-impedance (GMI) of amorphous wires, which consists of an experimental apparatus host, an external controlled field coil and a GMI sensor experimental platform, wherein a five-digit digital display frequency meter, a four-digit digital display ammeter, a four-digit digital display voltmeter, a function selection switch, a current display switching button, a voltage display switching button, eight numerical control buttons and two signal output ports are arranged on the experimental apparatus host; and a high current and constant current source, a high-precision signal generator and a singlechip control and amplifying circuit are arranged in the experimental apparatus host. Through the measurement of the GMI of the amorphous wires, the students can better understand and master the laws and characteristics of the GMI effect, and can deeply understand the physical significances of magnetic domain, magnetization, skin effect and impedance, etc. The experimental apparatus has a reasonable structure and good teaching effect, is convenient to operate and is applicable to teaching experiments of subjects like electromagnetism, physics and electronics in the universities and colleges.

Description

technical field [0001] The invention relates to an amorphous wire giant magnetoresistance experimental instrument, which belongs to the experimental field of electromagnetism, physics and other related courses in colleges and universities. Background technique [0002] The Giant Magneto-impedance (GMI) effect is a new phenomenon discovered in the 1990s, which refers to the characteristic that the AC impedance of a material changes drastically with the change of the external DC magnetic field. Giant magnetoresistance is generally defined as (Z H -Z 0 ) / Z 0 , where Z 0 and Z H Respectively represent the AC impedance of the soft magnetic material under no external magnetic field and an external magnetic field, and the ratio indicates the sensitivity of the material to changes in the magnetic field. [0003] In 1992, Professor Mohri and others from Nagoya University in Japan first observed the ΔZ / Z of the material under a magnetic field in FeCoSiB amorphous soft magnetic wi...

AI Technical Summary

Problems solved by technology

[0005] Existing research on giant magneto-impedance is mostly concentrated in the laboratories of scientific research institutes or students at the postgraduate level. For the experimental research on giant magneto-impedance phenomena, various experimental equipment such as constant current sources and signal generators must be used. Complicated combinations are not convenient for ordinary students to grasp the giant magneto-impedance effect

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