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. 2015 Nov 5;5:16035. doi: 10.1038/srep16035

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(a) Sketch of the magnetocapillary system. Soft ferromagnetic particles are self-assembling at the water-air interface in a Petri dish. A vertical and constant magnetic field B_z is applied through the system. An oscillating horizontal field B_x excites the motion of the self-assembled structure. (b) A top view of the interface emphasizes the self-assembly of D = 500μm beads in a vertical field: capillary attraction is counterbalanced by dipole-dipole repulsion. The deformation of the liquid-air interface is evidenced by placing an array of pixels underneath the Petri dish. (c) Five snapshots of the beads over one period T of the forcing oscillation. The traces of the initial positions are drawn in yellow for emphasizing the motion of the structure. One should notice the rotational oscillation of the structure during the period.