I want to find out the J-A parameters for an hard-magnetic material from the experimentally-obtained magnetic hysteresis curve.

I have found some open-source codes and similar tools: by proper tuning of the J-A parameters, one should be able to obtain the curve that they want. However, it seems like everything I have tried can not go past a certain coercive field value - every model seems suitable only for soft magnets.

Is there a way that I am missing to model hard magnets to find the J-A parameters of interest?

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