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Electron Holography of Ferromagnetic Nanoparticles Encapsulated in Three-Dimensional Arrays of Aligned Carbon Nanotubes

Published online by Cambridge University Press:  01 February 2011

Krzysztof K. Koziol ,
Takeshi Kasama ,
Rafal E. Dunin-Borkowski ,
Prabeer Barpanda  and
Alan H. Windle
Krzysztof K. Koziol
Affiliation:
kk292@cam.ac.uk, University of Cambridge, Department of Materials Science and Metallurgy, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom, +441223334335
Takeshi Kasama
Affiliation:
tk305@cam.ac.uk, Frontier Research System, The Institute of Physical and Chemical Research, Hatoyama, Saitama, 350-0395, Japan
Rafal E. Dunin-Borkowski
Affiliation:
red10@hermes.cam.ac.uk, University of Cambridge, Department of Materials Science and Metallurgy, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom
Prabeer Barpanda
Affiliation:
prabeer@eden.rutgers.edu, University of Cambridge, Department of Materials Science and Metallurgy, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom
Alan H. Windle
Affiliation:
ahw1@cam.ac.uk, University of Cambridge, Department of Materials Science and Metallurgy, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom
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Abstract

Closely-spaced ferromagnetic nanoparticles are of interest for applications that include data storage, magnetic imaging and drug delivery. Here, we use off-axis electron holography and micromagnetic simulations to study the magnetic properties of iron nanoparticles encapsulated in three-dimensional arrays of carbon nanotubes. The nanotubes constrain the shapes, sizes and separations of the nanoparticles, as well protecting them from oxidation. We record magnetic induction maps from individual particles that each contain a single magnetic domain. We also discuss the use of electron holography to assess magnetostatic interactions between adjacent particles.

Keywords

holographynanoscalemagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 962: Symposium P – Nanoscale Magnets – Synthesis, Self-Assembly, Properties and Applications , 2006 , 0962-P13-03
Copyright
Copyright © Materials Research Society 2007

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References

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