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Fig. 3 Magnetic actuation of ZFO micromotors. A) The schematic diagram of the relationship between the chain and the external magnetic field. B) Self-assembly of ZFO (10 µg mL−1) under the rotational magnetic field (2 mT) with a rotational speed of 100 r min−1. C) Trajectory of the rotational motion of ZFO micromotors (10 µg mL−1) in the rotational magnetic field (2 mT) with the rotation speed of 100 r min−1. D) The trajectory of the chain-breaking process of ZFO micromotors (10 µg mL−1) under the rotational magnetic field (2 mT) with the speed of 120 r min−1. E–G) The images of ZFO micromotors in 5% glucose solution at the concentration of 10 µg mL−1 under the rotational magnetic field (2 mT) for 10 min with the rotation speed of 100, 120, and 200 r min−1. H) Length distribution histogram of ZFO chain (10 µg mL−1) under the rotational magnetic field (2 mT) for 10 min at different rotational speeds (y axis: 100, 120, and 200 r min−1). Scale bar: 20 µm.