Fig. 3
From: Interaction Effects in Assembly of Magnetic Nanoparticles
(a) Evolution of the hysteresis loops of dilute assembly of clusters of iron oxide nanoparticles with diameter D = 20 nm for various ratios D av /D: (1) D av /D = 1.46; (2) D av /D = 2.92; (3) D av /D = 5.84. Hysteresis loop 4 corresponds to assembly of non-interacting nanoparticles of the same diameter. It is calculated by means of Eqs. (1) and (2). (b) SAR as a function of the average nanoparticle diameter D for dilute assemblies of clusters of nanoparticles with different packing density η