Magnetization
= Magnetization
{title2=$\mathbf M$}
{wiki}
Magnetization is magnetic dipole moment per unit volume. It produces bound volume and surface currents
$$
\mathbf J_{\rm b}=\nabla\times\mathbf M,
\qquad
\mathbf K_{\rm b}=\mathbf M\times\mathbf n.
$$
Across an interface, the net bound sheet current is $(\mathbf M_1-\mathbf M_2)\times\mathbf n$.