How can the scholars definite the concept of magnet’s materal?

　　Basically, a ferromagnetic this concept includes any magnetic material in the absence of an external magnetic field. Now some people still use this concept. But according to a deeper understanding of the different display of magnetic material and magnetic property, scholars have done a more precise definition of this concept.

　　A matter of primary cell of all the magnetic ions that is pointing to its magnetic orientation is known to be a ferromagnetic. If only part of the ion's magnetic field points to the magnetic direction, then it is called ferrimagnetism. If the magnetic ion direction just cancelling each other is called a magnetic.

　　The magnetic phenomena of the material there exists a critical temperature, and will occur at this temperature. This temperature is called the Curie temperature for ferromagnetic and ferromagnetic. This temperature is called the Neel temperature for antiferromagnetic substances. Some people think that the attraction between the permanent magnets and the ferromagnetic material is the earliest human understanding to magnet.

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