What are the characteristics of a permanent magnet

　　With the development of society, people use a magnet to the probability has been greatly improved . From high-tech products to the most simple packaging magnetic , currently the most widely used magnets or NdFeB magnets, ferrite magnets and permanent magnets. What are the characteristics of the permanent magnet is it ?

　　Permanent magnet is under no applied magnetic field , can long maintain its magnetic objects . Permanent magnet ferromagnetic material used, such as iron , nickel, or the like. Refers to the permanent magnets are magnetic, and under natural conditions , the magnetic very stable , it 's not necessarily the actual ingredients contained iron.

　　Under normal circumstances, these minerals molecular arrangement confusion sectors influence each other to not show magnetic, but consistent trend in external magnetic fields, such as guided molecular orientation, they show magnetism. Iron, cobalt, nickel is the most commonly used magnetic material.

　　Basically magnet of permanent magnets and soft, so that the permanent magnet is coupled magnetic spin and electronic angular momentum of the magnetic material arranged in a fixed direction; Soft is combined with current, such as removing the current soft iron will slowly lose magnetic. Pure metallic state does not have a permanent magnetic iron, will be close to the permanent magnet to generate a magnetic induction. Adding other elements in the permanent magnet can be improved in terms of characteristics of a permanent magnet. Many other elements having a stronger magnetic, such as a strong magnet is much neodymium, iron and boron in the mixture .

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