Transport dynamics of superparamagnetic microbeads trapped by mobile magnetic domain walls
Name
Rapoport-2013-Transport dynamics of superparamagnetic.pdf
Size
2.51 MB
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Adobe PDF
Checksum (MD5)
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Author(s)
Rapoport, Elizabeth
Beach, Geoffrey Stephen
Date Issued
May 2013
Journal
Physical Review B
Publisher
American Physical Society
Citation
Rapoport, E., and G. S. D. Beach. “Transport Dynamics of Superparamagnetic Microbeads Trapped by Mobile Magnetic Domain Walls.” Phys. Rev. B 87, no. 17 (May 2013). © 2013 American Physical Society
Version
Final published version
Abstract
The dynamics of fluid-borne superparamagnetic bead transport by field-driven domain walls (DWs) in submicrometer ferromagnetic tracks is studied experimentally together with numerical and analytical modeling. A combination of micromagnetic modeling and numerical calculation is used to determine the strength of bead-DW interaction for a range of track geometries and bead sizes. The maximum DW velocity for continuous bead transport is predicted from these results and shown to be supported by experimental measurements. Enhancement of the maximum velocity by appropriate material selection or field application is demonstrated, and an analysis of the source of statistical variation is presented. Finally, the dynamics of bead-DW interaction and bead transport above the maximum DW velocity for continuous DW-mediated bead transport is characterized.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
http://dx.doi.org/10.1103/PhysRevB.87.174426
