Magnetic microchains and microswimmers in an oscillating magnetic field

Yasushi Ido, Yan Hom Li*, Hiroaki Tsutsumi, Hirotaka Sumiyoshi, Ching-Yao Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Superparamagnetic micro-bead chains and microswimmers under the influence of an oscillating magnetic field are studied experimentally and numerically. The numerical scheme composed of the lattice Boltzmann method, immersed boundary method, and discrete particle method based on the simplified Stokesian dynamics is applied to thoroughly understand the interaction between the micro-bead chain (or swimmer), the oscillating magnetic field, and the hydrodynamics drag. The systematic experiments and simulations demonstrated the behaviors of the microchains and microswimmers as well as the propulsive efficiencies of the swimmers. The effects of key parameters, such as field strengths, frequency, and the lengths of swimmer, are thoroughly analyzed. The numerical results are compared with the experiments and show good qualitative agreements. Our results proposed an efficient method to predict the motions of the reversible magnetic microdevices which may have extremely valuable applications in biotechnology.

Original languageEnglish
Article number011902
Issue number1
StatePublished - 1 Jan 2016


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