Energy Harvester using a vibration generator and magnets

For a thesis paper my group member and I are going harvest energy using a vibration generator and magnets. we are using COMSOL to virtually recreate the system. so far we've been able to make the housing and place the 2 fixed magnets on either ends, a coil, 1 variable magnet.

we are having some problems with fixing the material of the magnet. is there a recent update of the magnetic material list of the material browser.

Is there any way to write the coercive force equation in COMSOL, or if possible can we use MATLAB and export it into COMSOL?

this is the first time we are dealing with a software of this magnitude, so any help will be appreciated. thank you.