So if ceramics have bismuth or strontium carbonates then you have a dimagnetic in direct interaction with the ferromagnetic ferrous/ferric oxide. Interesting I would think that this would create huge problems inside the magnet itself as the two forces would shear it but if the fields are aligned in such a manner during the sintering process you have huge huge flux from the ceramic material. Has BPK thought of using a neodymium or other rare earth magnet in experimentation? I have no idea what size or shape you could use considering the field created by Nd could probably interfere with string vibrations, maybe tiny amounts of Nd in a ceramic material or something like that could work. I was a Nuclear Engineering and Physics major in college and these things just intrigue me, you get to see a 20+ Tesla magnet at the Francis Bitter lab where you have class about quantum physics and your interest gets piqued. Enough propeller head talk, you guys make awesome pick ups that is all. :D