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The effect of trapping superparamagnetic beads on domain wall motion

Bryan, M.T., Dean, J., Schrefl, T., Thompson, F.E., Haycock, J. and Allwood, D.A. (2010) The effect of trapping superparamagnetic beads on domain wall motion. Applied Physics Letters, 96 (19). Art no.192503. ISSN 0003-6951

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Domain walls may act as localized field sources to trap and move superparamagnetic beads for manipulating biological cells and DNA. The interaction between beads of various diameters and a wall is investigated using a combination of micromagnetic and analytical models. Domain walls can transport beads under applied magnetic fields but the mutual attraction between the bead and wall causes drag forces affecting the bead to couple into the wall motion. Therefore, the interaction with the bead causes a fundamental change in the domain wall dynamics, reducing the wall mobility by five orders of magnitude. (C) 2010 American Institute of Physics. [doi:10.1063/1.3428775]

Item Type: Article
Copyright, Publisher and Additional Information: © 2010 American Institute of Physics. This is an author produced version of a paper subsequently published in Applied Physics Letters. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: biomagnetism; cellular biophysics; DNA; magnetic domain walls; micromagnetics; molecular biophysics; superparamagnetism
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 16 Jun 2010 13:04
Last Modified: 08 Feb 2013 17:00
Published Version: http://dx.doi.org/10.1063/1.3428775
Status: Published
Publisher: American Institute of Physics
Refereed: Yes
Identification Number: 10.1063/1.3428775
URI: http://eprints.whiterose.ac.uk/id/eprint/10897

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