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. 2017 Feb 15;3(2):e1601469. doi: 10.1126/sciadv.1601469

Fig. 1. Schematics of the experiment and particle trajectories.

Fig. 1

(A) Schematics of the experiment. A nonsmooth ferromagnetic particle with the magnetic moment μ is energized by an applied vertical ac magnetic field. Particle rotation leads to a self-propelled motion with the velocity V. (B) Trajectories of 25 particles observed over 100 periods of the ac magnetic field. Some particles escape the center of the lens, whereas other particles remain near the center of the lens most of the time. Scale bar, 1 mm.