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Publication Detail
The electromagnetic properties of nanoparticle colloids at radio and microwave frequencies
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Hussain S, Youngs IJ, Ford IJ
  • Publisher:
    IOP PUBLISHING LTD
  • Publication date:
    07/09/2007
  • Pagination:
    5331, 5337
  • Journal:
    J PHYS D APPL PHYS
  • Volume:
    40
  • Issue:
    17
  • Print ISSN:
    0022-3727
  • Language:
    EN
  • Keywords:
    DIELECTRIC-PROPERTIES, PARTICLES
  • Addresses:
    QinetiQ Ltd
    Energy & Mat Dept
    Farnborough
    GU14 0LX
    Hamp
    England

    DSTL
    Dept Phys Sci
    Salisbury
    SP4 0JQ
    Wilts
    England

    UCL
    Dept Phys & Astron
    London
    WC1E 6BT
    England
Abstract
The aim of this study is to investigate the electromagnetic properties of nanoparticle colloids in the frequency range 1 MHz - 20 GHz, with focus on the electromagnetic absorption mechanisms at microwave frequencies. A broad range of magnetic and dielectric properties are investigated and a number of mechanisms are highlighted for tailoring the electromagnetic performance. Results from the Co (x) Ni1- x series, with particle sizes ranging from 25 to 200 nm, show particle size- related dielectric and magnetic properties, which aid the optimization of the resulting properties, in addition to conventional mechanisms, which are also demonstrated in colloidal form. A further reduction in particle size to below 20 nm leads to single magnetic domain particles, which also exhibit enhanced electromagnetic properties, as demonstrated with broadband magnetic performance achieved for Co ferrofluid with an average particle size of 5 nm.
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