Fig. 6. ACS measurements of single core iron oxide nanoparticle samples T1 (d_c = 23 nm), T2 (d_c = 30 nm), and T3 (d_c = 36 nm) synthesized at three different temperatures (ΔT = 5 K). The straight lines denote the real part, and the dotted lines the imaginary part of the complex dynamic susceptibility.