When we talk about the magnetic source of magnetic materials, electromagnetic induction, magnetic devices, we have already mentioned some magnetic materials.
Practical application. In fact, magnetic materials have been widely used in various aspects of traditional industries. For example, if there is no magnetic material, electrification becomes impossible, because generators are used for power generation, transformers are used for power transmission, and speakers are used for electric machines, telephones, radios, and televisions. Magnetic steel coil structures are used in many instruments. These have already been said when talking about other content.