Figure 1.

Volume magnetization M of Dynal M280 superparamagnetic beads and 3% silicon steel as a function of applied field B. The volume magnetization of the beads was computed from the mass fraction of iron in the beads (0.12) and the measured mass magnetization (Ref. ¹). The Si-steel data were calculated from B–H data in the Handbook of Chemistry and Physics (Ref. ³).