Strong Magnet Performance Curve, Demagnetization of Permanent Magnets, Demagnetization curves for a Nd-Fe-B

The value of the reverse magnetic field strength required to reduce the magnetic induction to zero when the magnet is magnetized by reverse magnetization in the reverse magnetization is called the magnetic coercive force (Hcb). However, the magnetization of the magnet is not zero at this time, but the applied reverse magnetic field and the magnetization of the magnet cancel each other out. (The external magnetic induction performance is zero.) At this time, if the external magnetic field is removed, the magnet still has a certain magnetic property. The coercive force of NdFeB is generally above 11,000 Oe.

Strong Magnet Performance Curve

Strong Magnet Performance Curve

A magnet is magnetized by an external magnetic field in a closed circuit environment to cancel the external magnetic field after the technology is saturated. At this time, the magnetic induction intensity exhibited by the magnet is called remanence. It represents the maximum flux value that the magnet can provide. It can be seen from the demagnetization curve that it corresponds to the case where the air gap is zero, so the magnetic induction intensity of the magnet in the actual magnetic circuit is smaller than the remanence. NdFeB is the highest practical permanent magnet material found in Br today.

demag curves of magnet

demag curves of magnet

A strong magnet reduces the magnetization of the magnet to zero. The reverse magnetic field strength that is required to be applied is called the intrinsic coercivity. The intrinsic coercivity is a physical quantity that measures the anti-demagnetization ability of a magnet. If the applied magnetic field is equal to the intrinsic coercivity of the magnet, the magnetism of the magnet will be substantially eliminated. The Hcj of NdFeB will decrease with increasing temperature, so you should choose a high Hcj grade when you need to work in a high temperature environment.

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