Characteristics of soft magnetic materials

　　1. In low magnetic field, magnetization can reach 80% to 90% of its saturation magnetization, that is, its initial permeability should be high, and the saturation magnetization should be high.

　　2. No (as small as possible) crystal anisotropy.

　　3. The magnetostrictive constant should be small to avoid anisotropy caused by stress; These are mostly metal or alloy soft magnetic materials.

　　When used in alternating magnetic fields, the hysteresis loop of soft magnetic materials should be as small as possible, because the magnetic loss is proportional to the area of the hysteresis loop. At low frequencies, soft magnetic materials are required to have high initial permeability, high saturation magnetization and low coercivity. However, when used at higher frequencies, the requirement of high saturation magnetization should be limited. In very high frequency use, because eddy current loss is proportional to the square of the frequency, it is important to require a high resistance of soft magnetic materials; Metropolitan chose to use ferrite soft magnetic materials.

　　Core soft magnetic material application

　　1. The application of strong current devices, generally in quasi-static or low frequency, large current use; Such as electromagnet, power transformer, motor and other iron core.

　　2. The application of weak current devices, generally in high frequency, weak current use. Such as communication equipment in the receiving antenna coil magnetic core, electronic circuit in the small transformer core.

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