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(a) Photos of microswimmers of various lengths collected from chains of microparticles in a magnetic field. Reproduced from [83]. CC BY 4.0. (b) Three-stage formation of micro- and nanoswimmers based on iron oxide nanoparticles. (c) Design and manufacturing steps of magnetic microdimer swimmers and an optical image of Janus microdimers after magnetization. Reproduced from [85]. CC BY 4.0.
