A magnetic roll having a rotation axis, the magnetic roll including an axial series of segmented rings, each of the rings' segments incorporating a permanent having an outer end, an inner end, an axial end, an oppositely axial end, a circumferential end, a counter-circumferential end, a north pole positioned at the inner or outer end, and a south pole positioned oppositely from the north pole; a bonding matrix rigidly interconnecting the rings; and a magnetic armature operatively spanning between the permanent magnets' inner ends.