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19 Nov 2007

Volume 91, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 91, 212501 (2007); http://dx.doi.org/10.1063/1.2813047 (3 pages)

M. V. Milošević, G. R. Berdiyorov, and F. M. Peeters
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Structural and magnetic properties of nanocrystalline RuCo alloys

S. B. Qadri, T. M. Keller, M. Laskoski, C. A. Little, M. S. Osofsky, and H. R. Khan

Appl. Phys. Lett. 91, 214101 (2007); http://dx.doi.org/10.1063/1.2814061 (3 pages) | Cited 1 time

Online Publication Date: 20 November 2007

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Nanoparticles of Ru1−xCox (0 ⩽ x ⩽ 1) in the carbon matrix were synthesized over the entire compositional range using organometallic precursors. For Co concentrations with x ⩽ 0.75, a hexagonal close packed phase was formed, whereas a face centered cubic phase was observed for x>0.75. The crystallite sizes varied between 5 and 10 nm. In addition, multiwalled carbon nanotubes formed during the pyrolysis of the precursors. Increasing ferromagnetic order was observed with increasing Co concentration.
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61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.16.Be Chemical synthesis methods
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Experimental verification of backward wave propagation at photonic crystal surfaces

S. Foteinopoulou, G. Kenanakis, N. Katsarakis, I. Tsiapa, M. Kafesaki, E. N. Economou, and C. M. Soukoulis

Appl. Phys. Lett. 91, 214102 (2007); http://dx.doi.org/10.1063/1.2814154 (3 pages) | Cited 5 times

Online Publication Date: 20 November 2007

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Backward wave propagation is the true manifestation of left-handed electromagnetism and not negative refraction which occurs also at the interface of right-handed systems. Here we experimentally demonstrate in a direct fashion the backward wave propagation phenomenon, which takes place at the surface of a properly designed photonic crystal. Our microwave experiment could open other venues for the verification of left-handed behavior in optical metamaterials.
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42.70.Qs Photonic bandgap materials
78.68.+m Optical properties of surfaces

Tensile deformation accommodation in microscopic metallic glasses via subnanocluster reconstructions

Ch. E. Lekka, A. Ibenskas, A. R. Yavari, and G. A. Evangelakis

Appl. Phys. Lett. 91, 214103 (2007); http://dx.doi.org/10.1063/1.2816912 (3 pages) | Cited 37 times

Online Publication Date: 21 November 2007

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We present results on the structure and the atomistic mechanisms for tensile deformation accommodation of the Cu46Zr54 microscopic metallic glass. At equilibrium, 23% of the atoms belong to tiny Cu-centered icosahedral clusters (Cu-ICO) and approximately 41% Zr centered slightly larger ICO-like clusters. Under deformation, the number of Cu-ICOs remains dynamically constant until yielding through a continuous cluster destruction-recreation process. Plastic deformation occurs homogeneously and is locally accommodated through the formation of rhombic dodecahedral clusters with significant ( ∼ 2%) atomic density drop. These findings explain very recent experimental results demonstrating the fundamental differences of plastic deformation mechanisms between bulk metallic and microscopic glasses.
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81.40.Lm Deformation, plasticity, and creep
61.43.Fs Glasses
61.44.Br Quasicrystals
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