Fig. 2. Colloidal clusters and effect of particle bulk ratio τ.

(A) 2D hexagonal arrangement of supraparticles. Scale bar, 25 μm. (B) Classification of colloidal clusters: From top to bottom, the number of satellites increases as supraparticles vary from AB to AB₄; from left to right, the fraction of satellites on the nonmagnetic hemisphere increases corresponding to isomers X, Y, and Z. (C) With increasing τ, the frequency of assembly of smaller clusters decreases in favor of larger supraparticles. All experiments were performed at H = 2500 A m⁻¹.