Fig. 4From: The Boundary Between Volume and Surface-Driven Magnetic Properties in Spinel Iron Oxide Nanoparticlesa Low-field details of the ΔM-plots at 5 K. The full range of the measurements is reported in the inset. b The dipolar interaction energy and c the ΔM-plots peaks’ intensity is plotted as a function of the average particle’s volume, with lines used as a guide to the eyeBack to article page