Magnet classification:

Shape magnets: square magnets, arc magnets, irregular magnets, cylindrical magnets, circular magnets, circular magnets, bar magnets, magnetic frame magnets.

Attribute magnets: SmCo magnets, NdFeB magnets, ferrite magnets, AlNiCo magnets, Fe Cr Co magnets;

Industrial magnets: magnetic parts, motor magnets, rubber magnets, plastic magnets, etc.

Magnets are divided into permanent magnets and soft magnets. The permanent magnet plus the strong magnet makes the spin of the magnetic material and the Angular momentum of the electron align in a fixed direction. Apply power to the soft magnet. This is also a way to increase magnetic force. If the current disappears, soft iron will gradually lose its magnetism.