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QUESTIONS AND ANSWERS
 
Question 788

Please explain the concepts of magnetism pertaining to ferromagnetism, diamagnetism, and paramagnetism. - SC
A ferromagnetic material is one that contains intrinsic magnetic order. Iron, for example, is a ferromagnetic material—meaning that if you were to examine a microscopic region of the iron, you would find that it was highly magnetic. The magnetism in a ferromagnetic material is often hidden by a domain structure, in which microscopic magnetic regions or "domains" all point in random directions to give the material no apparent magnetism. Only when you expose the ferromagnetic material to a magnetic field does its magnetic character suddenly reveal itself. A ferromagnetic material becomes strongly magnetic when it's exposed to a magnetic field.

A diamagnetic material is one in which the electrons begin moving when it's place in a magnetic field. These moving electric charges create a second magnetic field that partially cancels the original field. A diamagnetic magnetic field partially shields itself from magnetism when it's exposed to a magnetic field.

A paramagnetic material is one in which individual magnetic electrons respond magnetically to any external magnetic field. It becomes weakly magnetic when it's exposed to a magnetic field. Unlike a ferromagnetic material, a paramagnetic material has no intrinsic magnetic order before it's exposed to an external field.

         

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