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. 2016 Nov 22;7:13519. doi: 10.1038/ncomms13519

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(a,d) Acting forces in a chain of N=3 and N=4 microswimmers. The arrows indicate direction and magnitude of all acting forces: self-propulsion force (white), force due to magnetic dipole–dipole interaction (red) and the basic HI due to the Stokeslet (purple). In case of pushers, the extensile flow leads to an repulsion (cyan) and in case of pullers the contractile flow leads to an attraction (orange arrows). Resulting flow field for a linear chain of (b) N=3 and (e) N=4 pushers as well as for (c) N=3 and (f) N=4 pullers using the same colour coding as in Fig. 1b.