Under low magnetic fields, magnetization can reach 80% -90% of its saturation magnetization strength, which means its initial magnetic permeability should be high and the saturation magnetization strength should also be high.

2. There is no (as small as possible) crystal anisotropy.

3. The magnetic contraction constant should be small to avoid stress causing anisotropy; These are mostly soft magnetic materials made of metals or alloys.

1. The application of high current devices is generally used under quasi-static or low-frequency, high current conditions; Iron cores such as electromagnets, power transformers, motors, etc.

2. The application of weak current devices is generally used at high frequencies and weak currents. For example, the magnetic core of the receiving antenna coil in communication equipment, and the iron core of small transformers in electronic circuits.