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Inspired by the natural design of bacterial flagella, we report artificial bacterial flagella ͑ABF͒ that have a comparable shape and size to their organic counterparts and can swim in a controllable fashion using weak applied magnetic fields. The helical swimmer consists of a helical tail resembling the dimensions of a natural flagellum and a thin soft-magnetic "head" on one end. The swimming locomotion of ABF is precisely controlled by three orthogonal electromagnetic coil pairs. Microspheredoi:10.1063/1.3079655 fatcat:6tvdkteanbbk7oa3y4qdvssiya