Trajectory shift of magnetic microchains in an oscillating field

Yan Hom Li, He Ching Lin, Ching-Yao Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We report an interesting phenomenon of "trajectory shift" of magnetic chains in an oscillating field, when the phase angle lags of chains to the external field exceeding 90. The phenomenon shifts the oscillating trajectory of chain along a new axis, which is perpendicular to its original axis. Applicability of the phenomenon to a stable chain in various conditions is experimented systematically. The trajectory shift provides an effective manipulating mechanism in micro-electro-mechanical-systems, such as steering of micro-swimmers. We successfully demonstrate that the driven direction of a micro-swimmer can be controlled by shifting its oscillating trajectory without a physical re-configuration of the external field.

Original languageEnglish
Pages (from-to)831-838
Number of pages8
JournalMicrofluidics and Nanofluidics
Issue number5
StatePublished - May 2013


  • Magnetic particle
  • Micro-chain
  • Micro-swimmer
  • Steering mechanism
  • Trajectory shift


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