Do you know about the diamagnetism, paramagnetic and Ferromagnetic?

　　The diamagnetism is certain categories of substances, when in an external magnetic field, the magnetic field will produce a weak repulsive force of a magnetic phenomenon.

　　Paramagnetic refers to a material's magnetic state. Some material may be subject to the influence of external magnetic field, resulting in the characteristic pointing to the same magnetization vector. This material has a positive susceptibility. Paramagnetic opposite phenomenon is known as diamagnetism.

　　Ferromagnetic is the magnetic state of a material, and has a spontaneous magnetization phenomenon. The most widely known is iron material. Some of the material is magnetized in an influence of the external magnetic field, even when an external magnetic field disappears, and it can still maintain its magnetic state and has a magnetic. It is the so-called spontaneous magnetization phenomenon. All of the permanent magnets have a ferromagnetic or ferromagnetic.

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