How could we reduce the eddy-current losses in the disc?

Eddy-current losses - If the core is electrically conductive, the changing magnetic field induces circulating loops of current in it, called eddy currents, due to electromagnetic induction.

The material is a low carbon but high silicon iron with several times the resistivity of pure iron, further reducing eddy-current loss, and low coercivity to reduce hysteresis loss.

"Eddy-current losses in cylindrical conductors, with special applications to the alternating current resistances of short coils," Philosophical Transactions of the Royal Society of London, Series A, vol.