Magnet: Generally defined as an object that can attract iron, cobalt, nickel, and other substances.
Magnets are generally divided into permanent magnets and soft magnets.
Permanent magnet: A magnet that can maintain its magnetism for a long period of time. A permanent magnet is a hard magnet that is not easily magnetized and is not easily magnetized.
Soft magnets: Most of the materials for the magnets and electromagnets, the polarity of the soft magnets varies with the polarity of the applied magnetic field.
