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# Coercivity and intrinsic coercivity of NdFeB

There are two very important parameters coercive force and intrinsic coercive force in the performance parameters of NdFeB permanent magnet materials.

## How to understand coercivity and intrinsic coercivity?

Coercivity
Popular understanding: the magnetized neodymium iron boron magnet, the force required to reduce its magnetic force to zero is the coercive force. Expressed by Hcd.
Professional analysis: Coercivity refers to the magnetic field strength required to reduce the magnetization to zero after the magnetic material has been magnetized to magnetic saturation.
Intrinsic coercive force: The strength of the reverse magnetic field required to reduce the residual magnetization Mr of the magnet to zero, which we call the intrinsic coercive force.
When the reverse magnetic field H=Hcb, although the magnetic induction intensity B of the magnet is 0, the magnet does not display magnetic flux to the outside, but the vector sum of the microscopic magnetic dipole moment inside the magnet is often not 0, which means that the magnet’s The magnetic polarization intensity J tends to maintain a large value in the original direction. Therefore, Hcb is not enough to characterize the intrinsic magnetic characteristics of the magnet; when the reverse magnetic field H increases to a certain value Hcj, the vector sum of the microscopic magnetic dipole moment inside the magnet is 0, and the reverse magnetic field H is called The intrinsic coercivity of the material Hcj.
The unit of coercivity and intrinsic coercivity: the unit is A/m (international standard system) or Oe (gauss unit system).
Coercive force represents the ability of a magnetic material to resist demagnetization. The anti-demagnetization pair is anti-demagnetization. Why does it always prompt anti-demagnetization? This is its main function.