ferromagnetic material
ferromagnetic material
A material that consists of atoms having magnetic moments, which align parallel to each other, thus exhibits strong spontaneous magnetic polarizations without any external magnetic field. In a magnetic domain, all the magnetic moments take the same direction. When an external magnetic field is applied to a ferromagnetic material, strong magnetic moments appear in the direction of the magnetic field, and residual magnetic moments exist even after the magnetic field is removed, thus exhibiting a hysteresis loop of the magnetic moment against the magnetic field. Certain materials show ferromagnetism below a phase transformation temperature, called the Curie temperature Tc, and are paramagnetic (disordering of the moments) above the temperature.
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