Powerful magnet has four points, the main characteristic of the concrete is mainly manifested in the following, below small make up take you to the specific understanding of understanding.
1, there is a certain 'conflict between each domain block after removing the magnetic domain in external magnetic field from the beginning arrange degaussing status back to the original disorder, so even get rid of the external magnetic field, ferromagnetic quality still save some.
And paramagnetic material is removed when the external magnetic field, the magnetization immediately goes to zero.
Relation between magnetic intensity and magnetic field intensity is not linear, namely the magnetic susceptibility and permeability is not constant, and the magnetic susceptibility and permeability of paramagnetic in temperature is constant.
2, more easily under the effect of outer magnetic field to magnetic and magnetic intensity at the moment no longer with the external magnetic field to add and add, and usually paramagnetic material is hard to reach the magnetic full.
3, the external magnetic field changes, the change in magnetization lags the change of the external magnetic field, the scene is called hysteresis effect.
Indicate the hysteresis effect, the ferromagnetic magnetization process contains obvious irreversible process.
When outside magnetic field is removed, ferromagnetic still save some magnetism, the magnetic intensity is zero, known as the residual magnetism, this is because of the ferromagnetic doping and other factors are 4, there exists a critical temperature TC, when iron gas products in above TC, the ferromagnetic, ferromagnetic transition ChengShun magnet, TC is called the Curie temperature or Curie point.
Near the Curie temperature, magnetic conductivity and specific heat disorders added.
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