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24 Nov 2008

Volume 93, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 93, 214101 (2008); http://dx.doi.org/10.1063/1.3025819 (3 pages)

Brian Abbey, Garth J. Williams, Mark A. Pfeifer, Jesse N. Clark, Corey T. Putkunz, Angela Torrance, Ian McNulty, T. M. Levin, Andrew G. Peele, and Keith A Nugent
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Quantitative coherent diffractive imaging of an integrated circuit at a spatial resolution of 20 nm

Brian Abbey, Garth J. Williams, Mark A. Pfeifer, Jesse N. Clark, Corey T. Putkunz, Angela Torrance, Ian McNulty, T. M. Levin, Andrew G. Peele, and Keith A Nugent

Appl. Phys. Lett. 93, 214101 (2008); http://dx.doi.org/10.1063/1.3025819 (3 pages) | Cited 19 times

Online Publication Date: 24 November 2008

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The complex transmission function of an integrated circuit is reconstructed at 20 nm spatial resolution using coherent diffractive imaging. A quantitative map is made of the exit surface wave emerging from void defects within the circuit interconnect. Assuming a known index of refraction for the substrate allows the volume of these voids to be estimated from the phase retardation in this region. Sample scanning and tomography of extended objects using coherent diffractive imaging is demonstrated.
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85.30.De Semiconductor-device characterization, design, and modeling

Dynamic colloidal sorting on a magnetic bubble lattice

Pietro Tierno, Alejandro Soba, Tom H. Johansen, and Francesc Sagués

Appl. Phys. Lett. 93, 214102 (2008); http://dx.doi.org/10.1063/1.3029740 (3 pages) | Cited 6 times

Online Publication Date: 24 November 2008

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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 field which precesses around an axis normal to the film with a frequency Ω = 62.8 s−1 and intensity 3120 A/m <H<6911 A/m. By varying the component of the field Hz normal to the film, we observe that particles of one size are localized around magnetic bubbles while the others are transported through the array. We complement the experimental measurements with numerical simulations to explore the sorting capability for particles with different magnetic moments.
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75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Mm Magnetic liquids
75.40.Mg Numerical simulation studies
75.20.-g Diamagnetism, paramagnetism, and superparamagnetism
75.30.Cr Saturation moments and magnetic susceptibilities
82.70.Dd Colloids
75.50.Gg Ferrimagnetics
75.70.Kw Domain structure (including magnetic bubbles and vortices)

Microwave absorption in percolating metal-insulator composites

D. T. Zimmerman, J. D. Cardellino, K. T. Cravener, K. R. Feather, N. M. Miskovsky, and G. J. Weisel

Appl. Phys. Lett. 93, 214103 (2008); http://dx.doi.org/10.1063/1.3036900 (3 pages) | Cited 7 times

Online Publication Date: 25 November 2008

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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.
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71.30.+h Metal-insulator transitions and other electronic transitions
77.84.Lf Composite materials
64.60.ah Percolation
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