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Dynamic colloidal sorting on a magnetic bubble lattice
We use a uniaxial garnet film with a magnetic bubble lattice to sort paramagnetic colloidal particles with different diameters, i.e., 1.0 and 2.8  µm. We apply an external magnetic fie...

Microwave absorption in percolating metal-insulator composites

Appl. Phys. Lett. 93, 214103 (2008); doi:10.1063/1.3036900

Published 25 November 2008

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D. T. Zimmerman, J. D. Cardellino, K. T. Cravener, K. R. Feather, N. M. Miskovsky, and G. J. Weisel
The Pennsylvania State University, Altoona College, 3000 Ivyside Park Altoona, Pennsylvania 16601, USA
We measure several electromagnetic properties of tungsten-Teflon composites as a function of metal volume concentration. The electric (E) and magnetic (H) loss tangents at 2.45  GHz and the dc conductivity each exhibits a percolation transition at a different critical value of the metal volume fraction p. Moreover, the transition behavior depends on the average particle size and size distribution of the metal component. We explain the variation in each case by a schematic model derived from established percolation theory and the distinct response of conducting particles to microwave electric and magnetic fields. ©2008 American Institute of Physics
History: Received 17 October 2008; accepted 6 November 2008; published 25 November 2008
Permalink: http://link.aip.org/link/?APPLAB/93/214103/1
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KEYWORDS and PACS

Keywords
PACS
  • 71.30.+h
    Metal-insulator transitions and other electronic transitions
  • 77.84.Lf
    Dielectric, piezoelectric, and ferroelectric composite materials
  • 64.60.ah
    Percolation studies of phase transitions
  • YEAR: 2008

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ISSN:
0003-6951 (print)   1077-3118 (online)
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