Difference between hard and soft magnetic

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Magnetic material is classified into soft magnets and hard magnets, Hard magnets are also called permanent, what means that a strong external magnetic field is required to reduce its magnetization to zero, whereas soft magnets, have easy reversible magnetism.

The use of magnetic materials will depend on the purpose of application. A refrigerator magnet, for example, must be made of hard magnet to stay attached a long time. On the other hand, electric motors require soft magnetic to quickly adapt to changes of alternating electric field