Briefly explain what permanent magnet is

　　Permanent magnet, can keep its magnetic objectslong with no magnetic field,. According to the difference of materials in general can be maintained for 10 years, the permanent magnet is available with ferromagnetic materials, such as iron, nickel and other made.

　　The atomic structure of the permanent magnet is special, atom itself has a magnetic moment. These mineral molecular arrangement of the general confusion, magnetic regions influence each other cannot appear the magnetic, but in the external forces such as magnetic guided molecular orientation consistency, it shows magnetic, also known as magnets, iron, cobalt, nickel is the most commonly used magnetic material. Basically the magnet consists of permanent magnet and soft magnetic, permanent magnet is coupled with strong magnetic to magnetic material and electronic spin angular momentum in a fixed direction; soft magnetic is coupled with the current, current removed, soft will slowly lose magnetism. Magnet is a generic term, refers to a magnetic, the actual component does not necessarily contain iron. Compared with the pure metal state of iron itself has no permanent magnetism, only close to the permanent magnet can induce permanent magnet magnetic, general with other impurities such as carbon addition to the magnetic stabilized, but it will make the free electron reduction and not conductive, so when the current through the lamp does not shine, iron is a common magnetic elements.

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