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What is the demagnetization curve of square chart?

What is the demagnetization curve of square chart?
The demagnetization curve of permanent magnet square chart is an important indicator of magnetic properties. When the magnets are in dynamic conditions, external reverse magnetic field H or inside the magnet demagnetizing field HD showed cyclical changes, for sintered Nd-Fe-B magnets, B demagnetization curve is close to a straight line, magnet stability under dynamic conditions, the better.
It is worth noting that if magnet B demagnetization curve is not linear, magnet reply magnetic permeability Mu: in different working points have different values, here's how to put magnet design in the most stable state, it is very important.
The definition of the demagnetization curve of the magnet, the reverse magnetic field size is Hk, Hk/jHc can intuitively represent magnet demagnetization curve rectangularity. For Nd-Fe-B sintered magnets with high jHc, jHc is much larger than bHc. Hk/jHc is one of the important magnetic properties of permanent magnets, and also the characteristics of the magnets are also characterized.
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