Nonlinear dynamics of superparamagnetic beads in a traveling magnetic-field wave.

Journal Article (Journal Article)

The nonlinear dynamic behavior of superparamagnetic beads exposed to a periodic array of micromagnets and an external rotating field is simulated as a function of the relative size of the bead with respect to the micromagnet size and the strength of the external field relative to the pole density of the substrate. For large bead sizes, it is confirmed that the motion of the beads corresponds to the dynamics of an overdamped nonlinear harmonic oscillator. For lower bead sizes, additional subharmonic locking effects are observed along with the emergence of bounded orbits. These results qualitatively support previous experimental investigations of traveling-wave magnetophoresis and provide guidelines for achieving nearly infinite separation resolution between differently sized beads.

Full Text

Duke Authors

Cited Authors

  • Yellen, BB; Virgin, LN

Published Date

  • July 6, 2009

Published In

Volume / Issue

  • 80 / 1 Pt 1

Start / End Page

  • 011402 -

PubMed ID

  • 19658704

Electronic International Standard Serial Number (EISSN)

  • 1550-2376

International Standard Serial Number (ISSN)

  • 1539-3755

Digital Object Identifier (DOI)

  • 10.1103/physreve.80.011402


  • eng