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Journal of Applied Physics / Volume 107 / Issue 9 / PROCEEDINGS OF THE 11TH JOINT MMM-INTERMAG CONFERENCE, WASHINGTON, DC, 2010 / Biomagnetism, Biosensing, and Biological Applications

J. Appl. Phys. 107, 09B301 (2010); http://dx.doi.org/10.1063/1.3352579 (5 pages)

Magnetic nanostructures for the manipulation of individual nanoscale particles in liquid environments (invited)

P. Vavassori1,2, M. Gobbi1, M. Donolato3, M. Cantoni3, R. Bertacco3, V. Metlushko4, and B. Ilic5

1CIC NanoGUNE Consolider, Donostia-San Sebastian 20018, Spain
2CNR-INFM S3, CNISM and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, Italy
3Dipartimento di Fisica Politecnico di Milano, LNESS, Via Anzani 42, 22100 Como, Italy
4Department of Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
5Cornell Nanofabrication Facility, Cornell University, Ithaca, New York 14853, USA

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(Received 28 October 2009; accepted 18 November 2009; published online 19 April 2010)

The manipulation of geometrically constrained magnetic domain walls (DWs) in nanoscale magnetic strips attracted much interest recently, with proposals for prospective memory and logic devices. Here we demonstrate that the high controllability of the motion of geometrically constrained DWs allows for the manipulation of individual nanoparticles in solution on a chip with the active control of position at the nanometer scale. Our approach exploits the fact that magnetic nanoparticles in suspension can be captured by a DW, whose position can be manipulated with nanometer scale accuracy in specifically designed magnetic nanowire structures. We hereby show that the precise control over DW nucleation, displacement, and annihilation processes in such nanostructures allows for the capture, transport, and release of magnetic nanoparticles. As magnetic nanoparticles with functionalized surfaces are widely used as molecule carriers or labels for single molecule studies, cell manipulation, and biomagnetic sensing, the accurate control over the handling of the single magnetic nanoparticle in suspension is a crucial building block for several applications in biotechnology, nanochemistry, and nanomedicine.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

magnetic domain walls, magnetic particles, nanoparticles, particle traps, soft magnetic materials

PACS

  • 75.75.Fk

    Domain structures in nanoparticles

  • 75.50.Tt

    Fine-particle systems; nanocrystalline materials

  • 75.60.Ch

    Domain walls and domain structure

  • 75.70.Kw

    Domain structure (including magnetic bubbles and vortices)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3352579

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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