What is soft magnetic material

Refers to those materials that are easy to magnetize and can be magnetized repeatedly, but when the magnetic field is removed, the magnetism disappears. The characteristic sign of this type of material is: high magnetic permeability (μ=B/H), that is, it is easy to be magnetized in a magnetic field and quickly reach a high magnetization intensity; but when the magnetic field disappears, its remanence is very small. This material is widely used in high-frequency technology in electronic technology. Such as magnetic cores, magnetic heads, memory magnetic cores; it can be used to make transformers, switch relays, etc. in strong current technology. Commonly used soft magnets are iron-silicon alloys, iron-nickel alloys, and amorphous metals.

Fe-(3%~4%)Si iron-silicon alloy is the most commonly used soft magnetic material, which is often used as the iron core of low-frequency transformers, motors and generators; the performance of iron-nickel alloy is better than iron-silicon alloy, and the typical representative material is Permalloy (Permalloy), its composition is 79%Ni-21%Fe, Permalloy has high permeability (permalloy μ is 10-20 times that of iron-silicon alloy), low loss; With high permeability and low coercivity in the magnetic field, it is widely used in the telecommunications industry, electronic computers and control systems. It is an important electronic material; the difference between amorphous metal (metal glass) and general metal is its structure It is amorphous. They are composed of Fe, Co, Ni and the semi-metallic elements B and Si. The main point of their production process is to cool the metal liquid at a very fast speed, so that the solid metal can obtain an amorphous structure with irregularly arranged atoms. Amorphous metals have very good magnetic properties, and they have been used in low-energy-consumption transformers, magnetic sensors, recording heads, etc. In addition, some amorphous metals have excellent corrosion resistance, and some amorphous metals have the characteristics of high strength and good toughness.