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23 Jun 2008

Volume 92, Issue 25, Articles (25xxxx)

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Appl. Phys. Lett. 92, 254102 (2008); http://dx.doi.org/10.1063/1.2945893 (3 pages)

M. Trinker, S. Groth, S. Haslinger, S. Manz, T. Betz, S. Schneider, I. Bar-Joseph, T. Schumm, and J. Schmiedmayer
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Effect of stress on the transformation of Ni2Si into NiSi

Dominique Mangelinck and Khalid Hoummada

Appl. Phys. Lett. 92, 254101 (2008); http://dx.doi.org/10.1063/1.2949751 (3 pages) | Cited 6 times

Online Publication Date: 23 June 2008

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In situ isothermal x-ray diffraction were performed on Ni/a-Si and Ni(5%Pt)/(100)Si. In the Ni/a-Si samples, there is a time delay between the formation of NiSi and the end of the growth of Ni2Si. In the Ni(5%Pt)/(100)Si, the growth of the NiSi phase is accelerated after a time delay. The time delay is related to the strain relaxation in Ni2Si; i.e., the growth of NiSi starts (pure Ni case) or is accelerated [Ni(Pt) case] when most of the strain in Ni2Si is relaxed. This shows that the intrinsic stress associated with the growth of silicide influence the reactive diffusion.
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64.70.kd Metals and alloys
66.30.Fq Self-diffusion in metals, semimetals, and alloys
62.20.-x Mechanical properties of solids
81.20.-n Methods of materials synthesis and materials processing

Multilayer atom chips for versatile atom micromanipulation

M. Trinker, S. Groth, S. Haslinger, S. Manz, T. Betz, S. Schneider, I. Bar-Joseph, T. Schumm, and J. Schmiedmayer

Appl. Phys. Lett. 92, 254102 (2008); http://dx.doi.org/10.1063/1.2945893 (3 pages) | Cited 19 times

Online Publication Date: 24 June 2008

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We employ a combination of optical and electron-beam lithography to create an atom chip combining submicron wire structures with larger conventional wires on a single substrate. The multilayer fabrication enables crossed wire configurations, greatly enhancing the flexibility in designing potentials for ultracold quantum gases and Bose–Einstein condensates. Large current densities of >6×107 A/cm2 and high voltages of up to 65 V across 0.3 μm gaps are supported by even the smallest wire structures. We experimentally demonstrate the flexibility of the next generation atom chip by producing Bose–Einstein condensates in magnetic traps created by a combination of wires involving all different fabrication methods and structure sizes.
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03.75.Be Atom and neutron optics
03.75.Nt Other Bose-Einstein condensation phenomena
05.30.Jp Boson systems
37.10.Vz Mechanical effects of light on atoms, molecules, and ions

Biosensing using split-ring resonators at microwave regime

Hee-Jo Lee and Jong-Gwan Yook

Appl. Phys. Lett. 92, 254103 (2008); http://dx.doi.org/10.1063/1.2946656 (3 pages) | Cited 20 times

Online Publication Date: 27 June 2008

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A split-ring resonator (SRR) array is experimentally demonstrated for a biosensing device at microwave frequencies. Each SRR in the array is excited by a time-varying H-field component through a microstrip transmission line in which microwaves propagate in the quasitransverse electromagnetic mode. It is found that the resonant frequency changes due to the binding of biotin and streptavidin onto the surface of the SRRs. The observed change values represent around ΔfB = 120 MHz and ΔfB-S = 40 MHz, respectively. Finally, the SRR-based biosensing device suggests a few improvements for increasing sensitivity and describes its possible application.
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87.85.fk Biosensors
84.40.Az Waveguides, transmission lines, striplines
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