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Fabrication of Nanoparticles and Microspheres with Uniform Magnetic Half-Shells

Published online by Cambridge University Press:  26 February 2011

Brandon H. McNaughton ,
Vladimir A. Stoica ,
Jeffrey N. Anker ,
Katherine M. Tyner ,
Roy Clarke  and
Raoul Kopelman
Brandon H. McNaughton
Affiliation:
bmcnaugh@umich.edu, University of Michigan, Applied Physics Program and Department of Chemistry
Vladimir A. Stoica
Affiliation:
vstoica@umich.edu, University of Michigan, Applied Physics Program
Jeffrey N. Anker
Affiliation:
janker@umich.edu, University of Michigan, Applied Physics Program and Department of Chemistry
Katherine M. Tyner
Affiliation:
kmtyner@umich.edu, University of Michigan, Toxicology Program
Roy Clarke
Affiliation:
royc@umich.edu, University of Michigan, Applied Physics Program
Raoul Kopelman
Affiliation:
kopelman@umich.edu, University of Michigan, Applied Physics Program and Department of Chemistry, United States
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Abstract

We report a method for fabricating, anisotropically designed, multiphasic nano-particles with uniform magnetic half-shells. Cobalt layers were deposited onto commercially made non-magnetic polystyrene nanospheres and microspheres, using ultrahigh vacuum vapor deposition, which produced particles with a half-shell of uniform size, shape and magnetic content. Iron was also deposited onto commercially made silica nanospheres and microspheres and was characterized using transmission electron microscopy and scanning electron microscopy. The coercivity of the magnetic material layers, on the substrate-supported spheres, was enhanced compared to the bulk values of such films without spheres. The particles, once removed from the substrate, were amenable to being rotated in solution, which could allow for more accurate physical and chemical measurements in a variety of fluidic environments. Applications for imaging local mechanical, magnetic and electrical environments are also delineated.

Keywords

ferromagneticnanostructurenanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 899: Symposium N – Dynamics in Small Confining Systems VIII , 2005 , 0899-N04-03
Copyright
Copyright © Materials Research Society 2006

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References

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