The magnetized magnet in saturation magnetization is reverse magnetized when the magnetization is reversed, and the value of the reverse magnetic field strength required to reduce the magnetic induction to zero is called the magnetic induction coercive force (Hcb). However, at this time, the magnetization of the magnet is not zero, but the applied reverse magnetic field and the magnetization of the magnet cancel each other out. (The external magnetic induction intensity is zero) If the external magnetic field is cancelled at this time, the magnet still has certain magnetic properties. The coercive force of NdFeB is generally above 11000Oe.
　　A magnet is magnetized by an external magnetic field in a closed circuit environment until the technology is saturated, and then the external magnetic field is cancelled. At this time, the magnetic induction strength of the magnet is called residual magnetism. It represents the maximum flux value that the magnet can provide. It can be seen from the demagnetization curve that it corresponds to the situation when the air gap is zero, so the magnetic induction intensity of the magnet in the actual magnetic circuit is less than the remanence. NdFeB is the highest practical permanent magnet material found in Br today.

　　Powerful magnets to reduce the magnetization of the magnet to zero to apply the reverse magnetic field strength, we call it the intrinsic coercive force. The intrinsic coercive force is a physical quantity that measures the resistance of the magnet to demagnetization. If the applied magnetic field is equal to the intrinsic coercive force of the magnet, the magnetism of the magnet will be basically eliminated. The Hcj of NdFeB will decrease with the increase of temperature, so you should choose the brand of high Hcj when you need to work in high temperature environment.
　　The above is the performance curve of strong magnets, if you have a demand for strong magnet products, please contact Ningbo Prime Tech Magnet Co., Ltd