We demonstrate experimentally and in computer simulations that magnetic microfloaters can self-organize into various functional structures while energized by an external alternating (ac) magnetic field. The structures exhibit self-propelled motion and an ability to carry a cargo along a pre-defined path. The morphology of the self-assembled swimmers is controlled by the frequency and amplitude of the magnetic field.
Kokot, Gašper, German V. Kolmakov, Igor S. Aranson, and Alexey Snezhko. "Dynamic self-assembly and self-organized transport of magnetic micro-swimmers." Scientific Reports 7, no. 1 (2017): 14726.