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12 Nov 2007

Volume 91, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 91, 203501 (2007); http://dx.doi.org/10.1063/1.2806922 (3 pages)

Michael N. Feiginov and Dibakar Roy Chowdhury
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High-spin ferromagnetic state observed in the Fe–Nb alloys synthesized by ion beam mixing

K. P. Tai, T. L. Wang, and B. X. Liu

Appl. Phys. Lett. 91, 204101 (2007); http://dx.doi.org/10.1063/1.2811719 (3 pages) | Cited 1 time

Online Publication Date: 13 November 2007

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An fcc-structured Fe55Nb45 alloy with a large lattice constant of a ≈ 0.408 nm was synthesized by 200 keV xenon ion irradiation at a dose of 3×1015 Xe+/cm2. The Fe atom in Fe55Nb45 alloy presents a distinct magnetic moment as high as 2.41μB, confirming a high-spin ferromagnetic state of fcc Fe predicted by ab initio calculation. Further irradiation, i.e., at a dose of 5×1015 Xe+/cm2, induced phase separation, resulting in fractal growth consisting of Fe72Nb28 nanoclusters embedded in Fe35Nb65 matrix. The formation mechanism of alloy phases as well as fractal pattern was discussed in terms of the atomic collision theory.
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75.30.Cr Saturation moments and magnetic susceptibilities
75.50.Bb Fe and its alloys
75.50.Tt Fine-particle systems; nanocrystalline materials
61.46.Bc Structure of clusters (e.g., metcars; not fragments of crystals; free or loosely aggregated or loosely attached to a substrate)
61.80.Jh Ion radiation effects
61.82.Bg Metals and alloys

Marangoni flow on an inkjet nozzle plate

Jos de Jong, Hans Reinten, Herman Wijshoff, Marc van den Berg, Koos Delescen, Rini van Dongen, Frieder Mugele, Michel Versluis, and Detlef Lohse

Appl. Phys. Lett. 91, 204102 (2007); http://dx.doi.org/10.1063/1.2812473 (3 pages) | Cited 7 times

Online Publication Date: 15 November 2007

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In piezo inkjet printing, nozzle failures are often caused by an ink layer on the nozzle plate. It is experimentally shown that the ink layer at the nozzle is formed through streamers of ink, emanating from a central ink band on the nozzle plate. The streamers propagate over a wetting nanofilm of 13 nm thickness, directed toward the actuated nozzles. The motion of the front end of the streamers follows a power law in time with an exponent ½. The observations are consistent with a surface tension gradient driven flow. The origin of the Marangoni flow is an effective lower surfactant concentration of the ink around the nozzle.
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68.03.Cd Surface tension and related phenomena
68.08.Bc Wetting

Microstrip resonator for microwaves with controllable polarization

T. P. Mayer Alegre, A. C. Torrezan, and G. Medeiros-Ribeiro

Appl. Phys. Lett. 91, 204103 (2007); http://dx.doi.org/10.1063/1.2809372 (3 pages) | Cited 3 times

Online Publication Date: 16 November 2007

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In this work, the authors implemented a resonator based on microstrip cavities that permit the generation of microwaves with arbitrary polarization. Design, simulation, and implementation of the resonators were performed using standard printed circuit boards. The electric field distribution was mapped using a scanning probe cavity perturbation technique. Electron spin resonance using a standard marker was carried out in order to verify the polarization control from linear to circular.
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84.40.Az Waveguides, transmission lines, striplines

Molecular dynamics simulation of pore growth in lipid bilayer membranes in the presence of edge-active agents

Dorel Moldovan, Dinesh Pinisetty, and Ram V. Devireddy

Appl. Phys. Lett. 91, 204104 (2007); http://dx.doi.org/10.1063/1.2814876 (3 pages) | Cited 10 times

Online Publication Date: 16 November 2007

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Using molecular dynamics simulations, we investigated the mechanism of entropy-driven pore formation in a phospholipid bilayer in the presence of a line tension lowering agent. Even in the absence of an external stress, our simulations show that it is possible to observe with atomistic detail and on nanosecond time scale the nucleation and growth of hydrophilic pores. We rationalize the nucleation process in terms of a simplified free energy model that includes the entropy of the pore shape. By estimating the line tensions within the lipid bilayers with and without edge-active agents, our simulations corroborate the pore growth model.
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87.14.Cc Lipids
87.15.Cc Folding: thermodynamics, statistical mechanics, models, and pathways
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