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What Do You Know About Magnetic Assemblies? ​

How to understand the magnetic assembly materials? Materials that can react to magnetic fields in some way are called magnetic assembly materials. According to the magnetic strength of substances in the external magnetic field, they can be divided into diamagnetic substances, paramagnetic substances, ferromagnetic substances, antiferromagnetic substances and ferrimagnetic substances. Most materials are diamagnetic or paramagnetic, and their response to external magnetic field is weak.

1. Introduction to materials of magnetic assemblies

Ferromagnetic substances and ferrimagnetic substances are strong magnetic substances. Generally speaking, the magnetic assembly materials refer to strong magnetic assembly materials. For magnetic assembly materials, magnetization curve and hysteresis loop are characteristic curves reflecting their basic magnetic properties. Ferromagnetic assembly materials are generally Fe, Co, Ni elements and their alloys, rare earth elements and their alloys, and some Mn compounds. According to the difficulty of magnetization, magnetic assembly materials are generally divided into soft magnetic materials and hard magnetic materials.

Experiments show that any substance can be more or less magnetized in an external magnetic field, but the degree of magnetization is different. According to the characteristics of substances in the external magnetic field, substances can be divided into five categories: paramagnetic substances, diamagnetic substances, ferromagnetic substances, ferrimagnetic substances and anti-magnetic substances.

According to the molecular current hypothesis, matter should show roughly similar characteristics in the magnetic field, but here we know that the characteristics of matter in the external magnetic field are very different. This reflects the limitations of the molecular current hypothesis. In fact, the microstructure of various substances is different, and the difference of material structure is the reason for the difference of material magnetism. We call paramagnetic materials and diamagnetic materials weak magnetic materials, and ferromagnetic materials strong magnetic materials.

2. Magnetic assembly materials refer to strong magnetic materials

According to the difficulty of demagnetization after magnetization, magnetic assembly materials can be divided into soft magnetic assembly materials and hard magnetic assembly materials. The material that is easy to remove magnetism after magnetization is called soft magnetic assembly material, and the material that is not easy to demagnetize is called hard magnetic assembly material. Generally speaking, the remanence of soft magnetic product materials is small, and that of hard magnetic assembly materials is large.

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