Fig. 5. Supraparticle reconfiguration by lowering field intensity.

(A) Brightfield micrographs of AB₆ supraparticle from state 1 to state 2 through five stages of reconfiguration. Decreasing the applied field intensity from 4000 to 500 A m⁻¹ allows relocation of two satellites from the nonmagnetic hemisphere to the iron patch. Scale bar, 5.0 μm. (B) Ensemble energy difference between state 1 and state 2 (ΔU) as a function of applied field intensity H. At 4000 A m⁻¹, the energy difference is ~50 kT and is reduced to ~1 kT at 700 A m⁻¹.